diff options
author | Andrey Gusakov <andrey.gusakov@cogentembedded.com> | 2016-07-13 13:19:59 +0530 |
---|---|---|
committer | Archit Taneja <architt@codeaurora.org> | 2016-07-17 14:00:57 +0530 |
commit | 7caff0fc4296eba5e2e473e6719726c65f1b7c31 (patch) | |
tree | 46d1e6e00a15dd6b2f6b0543ef923b8d1b4ec667 | |
parent | 22a935622314b2e798dda16452da0c5c521da8ad (diff) | |
download | linux-stable-7caff0fc4296eba5e2e473e6719726c65f1b7c31.tar.gz linux-stable-7caff0fc4296eba5e2e473e6719726c65f1b7c31.tar.bz2 linux-stable-7caff0fc4296eba5e2e473e6719726c65f1b7c31.zip |
drm/bridge: tc358767: Add DPI to eDP bridge driver
Add a drm_bridge driver for the Toshiba TC358767 DPI/DSI to
eDP/DP bridge. Currently only DPI input with 24-bit RGB is
supported.
Signed-off-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
-rw-r--r-- | drivers/gpu/drm/bridge/Kconfig | 9 | ||||
-rw-r--r-- | drivers/gpu/drm/bridge/Makefile | 1 | ||||
-rw-r--r-- | drivers/gpu/drm/bridge/tc358767.c | 1413 |
3 files changed, 1423 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index fd7bd7d45151..b590e678052d 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -58,6 +58,15 @@ config DRM_SII902X ---help--- Silicon Image sii902x bridge chip driver. +config DRM_TOSHIBA_TC358767 + tristate "Toshiba TC358767 eDP bridge" + depends on OF + select DRM_KMS_HELPER + select REGMAP_I2C + select DRM_PANEL + ---help--- + Toshiba TC358767 eDP bridge chip driver. + source "drivers/gpu/drm/bridge/analogix/Kconfig" source "drivers/gpu/drm/bridge/adv7511/Kconfig" diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index d08bdd1c4ff8..efdb07e878f5 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -6,5 +6,6 @@ obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw-hdmi-ahb-audio.o obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o obj-$(CONFIG_DRM_SII902X) += sii902x.o +obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix/ obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/ diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c new file mode 100644 index 000000000000..a09825d8c94a --- /dev/null +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -0,0 +1,1413 @@ +/* + * tc358767 eDP bridge driver + * + * Copyright (C) 2016 CogentEmbedded Inc + * Author: Andrey Gusakov <andrey.gusakov@cogentembedded.com> + * + * Copyright (C) 2016 Pengutronix, Philipp Zabel <p.zabel@pengutronix.de> + * + * Initially based on: drivers/gpu/drm/i2c/tda998x_drv.c + * + * Copyright (C) 2012 Texas Instruments + * Author: Rob Clark <robdclark@gmail.com> + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/slab.