Merge tag 'drm-for-v4.11-less-shouty' of git://people.freedesktop.org/~airlied/linux

Pull drm updates from Dave Airlie:
 "This is the main drm pull request for v4.11.

  Nothing too major, the tinydrm and mmu-less support should make
  writing smaller drivers easier for some of the simpler platforms, and
  there are a bunch of documentation updates.

  Intel grew displayport MST audio support which is hopefully useful to
  people, and FBC is on by default for GEN9+ (so people know where to
  look for regressions). AMDGPU has a lot of fixes that would like new
  firmware files installed for some GPUs.

  Other than that it's pretty scattered all over.

  I may have a follow up pull request as I know BenH has a bunch of AST
  rework and fixes and I'd like to get those in once they've been tested
  by AST, and I've got at least one pull request I'm just trying to get
  the author to fix up.

  Core:
   - drm_mm reworked
   - Connector list locking and iterators
   - Documentation updates
   - Format handling rework
   - MMU-less support for fbdev helpers
   - drm_crtc_from_index helper
   - Core CRC API
   - Remove drm_framebuffer_unregister_private
   - Debugfs cleanup
   - EDID/Infoframe fixes
   - Release callback
   - Tinydrm support (smaller drivers for simple hw)

  panel:
   - Add support for some new simple panels

  i915:
   - FBC by default for gen9+
   - Shared dpll cleanups and docs
   - GEN8 powerdomain cleanup
   - DMC support on GLK
   - DP MST audio support
   - HuC loading support
   - GVT init ordering fixes
   - GVT IOMMU workaround fix

  amdgpu/radeon:
   - Power/clockgating improvements
   - Preliminary SR-IOV support
   - TTM buffer priority and eviction fixes
   - SI DPM quirks removed due to firmware fixes
   - Powerplay improvements
   - VCE/UVD powergating fixes
   - Cleanup SI GFX code to match CI/VI
   - Support for > 2 displays on 3/5 crtc asics
   - SI headless fixes

  nouveau:
   - Rework securre boot code in prep for GP10x secure boot
   - Channel recovery improvements
   - Initial power budget code
   - MMU rework preperation

  vmwgfx:
   - Bunch of fixes and cleanups

  exynos:
   - Runtime PM support for MIC driver
   - Cleanups to use atomic helpers
   - UHD Support for TM2/TM2E boards
   - Trigger mode fix for Rinato board

  etnaviv:
   - Shader performance fix
   - Command stream validator fixes
   - Command buffer suballocator

  rockchip:
   - CDN DisplayPort support
   - IOMMU support for arm64 platform

  imx-drm:
   - Fix i.MX5 TV encoder probing
   - Remove lower fb size limits

  msm:
   - Support for HW cursor on MDP5 devices
   - DSI encoder cleanup
   - GPU DT bindings cleanup

  sti:
   - stih410 cleanups
   - Create fbdev at binding
   - HQVDP fixes
   - Remove stih416 chip functionality
   - DVI/HDMI mode selection fixes
   - FPS statistic reporting

  omapdrm:
   - IRQ code cleanup

  dwi-hdmi bridge:
   - Cleanups and fixes

  adv-bridge:
   - Updates for nexus

  sii8520 bridge:
   - Add interlace mode support
   - Rework HDMI and lots of fixes

  qxl:
   - probing/teardown cleanups

  ZTE drm:
   - HDMI audio via SPDIF interface
   - Video Layer overlay plane support
   - Add TV encoder output device

  atmel-hlcdc:
   - Rework fbdev creation logic

  tegra:
   - OF node fix

  fsl-dcu:
   - Minor fixes

  mali-dp:
   - Assorted fixes

  sunxi:
   - Minor fix"

[ This was the "fixed" pull, that still had build warnings due to people
  not even having build tested the result. I'm not a happy camper

  I've fixed the things I noticed up in this merge.      - Linus ]

* tag 'drm-for-v4.11-less-shouty' of git://people.freedesktop.org/~airlied/linux: (1177 commits)
  lib/Kconfig: make PRIME_NUMBERS not user selectable
  drm/tinydrm: helpers: Properly fix backlight dependency
  drm/tinydrm: mipi-dbi: Fix field width specifier warning
  drm/tinydrm: mipi-dbi: Silence: ‘cmd’ may be used uninitialized
  drm/sti: fix build warnings in sti_drv.c and sti_vtg.c files
  drm/amd/powerplay: fix PSI feature on Polars12
  drm/amdgpu: refuse to reserve io mem for split VRAM buffers
  drm/ttm: fix use-after-free races in vm fault handling
  drm/tinydrm: Add support for Multi-Inno MI0283QT display
  dt-bindings: Add Multi-Inno MI0283QT binding
  dt-bindings: display/panel: Add common rotation property
  of: Add vendor prefix for Multi-Inno
  drm/tinydrm: Add MIPI DBI support
  drm/tinydrm: Add helper functions
  drm: Add DRM support for tiny LCD displays
  drm/amd/amdgpu: post card if there is real hw resetting performed
  drm/nouveau/tmr: provide backtrace when a timeout is hit
  drm/nouveau/pci/g92: Fix rearm
  drm/nouveau/drm/therm/fan: add a fallback if no fan control is specified in the vbios
  drm/nouveau/hwmon: expose power_max and power_crit
  ..