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_dp_helper.h> +#include <drm/drm_edid.h> +#include <drm/drm_of.h> +#include <drm/drm_panel.h> + +/* Registers */ + +/* Display Parallel Interface */ +#define DPIPXLFMT 0x0440 +#define VS_POL_ACTIVE_LOW (1 << 10) +#define HS_POL_ACTIVE_LOW (1 << 9) +#define DE_POL_ACTIVE_HIGH (0 << 8) +#define SUB_CFG_TYPE_CONFIG1 (0 << 2) /* LSB aligned */ +#define SUB_CFG_TYPE_CONFIG2 (1 << 2) /* Loosely Packed */ +#define SUB_CFG_TYPE_CONFIG3 (2 << 2) /* LSB aligned 8-bit */ +#define DPI_BPP_RGB888 (0 << 0) +#define DPI_BPP_RGB666 (1 << 0) +#define DPI_BPP_RGB565 (2 << 0) + +/* Video Path */ +#define VPCTRL0 0x0450 +#define OPXLFMT_RGB666 (0 << 8) +#define OPXLFMT_RGB888 (1 << 8) +#define FRMSYNC_DISABLED (0 << 4) /* Video Timing Gen Disabled */ +#define FRMSYNC_ENABLED (1 << 4) /* Video Timing Gen Enabled */ +#define MSF_DISABLED (0 << 0) /* Magic Square FRC disabled */ +#define MSF_ENABLED (1 << 0) /* Magic Square FRC enabled */ +#define HTIM01 0x0454 +#define HTIM02 0x0458 +#define VTIM01 0x045c +#define VTIM02 0x0460 +#define VFUEN0 0x0464 +#define VFUEN BIT(0) /* Video Frame Timing Upload */ + +/* System */ +#define TC_IDREG 0x0500 +#define SYSCTRL 0x0510 +#define DP0_AUDSRC_NO_INPUT (0 << 3) +#define DP0_AUDSRC_I2S_RX (1 << 3) +#define DP0_VIDSRC_NO_INPUT (0 << 0) +#define DP0_VIDSRC_DSI_RX (1 << 0) +#define DP0_VIDSRC_DPI_RX (2 << 0) +#define DP0_VIDSRC_COLOR_BAR (3 << 0) + +/* Control */ +#define DP0CTL 0x0600 +#define VID_MN_GEN BIT(6) /* Auto-generate M/N values */ +#define EF_EN BIT(5) /* Enable Enhanced Framing */ +#define VID_EN BIT(1) /* Video transmission enable */ +#define DP_EN BIT(0) /* Enable DPTX function */ + +/* Clocks */ +#define DP0_VIDMNGEN0 0x0610 +#define DP0_VIDMNGEN1 0x0614 +#define DP0_VMNGENSTATUS 0x0618 + +/* Main Channel */ +#define DP0_SECSAMPLE 0x0640 +#define DP0_VIDSYNCDELAY 0x0644 +#define DP0_TOTALVAL 0x0648 +#define DP0_STARTVAL 0x064c +#define DP0_ACTIVEVAL 0x0650 +#define DP0_SYNCVAL 0x0654 +#define DP0_MISC 0x0658 +#define TU_SIZE_RECOMMENDED (0x3f << 16) /* LSCLK cycles per TU */ +#define BPC_6 (0 << 5) +#define BPC_8 (1 << 5) + +/* AUX channel */ +#define DP0_AUXCFG0 0x0660 +#define DP0_AUXCFG1 0x0664 +#define AUX_RX_FILTER_EN BIT(16) + +#define DP0_AUXADDR 0x0668 +#define DP0_AUXWDATA(i) (0x066c + (i) * 4) +#define DP0_AUXRDATA(i) (0x067c + (i) * 4) +#define DP0_AUXSTATUS 0x068c +#define AUX_STATUS_MASK 0xf0 +#define AUX_STATUS_SHIFT 4 +#define AUX_TIMEOUT BIT(1) +#define AUX_BUSY BIT(0) +#define DP0_AUXI2CADR 0x0698 + +/* Link Training */ +#define DP0_SRCCTRL 0x06a0 +#define DP0_SRCCTRL_SCRMBLDIS BIT(13) +#define DP0_SRCCTRL_EN810B BIT(12) +#define DP0_SRCCTRL_NOTP (0 << 8) +#define DP0_SRCCTRL_TP1 (1 << 8) +#define DP0_SRCCTRL_TP2 (2 << 8) +#define DP0_SRCCTRL_LANESKEW BIT(7) +#define DP0_SRCCTRL_SSCG BIT(3) +#define DP0_SRCCTRL_LANES_1 (0 << 2) +#define DP0_SRCCTRL_LANES_2 (1 << 2) +#define DP0_SRCCTRL_BW27 (1 << 1) +#define DP0_SRCCTRL_BW162 (0 << 1) +#define DP0_SRCCTRL_AUTOCORRECT BIT(0) +#define DP0_LTSTAT 0x06d0 +#define LT_LOOPDONE BIT(13) +#define LT_STATUS_MASK (0x1f << 8) +#define LT_CHANNEL1_EQ_BITS (DP_CHANNEL_EQ_BITS << 4) +#define LT_INTERLANE_ALIGN_DONE BIT(3) +#define LT_CHANNEL0_EQ_BITS (DP_CHANNEL_EQ_BITS) +#define DP0_SNKLTCHGREQ 0x06d4 +#define DP0_LTLOOPCTRL 0x06d8 +#define DP0_SNKLTCTRL 0x06e4 + +/* PHY */ +#define DP_PHY_CTRL 0x0800 +#define DP_PHY_RST BIT(28) /* DP PHY Global Soft Reset */ +#define BGREN BIT(25) /* AUX PHY BGR Enable */ +#define PWR_SW_EN BIT(24) /* PHY Power Switch Enable */ +#define PHY_M1_RST BIT(12) /* Reset PHY1 Main Channel */ +#define PHY_RDY BIT(16) /* PHY Main Channels Ready */ +#define PHY_M0_RST BIT(8) /* Reset PHY0 Main Channel */ +#define PHY_A0_EN BIT(1) /* PHY Aux Channel0 Enable */ +#define PHY_M0_EN BIT(0) /* PHY Main Channel0 Enable */ + +/* PLL */ +#define DP0_PLLCTRL 0x0900 +#define DP1_PLLCTRL 0x0904 /* not defined in DS */ +#define PXL_PLLCTRL 0x0908 +#define PLLUPDATE BIT(2) +#define PLLBYP BIT(1) +#define PLLEN BIT(0) +#define PXL_PLLPARAM 0x0914 +#define IN_SEL_REFCLK (0 << 14) +#define SYS_PLLPARAM 0x0918 +#define REF_FREQ_38M4 (0 << 8) /* 38.4 MHz */ +#define REF_FREQ_19M2 (1 << 8) /* 19.2 MHz */ +#define REF_FREQ_26M (2 << 8) /* 26 MHz */ +#define REF_FREQ_13M (3 << 8) /* 13 MHz */ +#define SYSCLK_SEL_LSCLK (0 << 4) +#define LSCLK_DIV_1 (0 << 0) +#define LSCLK_DIV_2 (1 << 0) + +/* Test & Debug */ +#define TSTCTL 0x0a00 +#define PLL_DBG 0x0a04 + +static bool tc_test_pattern; +module_param_named(test, tc_test_pattern, bool, 0644); + +struct tc_edp_link { + struct drm_dp_link base; + u8 assr; + int scrambler_dis; + int spread; + int coding8b10b; + u8 swing; + u8 preemp; +}; + +struct tc_data { + struct device *dev; + struct regmap *regmap; + struct drm_dp_aux aux; + + struct drm_bridge bridge; + struct drm_connector connector; + struct drm_panel *panel; + + /* link settings */ + struct tc_edp_link link; + + /* display edid */ + struct edid *edid; + /* current mode */ + struct drm_display_mode *mode; + + u32 rev; + u8 assr; + + struct gpio_desc *sd_gpio; + struct gpio_desc *reset_gpio; + struct clk *refclk; +}; + +static inline struct tc_data *aux_to_tc(struct drm_dp_aux *a) +{ + return container_of(a, struct tc_data, aux); +} + +static inline struct tc_data *bridge_to_tc(struct drm_bridge *b) +{ + return container_of(b, struct tc_data, bridge); +} + +static inline struct tc_data *connector_to_tc(struct drm_connector *c) +{ + return container_of(c, struct tc_data, connector); +} + +/* Simple macros to avoid repeated error checks */ +#define tc_write(reg, var) \ + do { \ + ret = regmap_write(tc->regmap, reg, var); \ + if (ret) \ + goto err; \ + } while (0) +#define tc_read(reg, var) \ + do { \ + ret = regmap_read(tc->regmap, reg, var); \ + if (ret) \ + goto err; \ + } while (0) + +static inline int tc_poll_timeout(struct regmap *map, unsigned int addr, + unsigned int cond_mask, + unsigned int cond_value, + unsigned long sleep_us, u64 timeout_us) +{ + ktime_t timeout = ktime_add_us(ktime_get(), timeout_us); + unsigned int val; + int ret; + + for (;;) { + ret = regmap_read(map, addr, &val); + if (ret) + break; + if ((val & cond_mask) == cond_value) + break; + if (timeout_us && ktime_compare(ktime_get(), timeout) > 0) { + ret = regmap_read(map, addr, &val); + break; + } + if (sleep_us) + usleep_range((sleep_us >> 2) + 1, sleep_us); + } + return ret ?: (((val & cond_mask) == cond_value) ? 