8 files changed, 2385 insertions, 0 deletions

diff --git a/drivers/gpu/drm/tinydrm/Kconfig b/drivers/gpu/drm/tinydrm/Kconfig
new file mode 100644
index 000000000000..3504c53846da
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/Kconfig
@@ -0,0 +1,21 @@
+menuconfig DRM_TINYDRM
+	tristate "Support for simple displays"
+	depends on DRM
+	select DRM_KMS_HELPER
+	select DRM_KMS_CMA_HELPER
+	select BACKLIGHT_LCD_SUPPORT
+	select BACKLIGHT_CLASS_DEVICE
+	help
+	  Choose this option if you have a tinydrm supported display.
+	  If M is selected the module will be called tinydrm.
+
+config TINYDRM_MIPI_DBI
+	tristate
+
+config TINYDRM_MI0283QT
+	tristate "DRM support for MI0283QT"
+	depends on DRM_TINYDRM && SPI
+	select TINYDRM_MIPI_DBI
+	help
+	  DRM driver for the Multi-Inno MI0283QT display panel
+	  If M is selected the module will be called mi0283qt.
diff --git a/drivers/gpu/drm/tinydrm/Makefile b/drivers/gpu/drm/tinydrm/Makefile
new file mode 100644
index 000000000000..7a3604cf4fc2
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/Makefile
@@ -0,0 +1,7 @@
+obj-$(CONFIG_DRM_TINYDRM)		+= core/
+
+# Controllers
+obj-$(CONFIG_TINYDRM_MIPI_DBI)		+= mipi-dbi.o
+
+# Displays
+obj-$(CONFIG_TINYDRM_MI0283QT)		+= mi0283qt.o
diff --git a/drivers/gpu/drm/tinydrm/core/Makefile b/drivers/gpu/drm/tinydrm/core/Makefile
new file mode 100644
index 000000000000..fb221e6f8885
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/core/Makefile
@@ -0,0 +1,3 @@
+tinydrm-y := tinydrm-core.o tinydrm-pipe.o tinydrm-helpers.o
+
+obj-$(CONFIG_DRM_TINYDRM) += tinydrm.o
diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-core.c b/drivers/gpu/drm/tinydrm/core/tinydrm-core.c
new file mode 100644
index 000000000000..6a257dd08ee0
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/core/tinydrm-core.c
@@ -0,0 +1,376 @@
+/*
+ * Copyright (C) 2016 Noralf Trønnes
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/tinydrm/tinydrm.h>
+#include <linux/device.h>
+#include <linux/dma-buf.h>
+
+/**
+ * DOC: overview
+ *
+ * This library provides driver helpers for very simple display hardware.
+ *
+ * It is based on &drm_simple_display_pipe coupled with a &drm_connector which
+ * has only one fixed &drm_display_mode. The framebuffers are backed by the
+ * cma helper and have support for framebuffer flushing (dirty).
+ * fbdev support is also included.
+ *
+ */
+
+/**
+ * DOC: core
+ *
+ * The driver allocates &tinydrm_device, initializes it using
+ * devm_tinydrm_init(), sets up the pipeline using tinydrm_display_pipe_init()
+ * and registers the DRM device using devm_tinydrm_register().
+ */
+
+/**
+ * tinydrm_lastclose - DRM lastclose helper
+ * @drm: DRM device
+ *
+ * This function ensures that fbdev is restored when drm_lastclose() is called
+ * on the last drm_release(). Drivers can use this as their
+ * &drm_driver->lastclose callback.
+ */
+void tinydrm_lastclose(struct drm_device *drm)
+{
+	struct tinydrm_device *tdev = drm->dev_private;
+
+	DRM_DEBUG_KMS("\n");
+	drm_fbdev_cma_restore_mode(tdev->fbdev_cma);
+}
+EXPORT_SYMBOL(tinydrm_lastclose);
+
+/**
+ * tinydrm_gem_cma_prime_import_sg_table - Produce a CMA GEM object from
+ *     another driver's scatter/gather table of pinned pages
+ * @drm: DRM device to import into
+ * @attach: DMA-BUF attachment
+ * @sgt: Scatter/gather table of pinned pages
+ *
+ * This function imports a scatter/gather table exported via DMA-BUF by
+ * another driver using drm_gem_cma_prime_import_sg_table(). It sets the
+ * kernel virtual address on the CMA object. Drivers should use this as their
+ * &drm_driver->gem_prime_import_sg_table callback if they need the virtual
+ * address. tinydrm_gem_cma_free_object() should be used in combination with
+ * this function.
+ *
+ * Returns:
+ * A pointer to a newly created GEM object or an ERR_PTR-encoded negative
+ * error code on failure.
+ */
+struct drm_gem_object *
+tinydrm_gem_cma_prime_import_sg_table(struct drm_device *drm,
+				      struct dma_buf_attachment *attach,
+				      struct sg_table *sgt)
+{
+	struct drm_gem_cma_object *cma_obj;
+	struct drm_gem_object *obj;
+	void *vaddr;
+
+	vaddr = dma_buf_vmap(attach->dmabuf);
+	if (!vaddr) {
+		DRM_ERROR("Failed to vmap PRIME buffer\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	obj = drm_gem_cma_prime_import_sg_table(drm, attach, sgt);
+	if (IS_ERR(obj)) {
+		dma_buf_vunmap(attach->dmabuf, vaddr);
+		return obj;
+	}
+
+	cma_obj = to_drm_gem_cma_obj(obj);
+	cma_obj->vaddr = vaddr;
+
+	return obj;
+}
+EXPORT_SYMBOL(tinydrm_gem_cma_prime_import_sg_table);
+
+/**
+ * tinydrm_gem_cma_free_object - Free resources associated with a CMA GEM
+ *                               object
+ * @gem_obj: GEM object to free
+ *
+ * This function frees the backing memory of the CMA GEM object, cleans up the
+ * GEM object state and frees the memory used to store the object itself using
+ * drm_gem_cma_free_object(). It also handles PRIME buffers which has the kernel
+ * virtual address set by tinydrm_gem_cma_prime_import_sg_table(). Drivers
+ * can use this as their &drm_driver->gem_free_object callback.
+ */
+void tinydrm_gem_cma_free_object(struct drm_gem_object *gem_obj)
+{
+	if (gem_obj->import_attach) {
+		struct drm_gem_cma_object *cma_obj;
+
+		cma_obj = to_drm_gem_cma_obj(gem_obj);
+		dma_buf_vunmap(gem_obj->import_attach->dmabuf, cma_obj->vaddr);
+		cma_obj->vaddr = NULL;
+	}
+
+	drm_gem_cma_free_object(gem_obj);
+}
+EXPORT_SYMBOL_GPL(tinydrm_gem_cma_free_object);
+
+const struct file_operations tinydrm_fops = {
+	.owner		= THIS_MODULE,
+	.open		= drm_open,
+	.release	= drm_release,
+	.unlocked_ioctl	= drm_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= drm_compat_ioctl,
+#endif
+	.poll		= drm_poll,
+	.read		= drm_read,
+	.llseek		= no_llseek,
+	.mmap		= drm_gem_cma_mmap,
+};
+EXPORT_SYMBOL(tinydrm_fops);
+
+static struct drm_framebuffer *
+tinydrm_fb_create(struct drm_device *drm, struct drm_file *file_priv,
+		  const struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	struct tinydrm_device *tdev = drm->dev_private;
+
+	return drm_fb_cma_create_with_funcs(drm, file_priv, mode_cmd,
+					    tdev->fb_funcs);
+}
+
+static const struct drm_mode_config_funcs tinydrm_mode_config_funcs = {
+	.fb_create = tinydrm_fb_create,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static int tinydrm_init(struct device *parent, struct tinydrm_device *tdev,
+			const struct drm_framebuffer_funcs *fb_funcs,
+			struct drm_driver *driver)
+{
+	struct drm_device *drm;
+
+	mutex_init(&tdev->dirty_lock);
+	tdev->fb_funcs = fb_funcs;
+
+	/*
+	 * We don't embed drm_device, because that prevent us from using
+	 * devm_kzalloc() to allocate tinydrm_device in the driver since
+	 * drm_dev_unref() frees the structure. The devm_ functions provide
+	 * for easy error handling.
+	 */
+	drm = drm_dev_alloc(driver, parent);
+	if (IS_ERR(drm))
+		return PTR_ERR(drm);
+
+	tdev->drm = drm;
+	drm->dev_private = tdev;
+	drm_mode_config_init(drm);
+	drm->mode_config.funcs = &tinydrm_mode_config_funcs;
+
+	return 0;
+}
+
+static void tinydrm_fini(struct tinydrm_device *tdev)
+{
+	drm_mode_config_cleanup(tdev->drm);
+	mutex_destroy(&tdev->dirty_lock);
+	tdev->drm->dev_private = NULL;
+	drm_dev_unref(tdev->drm);
+}
+
+static void devm_tinydrm_release(void *data)
+{
+	tinydrm_fini(data);
+}
+
+/**
+ * devm_tinydrm_init - Initialize tinydrm device
+ * @parent: Parent device object
+ * @tdev: tinydrm device
+ * @fb_funcs: Framebuffer functions
+ * @driver: DRM driver
+ *
+ * This function initializes @tdev, the underlying DRM device and it's
+ * mode_config. Resources will be automatically freed on driver detach (devres)
+ * using drm_mode_config_cleanup() and drm_dev_unref().
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int devm_tinydrm_init(struct device *parent, struct tinydrm_device *tdev,
+		      const struct drm_framebuffer_funcs *fb_funcs,
+		      struct drm_driver *driver)
+{
+	int ret;
+
+	ret = tinydrm_init(parent, tdev, fb_funcs, driver);
+	if (ret)
+		return ret;
+
+	ret = devm_add_action(parent, devm_tinydrm_release, tdev);
+	if (ret)
+		tinydrm_fini(tdev);
+
+	return ret;
+}
+EXPORT_SYMBOL(devm_tinydrm_init);
+
+static int tinydrm_register(struct tinydrm_device *tdev)
+{
+	struct drm_device *drm = tdev->drm;
+	int bpp = drm->mode_config.preferred_depth;
+	struct drm_fbdev_cma *fbdev;
+	int ret;
+
+	ret = drm_dev_register(tdev->drm, 0);
+	if (ret)
+		return ret;
+
+	fbdev = drm_fbdev_cma_init_with_funcs(drm, bpp ? bpp : 32,
+					      drm->mode_config.num_connector,
+					      tdev->fb_funcs);
+	if (IS_ERR(fbdev))
+		DRM_ERROR("Failed to initialize fbdev: %ld\n", PTR_ERR(fbdev));
+	else
+		tdev->fbdev_cma = fbdev;
+
+	return 0;
+}
+
+static void tinydrm_unregister(struct tinydrm_device *tdev)
+{
+	struct drm_fbdev_cma *fbdev_cma = tdev->fbdev_cma;
+
+	drm_crtc_force_disable_all(tdev->drm);
+	/* don't restore fbdev in lastclose, keep pipeline disabled */
+	tdev->fbdev_cma = NULL;
+	drm_dev_unregister(tdev->drm);
+	if (fbdev_cma)
+		drm_fbdev_cma_fini(fbdev_cma);
+}
+
+static void devm_tinydrm_register_release(void *data)
+{
+	tinydrm_unregister(data);
+}
+
+/**
+ * devm_tinydrm_register - Register tinydrm device
+ * @tdev: tinydrm device
+ *
+ * This function registers the underlying DRM device and fbdev.
+ * These resources will be automatically unregistered on driver detach (devres)
+ * and the display pipeline will be disabled.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int devm_tinydrm_register(struct tinydrm_device *tdev)
+{
+	struct device *dev = tdev->drm->dev;
+	int ret;
+
+	ret = tinydrm_register(tdev);
+	if (ret)
+		return ret;
+
+	ret = devm_add_action(dev, devm_tinydrm_register_release, tdev);
+	if (ret)
+		tinydrm_unregister(tdev);
+
+	return ret;
+}
+EXPORT_SYMBOL(devm_tinydrm_register);
+
+/**
+ * tinydrm_shutdown - Shutdown tinydrm
+ * @tdev: tinydrm device
+ *
+ * This function makes sure that the display pipeline is disabled.
+ * Used by drivers in their shutdown callback to turn off the display
+ * on machine shutdown and reboot.
+ */
+void tinydrm_shutdown(struct tinydrm_device *tdev)
+{
+	drm_crtc_force_disable_all(tdev->drm);
+}
+EXPORT_SYMBOL(tinydrm_shutdown);
+
+/**
+ * tinydrm_suspend - Suspend tinydrm
+ * @tdev: tinydrm device
+ *
+ * Used in driver PM operations to suspend tinydrm.
+ * Suspends fbdev and DRM.
+ * Resume with tinydrm_resume().
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int tinydrm_suspend(struct tinydrm_device *tdev)
+{
+	struct drm_atomic_state *state;
+
+	if (tdev->suspend_state) {
+		DRM_ERROR("Failed to suspend: state already set\n");
+		return -EINVAL;
+	}
+
+	drm_fbdev_cma_set_suspend_unlocked(tdev->fbdev_cma, 1);
+	state = drm_atomic_helper_suspend(tdev->drm);
+	if (IS_ERR(state)) {
+		drm_fbdev_cma_set_suspend_unlocked(tdev->fbdev_cma, 0);
+		return PTR_ERR(state);
+	}
+
+	tdev->suspend_state = state;
+
+	return 0;
+}
+EXPORT_SYMBOL(tinydrm_suspend);
+
+/**
+ * tinydrm_resume - Resume tinydrm
+ * @tdev: tinydrm device
+ *
+ * Used in driver PM operations to resume tinydrm.
+ * Suspend with tinydrm_suspend().
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int tinydrm_resume(struct tinydrm_device *tdev)
+{
+	struct drm_atomic_state *state = tdev->suspend_state;
+	int ret;
+
+	if (!state) {
+		DRM_ERROR("Failed to resume: state is not set\n");
+		return -EINVAL;
+	}
+
+	tdev->suspend_state = NULL;
+
+	ret = drm_atomic_helper_resume(tdev->drm, state);
+	if (ret) {
+		DRM_ERROR("Error resuming state: %d\n", ret);
+		return ret;
+	}
+
+	drm_fbdev_cma_set_suspend_unlocked(tdev->fbdev_cma, 0);
+
+	return 0;
+}
+EXPORT_SYMBOL(tinydrm_resume);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
new file mode 100644
index 000000000000..3ccda6c1e159
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
@@ -0,0 +1,460 @@
+/*
+ * Copyright (C) 2016 Noralf Trønnes
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <drm/tinydrm/tinydrm.h>
+#include <drm/tinydrm/tinydrm-helpers.h>
+#include <linux/backlight.h>
+#include <linux/pm.h>
+#include <linux/spi/spi.h>
+#include <linux/swab.h>
+
+static unsigned int spi_max;
+module_param(spi_max, uint, 0400);
+MODULE_PARM_DESC(spi_max, "Set a lower SPI max transfer size");
+
+/**
+ * tinydrm_merge_clips - Merge clip rectangles
+ * @dst: Destination clip rectangle
+ * @src: Source clip rectangle(s)
+ * @num_clips: Number of @src clip rectangles
+ * @flags: Dirty fb ioctl flags
+ * @max_width: Maximum width of @dst
+ * @max_height: Maximum height of @dst
+ *
+ * This function merges @src clip rectangle(s) into @dst. If @src is NULL,
+ * @max_width and @min_width is used to set a full @dst clip rectangle.
+ *
+ * Returns:
+ * true if it's a full clip, false otherwise
+ */
+bool tinydrm_merge_clips(struct drm_clip_rect *dst,
+			 struct drm_clip_rect *src, unsigned int num_clips,
+			 unsigned int flags, u32 max_width, u32 max_height)
+{
+	unsigned int i;
+
+	if (!src || !num_clips) {
+		dst->x1 = 0;
+		dst->x2 = max_width;
+		dst->y1 = 0;
+		dst->y2 = max_height;
+		return true;
+	}
+
+	dst->x1 = ~0;
+	dst->y1 = ~0;
+	dst->x2 = 0;
+	dst->y2 = 0;
+
+	for (i = 0; i < num_clips; i++) {
+		if (flags & DRM_MODE_FB_DIRTY_ANNOTATE_COPY)
+			i++;
+		dst->x1 = min(dst->x1, src[i].x1);
+		dst->x2 = max(dst->x2, src[i].x2);
+		dst->y1 = min(dst->y1, src[i].y1);
+		dst->y2 = max(dst->y2, src[i].y2);
+	}
+
+	if (dst->x2 > max_width || dst->y2 > max_height ||
+	    dst->x1 >= dst->x2 || dst->y1 >= dst->y2) {
+		DRM_DEBUG_KMS("Illegal clip: x1=%u, x2=%u, y1=%u, y2=%u\n",
+			      dst->x1, dst->x2, dst->y1, dst->y2);
+		dst->x1 = 0;
+		dst->y1 = 0;
+		dst->x2 = max_width;
+		dst->y2 = max_height;
+	}
+
+	return (dst->x2 - dst->x1) == max_width &&
+	       (dst->y2 - dst->y1) == max_height;
+}
+EXPORT_SYMBOL(tinydrm_merge_clips);
+
+/**
+ * tinydrm_memcpy - Copy clip buffer
+ * @dst: Destination buffer
+ * @vaddr: Source buffer
+ * @fb: DRM framebuffer
+ * @clip: Clip rectangle area to copy
+ */
+void tinydrm_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb,
+		    struct drm_clip_rect *clip)
+{
+	unsigned int cpp = drm_format_plane_cpp(fb->format->format, 0);
+	unsigned int pitch = fb->pitches[0];
+	void *src = vaddr + (clip->y1 * pitch) + (clip->x1 * cpp);
+	size_t len = (clip->x2 - clip->x1) * cpp;
+	unsigned int y;
+
+	for (y = clip->y1; y < clip->y2; y++) {
+		memcpy(dst, src, len);
+		src += pitch;
+		dst += len;
+	}
+}
+EXPORT_SYMBOL(tinydrm_memcpy);
+
+/**
+ * tinydrm_swab16 - Swap bytes into clip buffer
+ * @dst: RGB565 destination buffer
+ * @vaddr: RGB565 source buffer
+ * @fb: DRM framebuffer
+ * @clip: Clip rectangle area to copy
+ */
+void tinydrm_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
+		    struct drm_clip_rect *clip)
+{
+	size_t len = (clip->x2 - clip->x1) * sizeof(u16);
+	unsigned int x, y;
+	u16 *src, *buf;
+
+	/*
+	 * The cma memory is write-combined so reads are uncached.
+	 * Speed up by fetching one line at a time.
+	 */
+	buf = kmalloc(len, GFP_KERNEL);
+	if (!buf)
+		return;
+
+	for (y = clip->y1; y < clip->y2; y++) {
+		src = vaddr + (y * fb->pitches[0]);
+		src += clip->x1;
+		memcpy(buf, src, len);
+		src = buf;
+		for (x = clip->x1; x < clip->x2; x++)
+			*dst++ = swab16(*src++);
+	}
+
+	kfree(buf);
+}
+EXPORT_SYMBOL(tinydrm_swab16);
+
+/**
+ * tinydrm_xrgb8888_to_rgb565 - Convert XRGB8888 to RGB565 clip buffer
+ * @dst: RGB565 destination buffer
+ * @vaddr: XRGB8888 source buffer
+ * @fb: DRM framebuffer
+ * @clip: Clip rectangle area to copy
+ * @swap: Swap bytes
+ *
+ * Drivers can use this function for RGB565 devices that don't natively
+ * support XRGB8888.
+ */
+void tinydrm_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
+				struct drm_framebuffer *fb,
+				struct drm_clip_rect *clip, bool swap)
+{
+	size_t len = (clip->x2 - clip->x1) * sizeof(u32);
+	unsigned int x, y;
+	u32 *src, *buf;
+	u16 val16;
+
+	buf = kmalloc(len, GFP_KERNEL);
+	if (!buf)
+		return;
+
+	for (y = clip->y1; y < clip->y2; y++) {
+		src = vaddr + (y * fb->pitches[0]);
+		src += clip->x1;
+		memcpy(buf, src, len);
+		src = buf;
+		for (x = clip->x1; x < clip->x2; x++) {
+			val16 = ((*src & 0x00F80000) >> 8) |
+				((*src & 0x0000FC00) >> 5) |
+				((*src & 0x000000F8) >> 3);
+			src++;
+			if (swap)
+				*dst++ = swab16(val16);
+			else
+				*dst++ = val16;
+		}
+	}
+
+	kfree(buf);
+}
+EXPORT_SYMBOL(tinydrm_xrgb8888_to_rgb565);
+
+/**
+ * tinydrm_of_find_backlight - Find backlight device in device-tree
+ * @dev: Device
+ *
+ * This function looks for a DT node pointed to by a property named 'backlight'
+ * and uses of_find_backlight_by_node() to get the backlight device.
+ * Additionally if the brightness property is zero, it is set to
+ * max_brightness.
+ *
+ * Returns:
+ * NULL if there's no backlight property.
+ * Error pointer -EPROBE_DEFER if the DT node is found, but no backlight device
+ * is found.
+ * If the backlight device is found, a pointer to the structure is returned.
+ */
+struct backlight_device *tinydrm_of_find_backlight(struct device *dev)
+{
+	struct backlight_device *backlight;
+	struct device_node *np;
+
+	np = of_parse_phandle(dev->of_node, "backlight", 0);
+	if (!np)
+		return NULL;
+
+	backlight = of_find_backlight_by_node(np);
+	of_node_put(np);
+
+	if (!backlight)
+		return ERR_PTR(-EPROBE_DEFER);
+
+	if (!backlight->props.brightness) {
+		backlight->props.brightness = backlight->props.max_brightness;
+		DRM_DEBUG_KMS("Backlight brightness set to %d\n",
+			      backlight->props.brightness);
+	}
+
+	return backlight;
+}
+EXPORT_SYMBOL(tinydrm_of_find_backlight);
+
+/**
+ * tinydrm_enable_backlight - Enable backlight helper
+ * @backlight: Backlight device
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int tinydrm_enable_backlight(struct backlight_device *backlight)
+{
+	unsigned int old_state;
+	int ret;
+
+	if (!backlight)
+		return 0;
+
+	old_state = backlight->props.state;
+	backlight->props.state &= ~BL_CORE_FBBLANK;
+	DRM_DEBUG_KMS("Backlight state: 0x%x -> 0x%x\n", old_state,
+		      backlight->props.state);
+
+	ret = backlight_update_status(backlight);
+	if (ret)