0 : -ETIMEDOUT); +} + +static int tc_aux_wait_busy(struct tc_data *tc, unsigned int timeout_ms) +{ + return tc_poll_timeout(tc->regmap, DP0_AUXSTATUS, AUX_BUSY, 0, + 1000, 1000 * timeout_ms); +} + +static int tc_aux_get_status(struct tc_data *tc, u8 *reply) +{ + int ret; + u32 value; + + ret = regmap_read(tc->regmap, DP0_AUXSTATUS, &value); + if (ret < 0) + return ret; + if (value & AUX_BUSY) { + if (value & AUX_TIMEOUT) { + dev_err(tc->dev, "i2c access timeout!\n"); + return -ETIMEDOUT; + } + return -EBUSY; + } + + *reply = (value & AUX_STATUS_MASK) >> AUX_STATUS_SHIFT; + return 0; +} + +static ssize_t tc_aux_transfer(struct drm_dp_aux *aux, + struct drm_dp_aux_msg *msg) +{ + struct tc_data *tc = aux_to_tc(aux); + size_t size = min_t(size_t, 8, msg->size); + u8 request = msg->request & ~DP_AUX_I2C_MOT; + u8 *buf = msg->buffer; + u32 tmp = 0; + int i = 0; + int ret; + + if (size == 0) + return 0; + + ret = tc_aux_wait_busy(tc, 100); + if (ret) + goto err; + + if (request == DP_AUX_I2C_WRITE || request == DP_AUX_NATIVE_WRITE) { + /* Store data */ + while (i < size) { + if (request == DP_AUX_NATIVE_WRITE) + tmp = tmp | (buf[i] << (8 * (i & 0x3))); + else + tmp = (tmp << 8) | buf[i]; + i++; + if (((i % 4) == 0) || (i == size)) { + tc_write(DP0_AUXWDATA(i >> 2), tmp); + tmp = 0; + } + } + } else if (request != DP_AUX_I2C_READ && + request != DP_AUX_NATIVE_READ) { + return -EINVAL; + } + + /* Store address */ + tc_write(DP0_AUXADDR, msg->address); + /* Start transfer */ + tc_write(DP0_AUXCFG0, ((size - 1) << 8) | request); + + ret = tc_aux_wait_busy(tc, 100); + if (ret) + goto err; + + ret = tc_aux_get_status(tc, &msg->reply); + if (ret) + goto err; + + if (request == DP_AUX_I2C_READ || request == DP_AUX_NATIVE_READ) { + /* Read data */ + while (i < size) { + if ((i % 4) == 0) + tc_read(DP0_AUXRDATA(i >> 2), &tmp); + buf[i] = tmp & 0xff; + tmp = tmp >> 8; + i++; + } + } + + return size; +err: + return ret; +} + +static const char * const training_pattern1_errors[] = { + "No errors", + "Aux write error", + "Aux read error", + "Max voltage reached error", + "Loop counter expired error", + "res", "res", "res" +}; + +static const char * const training_pattern2_errors[] = { + "No errors", + "Aux write error", + "Aux read error", + "Clock recovery failed error", + "Loop counter expired error", + "res", "res", "res" +}; + +static u32 tc_srcctrl(struct tc_data *tc) +{ + /* + * No training pattern, skew lane 1 data by two LSCLK cycles with + * respect to lane 0 data, AutoCorrect Mode = 0 + */ + u32 reg = DP0_SRCCTRL_NOTP | DP0_SRCCTRL_LANESKEW; + + if (tc->link.scrambler_dis) + reg |= DP0_SRCCTRL_SCRMBLDIS; /* Scrambler Disabled */ + if (tc->link.coding8b10b) + /* Enable 8/10B Encoder (TxData[19:16] not used) */ + reg |= DP0_SRCCTRL_EN810B; + if (tc->link.spread) + reg |= DP0_SRCCTRL_SSCG; /* Spread Spectrum Enable */ + if (tc->link.base.num_lanes == 