+		DRM_ERROR("Failed to enable backlight %d\n", ret);
+
+	return ret;
+}
+EXPORT_SYMBOL(tinydrm_enable_backlight);
+
+/**
+ * tinydrm_disable_backlight - Disable backlight helper
+ * @backlight: Backlight device
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int tinydrm_disable_backlight(struct backlight_device *backlight)
+{
+	unsigned int old_state;
+	int ret;
+
+	if (!backlight)
+		return 0;
+
+	old_state = backlight->props.state;
+	backlight->props.state |= BL_CORE_FBBLANK;
+	DRM_DEBUG_KMS("Backlight state: 0x%x -> 0x%x\n", old_state,
+		      backlight->props.state);
+	ret = backlight_update_status(backlight);
+	if (ret)
+		DRM_ERROR("Failed to disable backlight %d\n", ret);
+
+	return ret;
+}
+EXPORT_SYMBOL(tinydrm_disable_backlight);
+
+#if IS_ENABLED(CONFIG_SPI)
+
+/**
+ * tinydrm_spi_max_transfer_size - Determine max SPI transfer size
+ * @spi: SPI device
+ * @max_len: Maximum buffer size needed (optional)
+ *
+ * This function returns the maximum size to use for SPI transfers. It checks
+ * the SPI master, the optional @max_len and the module parameter spi_max and
+ * returns the smallest.
+ *
+ * Returns:
+ * Maximum size for SPI transfers
+ */
+size_t tinydrm_spi_max_transfer_size(struct spi_device *spi, size_t max_len)
+{
+	size_t ret;
+
+	ret = min(spi_max_transfer_size(spi), spi->master->max_dma_len);
+	if (max_len)
+		ret = min(ret, max_len);
+	if (spi_max)
+		ret = min_t(size_t, ret, spi_max);
+	ret &= ~0x3;
+	if (ret < 4)
+		ret = 4;
+
+	return ret;
+}
+EXPORT_SYMBOL(tinydrm_spi_max_transfer_size);
+
+/**
+ * tinydrm_spi_bpw_supported - Check if bits per word is supported
+ * @spi: SPI device
+ * @bpw: Bits per word
+ *
+ * This function checks to see if the SPI master driver supports @bpw.
+ *
+ * Returns:
+ * True if @bpw is supported, false otherwise.
+ */
+bool tinydrm_spi_bpw_supported(struct spi_device *spi, u8 bpw)
+{
+	u32 bpw_mask = spi->master->bits_per_word_mask;
+
+	if (bpw == 8)
+		return true;
+
+	if (!bpw_mask) {
+		dev_warn_once(&spi->dev,
+			      "bits_per_word_mask not set, assume 8-bit only\n");
+		return false;
+	}
+
+	if (bpw_mask & SPI_BPW_MASK(bpw))
+		return true;
+
+	return false;
+}
+EXPORT_SYMBOL(tinydrm_spi_bpw_supported);
+
+static void
+tinydrm_dbg_spi_print(struct spi_device *spi, struct spi_transfer *tr,
+		      const void *buf, int idx, bool tx)
+{
+	u32 speed_hz = tr->speed_hz ? tr->speed_hz : spi->max_speed_hz;
+	char linebuf[3 * 32];
+
+	hex_dump_to_buffer(buf, tr->len, 16,
+			   DIV_ROUND_UP(tr->bits_per_word, 8),
+			   linebuf, sizeof(linebuf), false);
+
+	printk(KERN_DEBUG
+	       "    tr(%i): speed=%u%s, bpw=%i, len=%u, %s_buf=[%s%s]\n", idx,
+	       speed_hz > 1000000 ? speed_hz / 1000000 : speed_hz / 1000,
+	       speed_hz > 1000000 ? "MHz" : "kHz", tr->bits_per_word, tr->len,
+	       tx ? "tx" : "rx", linebuf, tr->len > 16 ? " ..." : "");
+}
+
+/* called through tinydrm_dbg_spi_message() */
+void _tinydrm_dbg_spi_message(struct spi_device *spi, struct spi_message *m)
+{
+	struct spi_transfer *tmp;
+	struct list_head *pos;
+	int i = 0;
+
+	list_for_each(pos, &m->transfers) {
+		tmp = list_entry(pos, struct spi_transfer, transfer_list);
+
+		if (tmp->tx_buf)
+			tinydrm_dbg_spi_print(spi, tmp, tmp->tx_buf, i, true);
+		if (tmp->rx_buf)
+			tinydrm_dbg_spi_print(spi, tmp, tmp->rx_buf, i, false);
+		i++;
+	}
+}
+EXPORT_SYMBOL(_tinydrm_dbg_spi_message);
+
+/**
+ * tinydrm_spi_transfer - SPI transfer helper
+ * @spi: SPI device
+ * @speed_hz: Override speed (optional)
+ * @header: Optional header transfer
+ * @bpw: Bits per word
+ * @buf: Buffer to transfer
+ * @len: Buffer length
+ *
+ * This SPI transfer helper breaks up the transfer of @buf into chunks which
+ * the SPI master driver can handle. If the machine is Little Endian and the
+ * SPI master driver doesn't support 16 bits per word, it swaps the bytes and
+ * does a 8-bit transfer.
+ * If @header is set, it is prepended to each SPI message.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int tinydrm_spi_transfer(struct spi_device *spi, u32 speed_hz,
+			 struct spi_transfer *header, u8 bpw, const void *buf,
+			 size_t len)
+{
+	struct spi_transfer tr = {
+		.bits_per_word = bpw,
+		.speed_hz = speed_hz,
+	};
+	struct spi_message m;
+	u16 *swap_buf = NULL;
+	size_t max_chunk;
+	size_t chunk;
+	int ret = 0;
+
+	if (WARN_ON_ONCE(bpw != 8 && bpw != 16))
+		return -EINVAL;
+
+	max_chunk = tinydrm_spi_max_transfer_size(spi, 0);
+
+	if (drm_debug & DRM_UT_DRIVER)
+		pr_debug("[drm:%s] bpw=%u, max_chunk=%zu, transfers:\n",
+			 __func__, bpw, max_chunk);
+
+	if (bpw == 16 && !tinydrm_spi_bpw_supported(spi, 16)) {
+		tr.bits_per_word = 8;
+		if (tinydrm_machine_little_endian()) {
+			swap_buf = kmalloc(min(len, max_chunk), GFP_KERNEL);
+			if (!swap_buf)
+				return -ENOMEM;
+		}
+	}
+
+	spi_message_init(&m);
+	if (header)
+		spi_message_add_tail(header, &m);
+	spi_message_add_tail(&tr, &m);
+
+	while (len) {
+		chunk = min(len, max_chunk);
+
+		tr.tx_buf = buf;
+		tr.len = chunk;
+
+		if (swap_buf) {
+			const u16 *buf16 = buf;
+			unsigned int i;
+
+			for (i = 0; i < chunk / 2; i++)
+				swap_buf[i] = swab16(buf16[i]);
+
+			tr.tx_buf = swap_buf;
+		}
+
+		buf += chunk;
+		len -= chunk;
+
+		tinydrm_dbg_spi_message(spi, &m);
+		ret = spi_sync(spi, &m);
+		if (ret)
+			return ret;
+	};
+
+	return 0;
+}
+EXPORT_SYMBOL(tinydrm_spi_transfer);
+
+#endif /* CONFIG_SPI */
diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c b/drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
new file mode 100644
index 000000000000..ec43fb7ad9e4
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
@@ -0,0 +1,234 @@
+/*
+ * Copyright (C) 2016 Noralf Trønnes
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_modes.h>
+#include <drm/tinydrm/tinydrm.h>
+
+struct tinydrm_connector {
+	struct drm_connector base;
+	const struct drm_display_mode *mode;
+};
+
+static inline struct tinydrm_connector *
+to_tinydrm_connector(struct drm_connector *connector)
+{
+	return container_of(connector, struct tinydrm_connector, base);
+}
+
+static int tinydrm_connector_get_modes(struct drm_connector *connector)
+{
+	struct tinydrm_connector *tconn = to_tinydrm_connector(connector);
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(connector->dev, tconn->mode);
+	if (!mode) {
+		DRM_ERROR("Failed to duplicate mode\n");
+		return 0;
+	}
+
+	if (mode->name[0] == '\0')
+		drm_mode_set_name(mode);
+
+	mode->type |= DRM_MODE_TYPE_PREFERRED;
+	drm_mode_probed_add(connector, mode);
+
+	if (mode->width_mm) {
+		connector->display_info.width_mm = mode->width_mm;
+		connector->display_info.height_mm = mode->height_mm;
+	}
+
+	return 1;
+}
+
+static const struct drm_connector_helper_funcs tinydrm_connector_hfuncs = {
+	.get_modes = tinydrm_connector_get_modes,
+	.best_encoder = drm_atomic_helper_best_encoder,
+};
+
+static enum drm_connector_status
+tinydrm_connector_detect(struct drm_connector *connector, bool force)
+{
+	if (drm_device_is_unplugged(connector->dev))
+		return connector_status_disconnected;
+
+	return connector->status;
+}
+
+static void tinydrm_connector_destroy(struct drm_connector *connector)
+{
+	struct tinydrm_connector *tconn = to_tinydrm_connector(connector);
+
+	drm_connector_cleanup(connector);
+	kfree(tconn);
+}
+
+static const struct drm_connector_funcs tinydrm_connector_funcs = {
+	.dpms = drm_atomic_helper_connector_dpms,
+	.reset = drm_atomic_helper_connector_reset,
+	.detect = tinydrm_connector_detect,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = tinydrm_connector_destroy,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+struct drm_connector *
+tinydrm_connector_create(struct drm_device *drm,
+			 const struct drm_display_mode *mode,
+			 int connector_type)
+{
+	struct tinydrm_connector *tconn;
+	struct drm_connector *connector;
+	int ret;
+
+	tconn = kzalloc(sizeof(*tconn), GFP_KERNEL);
+	if (!tconn)
+		return ERR_PTR(-ENOMEM);
+
+	tconn->mode = mode;
+	connector = &tconn->base;
+
+	drm_connector_helper_add(connector, &tinydrm_connector_hfuncs);
+	ret = drm_connector_init(drm, connector, &tinydrm_connector_funcs,
+				 connector_type);
+	if (ret) {
+		kfree(tconn);
+		return ERR_PTR(ret);
+	}
+
+	connector->status = connector_status_connected;
+
+	return connector;
+}
+
+/**
+ * tinydrm_display_pipe_update - Display pipe update helper
+ * @pipe: Simple display pipe
+ * @old_state: Old plane state
+ *
+ * This function does a full framebuffer flush if the plane framebuffer
+ * has changed. It also handles vblank events. Drivers can use this as their
+ * &drm_simple_display_pipe_funcs->update callback.
+ */
+void tinydrm_display_pipe_update(struct drm_simple_display_pipe *pipe,
+				 struct drm_plane_state *old_state)
+{
+	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
+	struct drm_framebuffer *fb = pipe->plane.state->fb;
+	struct drm_crtc *crtc = &tdev->pipe.crtc;
+
+	if (fb && (fb != old_state->fb)) {
+		pipe->plane.fb = fb;
+		if (fb->funcs->dirty)
+			fb->funcs->dirty(fb, NULL, 0, 0, NULL, 0);
+	}
+
+	if (crtc->state->event) {
+		spin_lock_irq(&crtc->dev->event_lock);
+		drm_crtc_send_vblank_event(crtc, crtc->state->event);
+		spin_unlock_irq(&crtc->dev->event_lock);
+		crtc->state->event = NULL;
+	}
+}
+EXPORT_SYMBOL(tinydrm_display_pipe_update);
+
+/**
+ * tinydrm_display_pipe_prepare_fb - Display pipe prepare_fb helper
+ * @pipe: Simple display pipe
+ * @plane_state: Plane state
+ *
+ * This function uses drm_fb_cma_prepare_fb() to check if the plane FB has an
+ * dma-buf attached, extracts the exclusive fence and attaches it to plane
+ * state for the atomic helper to wait on. Drivers can use this as their
+ * &drm_simple_display_pipe_funcs->prepare_fb callback.
+ */
+int tinydrm_display_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
+				    struct drm_plane_state *plane_state)
+{
+	return drm_fb_cma_prepare_fb(&pipe->plane, plane_state);
+}
+EXPORT_SYMBOL(tinydrm_display_pipe_prepare_fb);
+
+static int tinydrm_rotate_mode(struct drm_display_mode *mode,
+			       unsigned int rotation)
+{
+	if (rotation == 0 || rotation == 180) {
+		return 0;
+	} else if (rotation == 90 || rotation == 270) {
+		swap(mode->hdisplay, mode->vdisplay);
+		swap(mode->hsync_start, mode->vsync_start);
+		swap(mode->hsync_end, mode->vsync_end);
+		swap(mode->htotal, mode->vtotal);
+		swap(mode->width_mm, mode->height_mm);
+		return 0;
+	} else {
+		return -EINVAL;
+	}
+}
+
+/**
+ * tinydrm_display_pipe_init - Initialize display pipe
+ * @tdev: tinydrm device
+ * @funcs: Display pipe functions
+ * @connector_type: Connector type
+ * @formats: Array of supported formats (DRM_FORMAT\_\*)
+ * @format_count: Number of elements in @formats
+ * @mode: Supported mode
+ * @rotation: Initial @mode rotation in degrees Counter Clock Wise
+ *
+ * This function sets up a &drm_simple_display_pipe with a &drm_connector that
+ * has one fixed &drm_display_mode which is rotated according to @rotation.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int
+tinydrm_display_pipe_init(struct tinydrm_device *tdev,
+			  const struct drm_simple_display_pipe_funcs *funcs,
+			  int connector_type,
+			  const uint32_t *formats,
+			  unsigned int format_count,
+			  const struct drm_display_mode *mode,
+			  unsigned int rotation)
+{
+	struct drm_device *drm = tdev->drm;
+	struct drm_display_mode *mode_copy;
+	struct drm_connector *connector;
+	int ret;
+
+	mode_copy = devm_kmalloc(drm->dev, sizeof(*mode_copy), GFP_KERNEL);
+	if (!mode_copy)
+		return -ENOMEM;
+
+	*mode_copy = *mode;
+	ret = tinydrm_rotate_mode(mode_copy, rotation);
+	if (ret) {
+		DRM_ERROR("Illegal rotation value %u\n", rotation);
+		return -EINVAL;
+	}
+
+	drm->mode_config.min_width = mode_copy->hdisplay;
+	drm->mode_config.max_width = mode_copy->hdisplay;
+	drm->mode_config.min_height = mode_copy->vdisplay;
+	drm->mode_config.max_height = mode_copy->vdisplay;
+
+	connector = tinydrm_connector_create(drm, mode_copy, connector_type);
+	if (IS_ERR(connector))
+		return PTR_ERR(connector);
+
+	ret = drm_simple_display_pipe_init(drm, &tdev->pipe, funcs, formats,
+					   format_count, connector);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+EXPORT_SYMBOL(tinydrm_display_pipe_init);
diff --git a/drivers/gpu/drm/tinydrm/mi0283qt.c b/drivers/gpu/drm/tinydrm/mi0283qt.c
new file mode 100644
index 000000000000..b29fe86158f7
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/mi0283qt.c
@@ -0,0 +1,279 @@
+/*
+ * DRM driver for Multi-Inno MI0283QT panels
+ *
+ * Copyright 2016 Noralf Trønnes
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <drm/tinydrm/ili9341.h>
+#include <drm/tinydrm/mipi-dbi.h>
+#include <drm/tinydrm/tinydrm-helpers.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+#include <video/mipi_display.h>
+
+static int mi0283qt_init(struct mipi_dbi *mipi)
+{
+	struct tinydrm_device *tdev = &mipi->tinydrm;
+	struct device *dev = tdev->drm->dev;
+	u8 addr_mode;
+	int ret;
+
+	DRM_DEBUG_KMS("\n");
+
+	ret = regulator_enable(mipi->regulator);
+	if (ret) {
+		dev_err(dev, "Failed to enable regulator %d\n", ret);
+		return ret;
+	}
+
+	/* Avoid flicker by skipping setup if the bootloader has done it */
+	if (mipi_dbi_display_is_on(mipi))
+		return 0;
+
+	mipi_dbi_hw_reset(mipi);
+	ret = mipi_dbi_command(mipi, MIPI_DCS_SOFT_RESET);
+	if (ret) {
+		dev_err(dev, "Error sending command %d\n", ret);
+		regulator_disable(mipi->regulator);
+		return ret;
+	}
+
+	msleep(20);
+
+	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
+
+	mipi_dbi_command(mipi, ILI9341_PWCTRLB, 0x00, 0x83, 0x30);
+	mipi_dbi_command(mipi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);
+	mipi_dbi_command(mipi, ILI9341_DTCTRLA, 0x85, 0x01, 0x79);
+	mipi_dbi_command(mipi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);
+	mipi_dbi_command(mipi, ILI9341_PUMPCTRL, 0x20);
+	mipi_dbi_command(mipi, ILI9341_DTCTRLB, 0x00, 0x00);
+
+	/* Power Control */
+	mipi_dbi_command(mipi, ILI9341_PWCTRL1, 0x26);
+	mipi_dbi_command(mipi, ILI9341_PWCTRL2, 0x11);
+	/* VCOM */
+	mipi_dbi_command(mipi, ILI9341_VMCTRL1, 0x35, 0x3e);
+	mipi_dbi_command(mipi, ILI9341_VMCTRL2, 0xbe);
+
+	/* Memory Access Control */
+	mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
+
+	switch (mipi->rotation) {
+	default:
+		addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
+			    ILI9341_MADCTL_MX;
+		break;
+	case 90:
+		addr_mode = ILI9341_MADCTL_MY;
+		break;
+	case 180:
+		addr_mode = ILI9341_MADCTL_MV;
+		break;
+	case 270:
+		addr_mode = ILI9341_MADCTL_MX;
+		break;
+	}
+	addr_mode |= ILI9341_MADCTL_BGR;
+	mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
+
+	/* Frame Rate */
+	mipi_dbi_command(mipi, ILI9341_FRMCTR1, 0x00, 0x1b);
+
+	/* Gamma */
+	mipi_dbi_command(mipi, ILI9341_EN3GAM, 0x08);
+	mipi_dbi_command(mipi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
+	mipi_dbi_command(mipi, ILI9341_PGAMCTRL,
+		       0x1f, 0x1a, 0x18, 0x0a, 0x0f, 0x06, 0x45, 0x87,
+		       0x32, 0x0a, 0x07, 0x02, 0x07, 0x05, 0x00);
+	mipi_dbi_command(mipi, ILI9341_NGAMCTRL,
+		       0x00, 0x25, 0x27, 0x05, 0x10, 0x09, 0x3a, 0x78,
+		       0x4d, 0x05, 0x18, 0x0d, 0x38, 0x3a, 0x1f);
+
+	/* DDRAM */
+	mipi_dbi_command(mipi, ILI9341_ETMOD, 0x07);
+
+	/* Display */
+	mipi_dbi_command(mipi, ILI9341_DISCTRL, 0x0a, 0x82, 0x27, 0x00);
+	mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
+	msleep(100);
+
+	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
+	msleep(100);
+
+	return 0;
+}
+
+static void mi0283qt_fini(void *data)
+{
+	struct mipi_dbi *mipi = data;
+
+	DRM_DEBUG_KMS("\n");
+	regulator_disable(mipi->regulator);
+}
+
+static const struct drm_simple_display_pipe_funcs mi0283qt_pipe_funcs = {
+	.enable = mipi_dbi_pipe_enable,
+	.disable = mipi_dbi_pipe_disable,
+	.update = tinydrm_display_pipe_update,
+	.prepare_fb = tinydrm_display_pipe_prepare_fb,
+};
+
+static const struct drm_display_mode mi0283qt_mode = {
+	TINYDRM_MODE(320, 240, 58, 43),
+};
+
+static struct drm_driver mi0283qt_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
+				  DRIVER_ATOMIC,
+	TINYDRM_GEM_DRIVER_OPS,
+	.lastclose		= tinydrm_lastclose,
+	.debugfs_init		= mipi_dbi_debugfs_init,
+	.name			= "mi0283qt",
+	.desc			= "Multi-Inno MI0283QT",
+	.date			= "20160614",
+	.major			= 1,
+	.minor			= 0,
+};
+
+static const struct of_device_id mi0283qt_of_match[] = {
+	{ .compatible = "multi-inno,mi0283qt" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mi0283qt_of_match);
+
+static const struct spi_device_id mi0283qt_id[] = {
+	{ "mi0283qt", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(spi, mi0283qt_id);
+
+static int mi0283qt_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct tinydrm_device *tdev;
+	struct mipi_dbi *mipi;
+	struct gpio_desc *dc;
+	u32 rotation = 0;
+	int ret;
+
+	mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
+	if (!mipi)
+		return -ENOMEM;
+
+	mipi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(mipi->reset)) {
+		dev_err(dev, "Failed to get gpio 'reset'\n");
+		return PTR_ERR(mipi->reset);
+	}
+
+	dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
+	if (IS_ERR(dc)) {
+		dev_err(dev, "Failed to get gpio 'dc'\n");
+		return PTR_ERR(dc);
+	}
+
+	mipi->regulator = devm_regulator_get(dev, "power");
+	if (IS_ERR(mipi->regulator))
+		return PTR_ERR(mipi->regulator);
+
+	mipi->backlight = tinydrm_of_find_backlight(dev);
+	if (IS_ERR(mipi->backlight))
+		return PTR_ERR(mipi->backlight);
+
+	device_property_read_u32(dev, "rotation", &rotation);
+
+	ret = mipi_dbi_spi_init(spi, mipi, dc, &mi0283qt_pipe_funcs,
+				&mi0283qt_driver, &mi0283qt_mode, rotation);
+	if (ret)
+		return ret;
+
+	ret = mi0283qt_init(mipi);
+	if (ret)
+		return ret;
+
+	/* use devres to fini after drm unregister (drv->remove is before) */
+	ret = devm_add_action(dev, mi0283qt_fini, mipi);
+	if (ret) {
+		mi0283qt_fini(mipi);
+		return ret;
+	}
+
+	tdev = &mipi->tinydrm;
+
+	ret = devm_tinydrm_register(tdev);
+	if (ret)
+		return ret;
+
+	spi_set_drvdata(spi, mipi);
+
+	DRM_DEBUG_DRIVER("Initialized %s:%s @%uMHz on minor %d\n",
+			 tdev->drm->driver->name, dev_name(dev),
+			 spi->max_speed_hz / 1000000,
+			 tdev->drm->primary->index);
+
+	return 0;
+}
+
+static void mi0283qt_shutdown(struct spi_device *spi)
+{
+	struct mipi_dbi *mipi = spi_get_drvdata(spi);
+
+	tinydrm_shutdown(&mipi->tinydrm);
+}
+
+static int __maybe_unused mi0283qt_pm_suspend(struct device *dev)
+{
+	struct mipi_dbi *mipi = dev_get_drvdata(dev);
+	int ret;
+
+	ret = tinydrm_suspend(&mipi->tinydrm);
+	if (ret)
+		return ret;
+
+	mi0283qt_fini(mipi);
+
+	return 0;
+}
+
+static int __maybe_unused mi0283qt_pm_resume(struct device *dev)
+{
+	struct mipi_dbi *mipi = dev_get_drvdata(dev);
+	int ret;
+
+	ret = mi0283qt_init(mipi);
+	if (ret)
+		return ret;
+
+	return tinydrm_resume(&mipi->tinydrm);
+}
+
+static const struct dev_pm_ops mi0283qt_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(mi0283qt_pm_suspend, mi0283qt_pm_resume)
+};
+
+static struct spi_driver mi0283qt_spi_driver = {
+	.driver = {
+		.name = "mi0283qt",
+		.owner = THIS_MODULE,
+		.of_match_table = mi0283qt_of_match,
+		.pm = &mi0283qt_pm_ops,
+	},
+	.id_table = mi0283qt_id,
+	.probe = mi0283qt_probe,
+	.shutdown = mi0283qt_shutdown,
+};
+module_spi_driver(mi0283qt_spi_driver);
+
+MODULE_DESCRIPTION("Multi-Inno MI0283QT DRM driver");
+MODULE_AUTHOR("Noralf Trønnes");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c
new file mode 100644
index 000000000000..29c0939f5247
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c
@@ -0,0 +1,1005 @@
+/*
+ * MIPI Display Bus Interface (DBI) LCD controller support
+ *
+ * Copyright 2016 Noralf Trønnes
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <drm/tinydrm/mipi-dbi.h>
+#include <drm/tinydrm/tinydrm-helpers.h>
+#include <linux/debugfs.h>
+#include <linux/dma-buf.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+#include <video/mipi_display.h>
+
+#define MIPI_DBI_MAX_SPI_READ_SPEED 2000000 /* 2MHz */
+
+#define DCS_POWER_MODE_DISPLAY			BIT(2)
+#define DCS_POWER_MODE_DISPLAY_NORMAL_MODE	BIT(3)
+#define DCS_POWER_MODE_SLEEP_MODE		BIT(4)
+#define DCS_POWER_MODE_PARTIAL_MODE		BIT(5)
+#define DCS_POWER_MODE_IDLE_MODE		BIT(6)
+#define DCS_POWER_MODE_RESERVED_MASK		(BIT(0) | BIT(1) | BIT(7))
+
+/**
+ * DOC: overview
+ *
+ * This library provides helpers for MIPI Display Bus Interface (DBI)
+ * compatible display controllers.
+ *
+ * Many controllers for tiny lcd displays are MIPI compliant and can use this
+ * library. If a controller uses registers 0x2A and 0x2B to set the area to
+ * update and uses register 0x2C to write to frame memory, it is most likely
+ * MIPI compliant.
+ *
+ * Only MIPI Type 1 displays are supported since a full frame memory is needed.
+ *
+ * There are 3 MIPI DBI implementation types:
+ *
+ * A. Motorola 6800 type parallel bus
+ *
+ * B. Intel 8080 type parallel bus
+ *
+ * C. SPI type with 3 options:
+ *
+ *    1. 9-bit with the Data/Command signal as the ninth bit
+ *    2. Same as above except it's sent as 16 bits
+ *    3. 8-bit with the Data/Command signal as a separate D/CX pin
+ *
+ * Currently mipi_dbi only supports Type C options 1 and 3 with
+ * mipi_dbi_spi_init().
+ */
+
+#define MIPI_DBI_DEBUG_COMMAND(cmd, data, len) \
+({ \
+	if (!len) \
+		DRM_DEBUG_DRIVER("cmd=%02x\n", cmd); \
+	else if (len <= 32) \
+		DRM_DEBUG_DRIVER("cmd=%02x, par=%*ph\n", cmd, (int)len, data);\
+	else \
+		DRM_DEBUG_DRIVER("cmd=%02x, len=%zu\n", cmd, len); \
+})
+
+static const u8 mipi_dbi_dcs_read_commands[] = {
+	MIPI_DCS_GET_DISPLAY_ID,
+	MIPI_DCS_GET_RED_CHANNEL,
+	MIPI_DCS_GET_GREEN_CHANNEL,
+	MIPI_DCS_GET_BLUE_CHANNEL,
+	MIPI_DCS_GET_DISPLAY_STATUS,
+	MIPI_DCS_GET_POWER_MODE,
+	MIPI_DCS_GET_ADDRESS_MODE,
+	MIPI_DCS_GET_PIXEL_FORMAT,
+	MIPI_DCS_GET_DISPLAY_MODE,
+	MIPI_DCS_GET_SIGNAL_MODE,
+	MIPI_DCS_GET_DIAGNOSTIC_RESULT,
+	MIPI_DCS_READ_MEMORY_START,
+	MIPI_DCS_READ_MEMORY_CONTINUE,
+	MIPI_DCS_GET_SCANLINE,
+	MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
+	MIPI_DCS_GET_CONTROL_DISPLAY,
+	MIPI_DCS_GET_POWER_SAVE,
+	MIPI_DCS_GET_CABC_MIN_BRIGHTNESS,
+	MIPI_DCS_READ_DDB_START,
+	MIPI_DCS_READ_DDB_CONTINUE,
+	0, /* sentinel */
+};
+
+static bool mipi_dbi_command_is_read(struct mipi_dbi *mipi, u8 cmd)
+{
+	unsigned int i;
+
+	if (!mipi->read_commands)
+		return false;
+
+	for (i = 0; i < 0xff; i++) {
+		if (!mipi->read_commands[i])
+			return false;
+		if (cmd == mipi->read_commands[i])
+			return true;
+	}
+
+	return false;
+}
+
+/**
+ * mipi_dbi_command_read - MIPI DCS read command
+ * @mipi: MIPI structure
+ * @cmd: Command
+ * @val: Value read
+ *
+ * Send MIPI DCS read command to the controller.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int mipi_dbi_command_read(struct mipi_dbi *mipi, u8 cmd, u8 *val)
+{
+	if (!mipi->read_commands)
+		return -EACCES;
+
+	if (!mipi_dbi_command_is_read(mipi, cmd))
+		return -EINVAL;
+
+	return mipi_dbi_command_buf(mipi, cmd, val, 1);
+}
+EXPORT_SYMBOL(mipi_dbi_command_read);
+
+/**
+ * mipi_dbi_command_buf - MIPI DCS command with parameter(s) in an array
+ * @mipi: MIPI structure
+ * @cmd: Command
+ * @data: Parameter buffer
+ * @len: Buffer length
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int mipi_dbi_command_buf(struct mipi_dbi *mipi, u8 cmd, u8 *data, size_t len)
+{
+	int ret;
+
+	mutex_lock(&mipi->cmdlock);
+	ret = mipi->command(mipi, cmd, data, len);
+	mutex_unlock(&mipi->cmdlock);
+
+	return ret;
+}
+EXPORT_SYMBOL(mipi_dbi_command_buf);
+
+static int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
+				struct drm_clip_rect *clip, bool swap)
+{
+	struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
+	struct dma_buf_attachment *import_attach = cma_obj->base.import_attach;
+	struct drm_format_name_buf format_name;
+	void *src = cma_obj->vaddr;
+	int ret = 0;
+
+	if (import_attach) {
+		ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
+					       DMA_FROM_DEVICE);
+		if (ret)
+			return ret;
+	}
+
+	switch (fb->format->format) {
+	case DRM_FORMAT_RGB565:
+		if (swap)
+			tinydrm_swab16(dst, src, fb, clip);
+		else
+			tinydrm_memcpy(dst, src, fb, clip);
+		break;
+	case DRM_FORMAT_XRGB8888:
+		tinydrm_xrgb8888_to_rgb565(dst, src, fb, clip, swap);
+		break;
+	default:
+		dev_err_once(fb->dev->dev, "Format is not supported: %s\n",
+			     drm_get_format_name(fb->format->format,
+						 &format_name));
+		return -EINVAL;
+	}
+
+	if (import_attach)
+		ret = dma_buf_end_cpu_access(import_attach->dmabuf,
+					     DMA_FROM_DEVICE);
+	return ret;
+}
+
+static int mipi_dbi_fb_dirty(struct drm_framebuffer *fb,
+			     struct drm_file *file_priv,
+			     unsigned int flags, unsigned int color,
+			     struct drm_clip_rect *clips,
+			     unsigned int num_clips)
+{
+	struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
+	struct tinydrm_device *tdev = fb->dev->dev_private;
+	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
+	bool swap = mipi->swap_bytes;
+	struct drm_clip_rect clip;
+	int ret = 0;
+	bool full;
+	void *tr;
+
+	mutex_lock(&tdev->dirty_lock);
+
+	if (!mipi->enabled)
+		goto out_unlock;
+
+	/* fbdev can flush even when we're not interested */
+	if (tdev->pipe.plane.fb != fb)
+		goto out_unlock;
+
+	full = tinydrm_merge_clips(&clip, clips, num_clips, flags,
+				   fb->width, fb->height);
+
+	DRM_DEBUG("Flushing [FB:%d] x1=%u, x2=%u, y1=%u, y2=%u\n", fb->base.id,
+		  clip.x1, clip.x2, clip.y1, clip.y2);
+
+	if (!mipi->dc || !full || swap ||
+	    fb->format->format == DRM_FORMAT_XRGB8888) {
+		tr = mipi->tx_buf;
+		ret = mipi_dbi_buf_copy(mipi->tx_buf, fb, &clip, swap);
+		if (ret)
+			goto out_unlock;
+	} else {
+		tr = cma_obj->vaddr;
+	}
+
+	mipi_dbi_command(mipi, MIPI_DCS_SET_COLUMN_ADDRESS,
+			 (clip.x1 >> 8) & 0xFF, clip.x1 & 0xFF,
+			 (clip.x2 >> 8) & 0xFF, (clip.x2 - 1) & 0xFF);
+	mipi_dbi_command(mipi, MIPI_DCS_SET_PAGE_ADDRESS,
+			 (clip.y1 >> 8) & 0xFF, clip.y1 & 0xFF,
+			 (clip.y2 >> 8) & 0xFF, (clip.y2 - 1) & 0xFF);
+
+	ret = mipi_dbi_command_buf(mipi, MIPI_DCS_WRITE_MEMORY_START, tr,
+				(clip.x2 - clip.x1) * (clip.y2 - clip.y1) * 2);
+
+out_unlock:
+	mutex_unlock(&tdev->dirty_lock);
+
+	if (ret)
+		dev_err_once(fb->dev->dev, "Failed to update display %d\n",
+			     ret);
+
+	return ret;
+}
+
+static const struct drm_framebuffer_funcs mipi_dbi_fb_funcs = {
+	.destroy	= drm_fb_cma_destroy,
+	.create_handle	= drm_fb_cma_create_handle,
+	.dirty		= mipi_dbi_fb_dirty,
+};
+
+/**
+ * mipi_dbi_pipe_enable - MIPI DBI pipe enable helper
+ * @pipe: Display pipe
+ * @crtc_state: CRTC state
+ *
+ * This function enables backlight. Drivers can use this as their
+ * &drm_simple_display_pipe_funcs->enable callback.
+ */
+void mipi_dbi_pipe_enable(struct drm_simple_display_pipe *pipe,
+			  struct drm_crtc_state *crtc_state)
+{
+	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
+	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
+	struct drm_framebuffer *fb = pipe->plane.fb;
+
+	DRM_DEBUG_KMS("\n");
+
+	mipi->enabled = true;
+	if (fb)
+		fb->funcs->dirty(fb, NULL, 0, 0, NULL, 0);
+
+	tinydrm_enable_backlight(mipi->backlight);
+}
+EXPORT_SYMBOL(mipi_dbi_pipe_enable);
+
+static void mipi_dbi_blank(struct mipi_dbi *mipi)
+{
+	struct drm_device *drm = mipi->tinydrm.drm;
+	u16 height = drm->mode_config.min_height;
+	u16 width = drm->mode_config.min_width;
+	size_t len = width * height * 2;
+
+	memset(mipi->tx_buf, 0, len);
+
+	mipi_dbi_command(mipi, MIPI_DCS_SET_COLUMN_ADDRESS, 0, 0,
+			 (width >> 8) & 0xFF, (width - 1) & 0xFF);
+	mipi_dbi_command(mipi, MIPI_DCS_SET_PAGE_ADDRESS, 0, 0,
+			 (height >> 8) & 0xFF, (height - 1) & 0xFF);
+	mipi_dbi_command_buf(mipi, MIPI_DCS_WRITE_MEMORY_START,
+			     (u8 *)mipi->tx_buf, len);
+}
+
+/**
+ * mipi_dbi_pipe_disable - MIPI DBI pipe disable helper
+ * @pipe: Display pipe
+ *
+ * This function disables backlight if present or if not the
+ * display memory is blanked. Drivers can use this as their
+ * &drm_simple_display_pipe_funcs->disable callback.
+ */
+void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe)
+{
+	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
+	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
+
+	DRM_DEBUG_KMS("\n");
+
+	mipi->enabled = false;
+
+	if (mipi->backlight)
+		tinydrm_disable_backlight(mipi->backlight);
+	else
+		mipi_dbi_blank(mipi);
+}
+EXPORT_SYMBOL(mipi_dbi_pipe_disable);
+
+static const uint32_t mipi_dbi_formats[] = {
+	DRM_FORMAT_RGB565,
+	DRM_FORMAT_XRGB8888,
+};
+
+/**
+ * mipi_dbi_init - MIPI DBI initialization
+ * @dev: Parent device
+ * @mipi: &mipi_dbi structure to initialize
+ * @pipe_funcs: Display pipe functions
+ * @driver: DRM driver
+ * @mode: Display mode
+ * @rotation: Initial rotation in degrees Counter Clock Wise
+ *
+ * This function initializes a &mipi_dbi structure and it's underlying
+ * @tinydrm_device. It also sets up the display pipeline.
+ *
+ * Supported formats: Native RGB565 and emulated XRGB8888.
+ *
+ * Objects created by this function will be automatically freed on driver
+ * detach (devres).
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int mipi_dbi_init(struct device *dev, struct mipi_dbi *mipi,
+		  const struct drm_simple_display_pipe_funcs *pipe_funcs,
+		  struct drm_driver *driver,
+		  const struct drm_display_mode *mode, unsigned int rotation)
+{
+	size_t bufsize = mode->vdisplay * mode->hdisplay * sizeof(u16);
+	struct tinydrm_device *tdev = &mipi->tinydrm;
+	int ret;
+
+	if (!mipi->command)
+		return -EINVAL;
+
+	mutex_init(&mipi->cmdlock);
+
+	mipi->tx_buf = devm_kmalloc(dev, bufsize, GFP_KERNEL);
+	if (!mipi->tx_buf)
+		return -ENOMEM;
+
+	ret = devm_tinydrm_init(dev, tdev, &mipi_dbi_fb_funcs, driver);
+	if (ret)
+		return ret;
+
+	/* TODO: Maybe add DRM_MODE_CONNECTOR_SPI */
+	ret = tinydrm_display_pipe_init(tdev, pipe_funcs,
+					DRM_MODE_CONNECTOR_VIRTUAL,
+					mipi_dbi_formats,
+					ARRAY_SIZE(mipi_dbi_formats), mode,
+					rotation);
+	if (ret)
+		return ret;
+
+	tdev->drm->mode_config.preferred_depth = 16;
+	mipi->rotation = rotation;
+
+	drm_mode_config_reset(tdev->drm);
+
+	DRM_DEBUG_KMS("preferred_depth=%u, rotation = %u\n",
+		      tdev->drm->mode_config.preferred_depth, rotation);
+
+	return 0;
+}
+EXPORT_SYMBOL(mipi_dbi_init);
+
+/**
+ * mipi_dbi_hw_reset - Hardware reset of controller
+ * @mipi: MIPI DBI structure
+ *
+ * Reset controller if the &mipi_dbi->reset gpio is set.
+ */
+void mipi_dbi_hw_reset(struct mipi_dbi *mipi)
+{
+	if (!mipi->reset)
+		return;
+
+	gpiod_set_value_cansleep(mipi->reset, 0);
+	msleep(20);
+	gpiod_set_value_cansleep(mipi->reset, 1);
+	msleep(120);
+}
+EXPORT_SYMBOL(mipi_dbi_hw_reset);
+
+/**
+ * mipi_dbi_display_is_on - Check if display is on
+ * @mipi: MIPI DBI structure
+ *
+ * This function checks the Power Mode register (if readable) to see if
+ * display output is turned on. This can be used to see if the bootloader
+ * has already turned on the display avoiding flicker when the pipeline is
+ * enabled.
+ *
+ * Returns:
+ * true if the display can be verified to be on, false otherwise.
+ */
+bool mipi_dbi_display_is_on(struct mipi_dbi *mipi)
+{
+	u8 val;
+
+	if (mipi_dbi_command_read(mipi, MIPI_DCS_GET_POWER_MODE, &val))
+		return false;
+
+	val &= ~DCS_POWER_MODE_RESERVED_MASK;
+
+	if (val != (DCS_POWER_MODE_DISPLAY |
+	    DCS_POWER_MODE_DISPLAY_NORMAL_MODE | DCS_POWER_MODE_SLEEP_MODE))
+		return false;
+
+	DRM_DEBUG_DRIVER("Display is ON\n");
+
+	return true;
+}
+EXPORT_SYMBOL(mipi_dbi_display_is_on);
+
+#if IS_ENABLED(CONFIG_SPI)
+
+/*
+ * Many controllers have a max speed of 10MHz, but can be pushed way beyond
+ * that. Increase reliability by running pixel data at max speed and the rest
+ * at 10MHz, preventing transfer glitches from messing up the init settings.
+ */
+static u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len)
+{
+	if (len > 64)
+		return 0; /* use default */
+
+	return min_t(u32, 10000000, spi->max_speed_hz);
+}
+
+/*
+ * MIPI DBI Type C Option 1
+ *
+ * If the SPI controller doesn't have 9 bits per word support,
+ * use blocks of 9 bytes to send 8x 9-bit words using a 8-bit SPI transfer.
+ * Pad partial blocks with MIPI_DCS_NOP (zero).
+ * This is how the D/C bit (x) is added:
+ *     x7654321
+ *     0x765432
+ *     10x76543
+ *     210x7654
+ *     3210x765
+ *     43210x76
+ *     543210x7
+ *     6543210x
+ *     76543210
+ */
+
+static int mipi_dbi_spi1e_transfer(struct mipi_dbi *mipi, int dc,
+				   const void *buf, size_t len,
+				   unsigned int bpw)
+{
+	bool swap_bytes = (bpw == 16 && tinydrm_machine_little_endian());
+	size_t chunk, max_chunk = mipi->tx_buf9_len;
+	struct spi_device *spi = mipi->spi;
+	struct spi_transfer tr = {
+		.tx_buf = mipi->tx_buf9,
+		.bits_per_word = 8,
+	};
+	struct spi_message m;
+	const u8 *src = buf;
+	int i, ret;
+	u8 *dst;
+
+	if (drm_debug & DRM_UT_DRIVER)
+		pr_debug("[drm:%s] dc=%d, max_chunk=%zu, transfers:\n",
+			 __func__, dc, max_chunk);
+
+	tr.speed_hz = mipi_dbi_spi_cmd_max_speed(spi, len);
+	spi_message_init_with_transfers(&m, &tr, 1);
+
+	if (!dc) {
+		if (WARN_ON_ONCE(len != 1))
+			return -EINVAL;
+
+		/* Command: pad no-op's (zeroes) at beginning of block */
+		dst = mipi->tx_buf9;
+		memset(dst, 0, 9);
+		dst[8] = *src;
+		tr.len = 9;
+
+		tinydrm_dbg_spi_message(spi, &m);
+
+		return spi_sync(spi, &m);
+	}
+
+	/* max with room for adding one bit per byte */
+	max_chunk = max_chunk / 9 * 8;
+	/* but no bigger than len */
+	max_chunk = min(max_chunk, len);
+	/* 8 byte blocks */
+	max_chunk = max_t(size_t, 8, max_chunk & ~0x7);
+
+	while (len) {
+		size_t added = 0;
+
+		chunk = min(len, max_chunk);
+		len -= chunk;
+		dst = mipi->tx_buf9;
+
+		if (chunk < 8) {
+			u8 val, carry = 0;
+
+			/* Data: pad no-op's (zeroes) at end of block */
+			memset(dst, 0, 9);
+
+			if (swap_bytes) {
+				for (i = 1; i < (chunk + 1); i++) {
+					val = src[1];
+					*dst++ = carry | BIT(8 - i) | (val >> i);
+					carry = val << (8 - i);
+					i++;
+					val = src[0];
+					*dst++ = carry | BIT(8 - i) | (val >> i);
+					carry = val << (8 - i);
+					src += 2;
+				}
+				*dst++ = carry;
+			} else {
+				for (i = 1; i < (chunk + 1); i++) {
+					val = *src++;
+					*dst++ = carry | BIT(8 - i) | (val >> i);
+					carry = val << (8 - i);
+				}
+				*dst++ = carry;
+			}
+
+			chunk = 8;
+			added = 1;
+		} else {
+			for (i = 0; i < chunk; i += 8) {
+				if (swap_bytes) {
+					*dst++ =                 BIT(7) | (src[1] >> 1);
+					*dst++ = (src[1] << 7) | BIT(6) | (src[0] >> 2);
+					*dst++ = (src[0] << 6) | BIT(5) | (src[3] >> 3);
+					*dst++ = (src[3] << 5) | BIT(4) | (src[2] >> 4);
+					*dst++ = (src[2] << 4) | BIT(3) | (src[5] >> 5);
+					*dst++ = (src[5] << 3) | BIT(2) | (src[4] >> 6);
+					*dst++ = (src[4] << 2) | BIT(1) | (src[7] >> 7);
+					*dst++ = (src[7] << 1) | BIT(0);
+					*dst++ = src[6];
+				} else {
+					*dst++ =                 BIT(7) | (src[0] >> 1);
+					*dst++ = (src[0] << 7) | BIT(6) | (src[1] >> 2);
+					*dst++ = (src[1] << 6) | BIT(5) | (src[2] >> 3);
+					*dst++ = (src[2] << 5) | BIT(4) | (src[3] >> 4);
+					*dst++ = (src[3] << 4) | BIT(3) | (src[4] >> 5);
+					*dst++ = (src[4] << 3) | BIT(2) | (src[5] >> 6);
+					*dst++ = (src[5] << 2) | BIT(1) | (src[6] >> 7);
+					*dst++ = (src[6] << 1) | BIT(0);
+					*dst++ = src[7];
+				}
+
+				src += 8;
+				added++;
+			}
+		}
+
+		tr.len = chunk + added;
+
+		tinydrm_dbg_spi_message(spi, &m);
+		ret = spi_sync(spi, &m);
+		if (ret)
+			return ret;
+	};
+
+	return 0;
+}
+
+static int mipi_dbi_spi1_transfer(struct mipi_dbi *mipi, int dc,
+				  const void *buf, size_t len,
+				  unsigned int bpw)
+{
+	struct spi_device *spi = mipi->spi;
+	struct spi_transfer tr = {
+		.bits_per_word = 9,
+	};
+	const u16 *src16 = buf;
+	const u8 *src8 = buf;
+	struct spi_message m;
+	size_t max_chunk;
+	u16 *dst16;
+	int ret;
+
+	if (!tinydrm_spi_bpw_supported(spi, 9))
+		return mipi_dbi_spi1e_transfer(mipi, dc, buf, len, bpw);
+
+	tr.speed_hz = mipi_dbi_spi_cmd_max_speed(spi, len);
+	max_chunk = mipi->tx_buf9_len;
+	dst16 = mipi->tx_buf9;
+
+	if (drm_debug & DRM_UT_DRIVER)
+		pr_debug("[drm:%s] dc=%d, max_chunk=%zu, transfers:\n",
+			 __func__, dc, max_chunk);
+
+	max_chunk = min(max_chunk / 2, len);
+
+	spi_message_init_with_transfers(&m, &tr, 1);
+	tr.tx_buf = dst16;
+
+	while (len) {
+		size_t chunk = min(len, max_chunk);
+		unsigned int i;
+
+		if (bpw == 16 && tinydrm_machine_little_endian()) {
+			for (i = 0; i < (chunk * 2); i += 2) {
+				dst16[i]     = *src16 >> 8;
+				dst16[i + 1] = *src16++ & 0xFF;
+				if (dc) {
+					dst16[i]     |= 0x0100;
+					dst16[i + 1] |= 0x0100;
+				}
+			}
+		} else {
+			for (i = 0; i < chunk; i++) {
+				dst16[i] = *src8++;
+				if (dc)
+					dst16[i] |= 0x0100;
+			}
+		}
+
+		tr.len = chunk;
+		len -= chunk;
+
+		tinydrm_dbg_spi_message(spi, &m);
+		ret = spi_sync(spi, &m);
+		if (ret)
+			return ret;
+	};
+
+	return 0;
+}
+
+static int mipi_dbi_typec1_command(struct mipi_dbi *mipi, u8 cmd,
+				   u8 *parameters, size_t num)
+{
+	unsigned int bpw = (cmd == MIPI_DCS_WRITE_MEMORY_START) ? 16 : 8;
+	int ret;
+
+	if (mipi_dbi_command_is_read(mipi, cmd))
+		return -ENOTSUPP;
+
+	MIPI_DBI_DEBUG_COMMAND(cmd, parameters, num);
+
+	ret = mipi_dbi_spi1_transfer(mipi, 0, &cmd, 1, 8);
+	if (ret || !num)
+		return ret;
+
+	return mipi_dbi_spi1_transfer(mipi, 1, parameters, num, bpw);
+}
+
+/* MIPI DBI Type C Option 3 */
+
+static int mipi_dbi_typec3_command_read(struct mipi_dbi *mipi, u8 cmd,
+					u8 *data, size_t len)
+{
+	struct spi_device *spi = mipi->spi;
+	u32 speed_hz = min_t(u32, MIPI_DBI_MAX_SPI_READ_SPEED,
+			     spi->max_speed_hz / 2);
+	struct spi_transfer tr[2] = {
+		{
+			.speed_hz = speed_hz,
+			.tx_buf = &cmd,
+			.len = 1,
+		}, {
+			.speed_hz = speed_hz,
+			.len = len,
+		},
+	};
+	struct spi_message m;
+	u8 *buf;
+	int ret;
+
+	if (!len)
+		return -EINVAL;
+
+	/*
+	 * Support non-standard 24-bit and 32-bit Nokia read commands which
+	 * start with a dummy clock, so we need to read an extra byte.
+	 */
+	if (cmd == MIPI_DCS_GET_DISPLAY_ID ||
+	    cmd == MIPI_DCS_GET_DISPLAY_STATUS) {
+		if (!(len == 3 || len == 4))
+			return -EINVAL;
+
+		tr[1].len = len + 1;
+	}
+
+	buf = kmalloc(tr[1].len, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	tr[1].rx_buf = buf;
+	gpiod_set_value_cansleep(mipi->dc, 0);
+
+	spi_message_init_with_transfers(&m, tr, ARRAY_SIZE(tr));
+	ret = spi_sync(spi, &m);
+	if (ret)
+		goto err_free;
+
+	tinydrm_dbg_spi_message(spi, &m);
+
+	if (tr[1].len == len) {
+		memcpy(data, buf, len);
+	} else {
+		unsigned int i;
+
+		for (i = 0; i < len; i++)
+			data[i] = (buf[i] << 1) | !!(buf[i + 1] & BIT(7));
+	}
+
+	MIPI_DBI_DEBUG_COMMAND(cmd, data, len);
+
+err_free:
+	kfree(buf);
+
+	return ret;
+}
+
+static int mipi_dbi_typec3_command(struct mipi_dbi *mipi, u8 cmd,
+				   u8 *par, size_t num)
+{
+	struct spi_device *spi = mipi->spi;
+	unsigned int bpw = 8;
+	u32 speed_hz;
+	int ret;
+
+	if (mipi_dbi_command_is_read(mipi, cmd))
+		return mipi_dbi_typec3_command_read(mipi, cmd, par, num);
+
+	MIPI_DBI_DEBUG_COMMAND(cmd, par, num);
+
+	gpiod_set_value_cansleep(mipi->dc, 0);
+	speed_hz = mipi_dbi_spi_cmd_max_speed(spi, 1);
+	ret = tinydrm_spi_transfer(spi, speed_hz, NULL, 8, &cmd, 1);
+	if (ret || !num)
+		return ret;
+
+	if (cmd == MIPI_DCS_WRITE_MEMORY_START && !mipi->swap_bytes)
+		bpw = 16;
+
+	gpiod_set_value_cansleep(mipi->dc, 1);
+	speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num);
+
+	return tinydrm_spi_transfer(spi, speed_hz, NULL, bpw, par, num);
+}
+
+/**
+ * mipi_dbi_spi_init - Initialize MIPI DBI SPI interfaced controller
+ * @spi: SPI device
+ * @dc: D/C gpio (optional)
+ * @mipi: &mipi_dbi structure to initialize
+ * @pipe_funcs: Display pipe functions
+ * @driver: DRM driver
+ * @mode: Display mode
+ * @rotation: Initial rotation in degrees Counter Clock Wise
+ *
+ * This function sets &mipi_dbi->command, enables &mipi->read_commands for the
+ * usual read commands and initializes @mipi using mipi_dbi_init().
+ *
+ * If @dc is set, a Type C Option 3 interface is assumed, if not
+ * Type C Option 1.
+ *
+ * If the SPI master driver doesn't support the necessary bits per word,
+ * the following transformation is used:
+ *
+ * - 9-bit: reorder buffer as 9x 8-bit words, padded with no-op command.
+ * - 16-bit: if big endian send as 8-bit, if little endian swap bytes
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *mipi,
+		      struct gpio_desc *dc,
+		      const struct drm_simple_display_pipe_funcs *pipe_funcs,
+		      struct drm_driver *driver,
+		      const struct drm_display_mode *mode,
+		      unsigned int rotation)
+{
+	size_t tx_size = tinydrm_spi_max_transfer_size(spi, 0);
+	struct device *dev = &spi->dev;
+	int ret;
+
+	if (tx_size < 16) {
+		DRM_ERROR("SPI transmit buffer too small: %zu\n", tx_size);
+		return -EINVAL;
+	}
+
+	/*
+	 * Even though it's not the SPI device that does DMA (the master does),
+	 * the dma mask is necessary for the dma_alloc_wc() in
+	 * drm_gem_cma_create(). The dma_addr returned will be a physical
+	 * adddress which might be different from the bus address, but this is
+	 * not a problem since the address will not be used.
+	 * The virtual address is used in the transfer and the SPI core
+	 * re-maps it on the SPI master device using the DMA streaming API
+	 * (spi_map_buf()).
+	 */
+	if (!dev->coherent_dma_mask) {
+		ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
+		if (ret) {
+			dev_warn(dev, "Failed to set dma mask %d\n", ret);
+			return ret;
+		}
+	}
+
+	mipi->spi = spi;
+	mipi->read_commands = mipi_dbi_dcs_read_commands;
+
+	if (dc) {
+		mipi->command = mipi_dbi_typec3_command;
+		mipi->dc = dc;
+		if (tinydrm_machine_little_endian() &&
+		    !tinydrm_spi_bpw_supported(spi, 16))
+			mipi->swap_bytes = true;
+	} else {
+		mipi->command = mipi_dbi_typec1_command;
+		mipi->tx_buf9_len = tx_size;
+		mipi->tx_buf9 = devm_kmalloc(dev, tx_size, GFP_KERNEL);
+		if (!mipi->tx_buf9)
+			return -ENOMEM;
+	}
+
+	return mipi_dbi_init(dev, mipi, pipe_funcs, driver, mode, rotation);
+}
+EXPORT_SYMBOL(mipi_dbi_spi_init);
+
+#endif /* CONFIG_SPI */
+
+#ifdef CONFIG_DEBUG_FS
+
+static ssize_t mipi_dbi_debugfs_command_write(struct file *file,
+					      const char __user *ubuf,
+					      size_t count, loff_t *ppos)
+{
+	struct seq_file *m = file->private_data;
+	struct mipi_dbi *mipi = m->private;
+	u8 val, cmd = 0, parameters[64];
+	char *buf, *pos, *token;
+	unsigned int i;
+	int ret;
+
+	buf = memdup_user_nul(ubuf, count);
+	if (IS_ERR(buf))
+		return PTR_ERR(buf);
+
+	/* strip trailing whitespace */
+	for (i = count - 1; i > 0; i--)
+		if (isspace(buf[i]))
+			buf[i] = '\0';
+		else
+			break;
+	i = 0;
+	pos = buf;
+	while (pos) {
+		token = strsep(&pos, " ");
+		if (!token) {
+			ret = -EINVAL;
+			goto err_free;
+		}
+
+		ret = kstrtou8(token, 16, &val);
+		if (ret < 0)
+			goto err_free;
+
+		if (token == buf)
+			cmd = val;
+		else
+			parameters[i++] = val;
+
+		if (i == 64) {
+			ret = -E2BIG;
+			goto err_free;
+		}
+	}
+
+	ret = mipi_dbi_command_buf(mipi, cmd, parameters, i);
+
+err_free:
+	kfree(buf);
+
+	return ret < 0 ? ret : count;
+}
+
+static int mipi_dbi_debugfs_command_show(struct seq_file *m, void *unused)
+{
+	struct mipi_dbi *mipi = m->private;
+	u8 cmd, val[4];
+	size_t len, i;
+	int ret;
+
+	for (cmd = 0; cmd < 255; cmd++) {
+		if (!mipi_dbi_command_is_read(mipi, cmd))
+			continue;
+
+		switch (cmd) {
+		case MIPI_DCS_READ_MEMORY_START:
+		case MIPI_DCS_READ_MEMORY_CONTINUE:
+			len = 2;
+			break;
+		case MIPI_DCS_GET_DISPLAY_ID:
+			len = 3;
+			break;
+		case MIPI_DCS_GET_DISPLAY_STATUS:
+			len = 4;
+			break;
+		default:
+			len = 1;
+			break;
+		}
+
+		seq_printf(m, "%02x: ", cmd);
+		ret = mipi_dbi_command_buf(mipi, cmd, val, len);
+		if (ret) {
+			seq_puts(m, "XX\n");
+			continue;
+		}
+
+		for (i = 0; i < len; i++)
+			seq_printf(m, "%02x", val[i]);
+		seq_puts(m, "\n");
+	}
+
+	return 0;
+}
+
+static int mipi_dbi_debugfs_command_open(struct inode *inode,
+					 struct file *file)
+{
+	return single_open(file, mipi_dbi_debugfs_command_show,
+			   inode->i_private);
+}
+
+static const struct file_operations mipi_dbi_debugfs_command_fops = {
+	.owner = THIS_MODULE,
+	.open = mipi_dbi_debugfs_command_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+	.write = mipi_dbi_debugfs_command_write,
+};
+
+static const struct drm_info_list mipi_dbi_debugfs_list[] = {
+	{ "fb",   drm_fb_cma_debugfs_show, 0 },
+};
+
+/**
+ * mipi_dbi_debugfs_init - Create debugfs entries
+ * @minor: DRM minor
+ *
+ * This function creates a 'command' debugfs file for sending commands to the
+ * controller or getting the read command values.
+ * Drivers can use this as their &drm_driver->debugfs_init callback.
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int mipi_dbi_debugfs_init(struct drm_minor *minor)
+{
+	struct tinydrm_device *tdev = minor->dev->dev_private;
+	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
+	umode_t mode = S_IFREG | S_IWUSR;
+
+	if (mipi->read_commands)
+		mode |= S_IRUGO;
+	debugfs_create_file("command", mode, minor->debugfs_root, mipi,
+			    &mipi_dbi_debugfs_command_fops);
+
+	return drm_debugfs_create_files(mipi_dbi_debugfs_list,
+					ARRAY_SIZE(mipi_dbi_debugfs_list),
+					minor->debugfs_root, minor);
+}
+EXPORT_SYMBOL(mipi_dbi_debugfs_init);
+
+#endif
+
+MODULE_LICENSE("GPL");