2) + reg |= DP0_SRCCTRL_LANES_2; /* Two Main Channel Lanes */ + if (tc->link.base.rate != 162000) + reg |= DP0_SRCCTRL_BW27; /* 2.7 Gbps link */ + return reg; +} + +static void tc_wait_pll_lock(struct tc_data *tc) +{ + /* Wait for PLL to lock: up to 2.09 ms, depending on refclk */ + usleep_range(3000, 6000); +} + +static int tc_pxl_pll_en(struct tc_data *tc, u32 refclk, u32 pixelclock) +{ + int ret; + int i_pre, best_pre = 1; + int i_post, best_post = 1; + int div, best_div = 1; + int mul, best_mul = 1; + int delta, best_delta; + int ext_div[] = {1, 2, 3, 5, 7}; + int best_pixelclock = 0; + int vco_hi = 0; + + dev_dbg(tc->dev, "PLL: requested %d pixelclock, ref %d\n", pixelclock, + refclk); + best_delta = pixelclock; + /* Loop over all possible ext_divs, skipping invalid configurations */ + for (i_pre = 0; i_pre < ARRAY_SIZE(ext_div); i_pre++) { + /* + * refclk / ext_pre_div should be in the 1 to 200 MHz range. + * We don't allow any refclk > 200 MHz, only check lower bounds. + */ + if (refclk / ext_div[i_pre] < 1000000) + continue; + for (i_post = 0; i_post < ARRAY_SIZE(ext_div); i_post++) { + for (div = 1; div <= 16; div++) { + u32 clk; + u64 tmp; + + tmp = pixelclock * ext_div[i_pre] * + ext_div[i_post] * div; + do_div(tmp, refclk); + mul = tmp; + + /* Check limits */ + if ((mul < 1) || (mul > 128)) + continue; + + clk = (refclk / ext_div[i_pre] / div) * mul; + /* + * refclk * mul / (ext_pre_div * pre_div) + * should be in the 150 to 650 MHz range + */ + if ((clk > 650000000) || (clk < 150000000)) + continue; + + clk = clk / ext_div[i_post]; + delta = clk - pixelclock; + + if (abs(delta) < abs(best_delta)) { + best_pre = i_pre; + best_post = i_post; + best_div = div; + best_mul = mul; + best_delta = delta; + best_pixelclock = clk; + } + } + } + } + if (best_pixelclock == 0) { + dev_err(tc->dev, "Failed to calc clock for %d pixelclock\n", + pixelclock); + return -EINVAL; + } + + dev_dbg(tc->dev, "PLL: got %d, delta %d\n", best_pixelclock, + best_delta); + dev_dbg(tc->dev, "PLL: %d / %d / %d * %d / %d\n", refclk, + ext_div[best_pre], best_div, best_mul, ext_div[best_post]); + + /* if VCO >= 300 MHz */ + if (refclk / ext_div[best_pre] / best_div * best_mul >= 300000000) + vco_hi = 1; + /* see DS */ + if (best_div == 16) + best_div = 0; + if (best_mul == 128) + best_mul = 0; + + /* Power up PLL and switch to bypass */ + tc_write(PXL_PLLCTRL, PLLBYP | PLLEN); + + tc_write(PXL_PLLPARAM, + (vco_hi << 24) | /* For PLL VCO >= 300 MHz = 1 */ + (ext_div[best_pre] << 20) | /* External Pre-divider */ + (ext_div[best_post] << 16) | /* External Post-divider */ + IN_SEL_REFCLK | /* Use RefClk as PLL input */ + (best_div << 8) | /* Divider for PLL RefClk */ + (best_mul << 0)); /* Multiplier for PLL */ + + /* Force PLL parameter update and disable bypass */ + tc_write(PXL_PLLCTRL, PLLUPDATE | PLLEN); + + tc_wait_pll_lock(tc); + + return 0; +err: + return ret; +} + +static int tc_pxl_pll_dis(struct tc_data *tc) +{ + /* Enable PLL bypass, power down PLL */ + return regmap_write(tc->regmap, PXL_PLLCTRL, PLLBYP); +} + +static int tc_stream_clock_calc(struct tc_data *tc) +{ + int ret; + /* + * If the Stream clock and Link Symbol clock are + * asynchronous with each other, the value of M changes over + * time. This way of generating link clock and stream + * clock is called Asynchronous Clock mode. The value M + * must change while the value N stays constant. The + * value of N in this Asynchronous Clock mode must be set + * to 2^15 or 32,768. + * + * LSCLK = 1/10 of high speed link clock + * + * f_STRMCLK = M/N * f_LSCLK + * M/N = f_STRMCLK / f_LSCLK + * + */ + tc_write(DP0_VIDMNGEN1, 32768); + + return 0; +err: + return ret; +} + +static int tc_aux_link_setup(struct tc_data *tc) +{ + unsigned long rate; + u32 value; + int ret; + + rate = clk_get_rate(tc->refclk); + switch (rate) { + case 38400000: + value = REF_FREQ_38M4; + break; + case 26000000: + value = REF_FREQ_26M; + break; + case 19200000: + value = REF_FREQ_19M2; + break; + case 13000000: + value = REF_FREQ_13M; + break; + default: + dev_err(tc->dev, "Invalid refclk rate: %lu Hz\n", rate); + return -EINVAL; + } + + /* Setup DP-PHY / PLL */ + value |= SYSCLK_SEL_LSCLK | LSCLK_DIV_2; + tc_write(SYS_PLLPARAM, value); + + tc_write(DP_PHY_CTRL, BGREN | PWR_SW_EN | BIT(2) | PHY_A0_EN); + + /* + * Initially PLLs are in bypass. Force PLL parameter update, + * disable PLL bypass, enable PLL + */ + tc_write(DP0_PLLCTRL, PLLUPDATE | PLLEN); + tc_wait_pll_lock(tc); + + tc_write(DP1_PLLCTRL, PLLUPDATE | PLLEN); + tc_wait_pll_lock(tc); + + ret = tc_poll_timeout(tc->regmap, DP_PHY_CTRL, PHY_RDY, PHY_RDY, 1, + 1000); + if (ret == -ETIMEDOUT) { + dev_err(tc->dev, "Timeout waiting for PHY to become ready"); + return ret; + } else if (ret) + goto err; + + /* Setup AUX link */ + tc_write(DP0_AUXCFG1, AUX_RX_FILTER_EN | + (0x06 << 8) | /* Aux Bit Period Calculator Threshold */ + (0x3f << 0)); /* Aux Response Timeout Timer */ + + return 0; +err: + dev_err(tc->dev, "tc_aux_link_setup failed: %d\n", ret); + return ret; +} + +static int tc_get_display_props(struct tc_data *tc) +{ + int ret; + /* temp buffer */ + u8 tmp[8]; + + /* Read DP Rx Link Capability */ + ret = drm_dp_link_probe(&tc->aux, &tc->link.base); + if (ret < 0) + goto err_dpcd_read; + if ((tc->link.base.rate != 162000) && (tc->link.base.rate != 270000)) + goto err_dpcd_inval; + + ret = drm_dp_dpcd_readb(&tc->aux, DP_MAX_DOWNSPREAD, tmp); + if (ret < 0) + goto err_dpcd_read; + tc->link.spread = tmp[0] & BIT(0); /* 0.5% down spread */ + + ret = drm_dp_dpcd_readb(&tc->aux, DP_MAIN_LINK_CHANNEL_CODING, tmp); + if (ret < 0) + goto err_dpcd_read; + tc->link.coding8b10b = tmp[0] & BIT(0); + tc->link.scrambler_dis = 0; + /* read assr */ + ret = drm_dp_dpcd_readb(&tc->aux, DP_EDP_CONFIGURATION_SET, tmp); + if (ret < 0) + goto err_dpcd_read; + tc->link.assr = tmp[0] & DP_ALTERNATE_SCRAMBLER_RESET_ENABLE; + + dev_dbg(tc->dev, "DPCD rev: %d.%d, rate: %s, lanes: %d, framing: %s\n", + tc->link.base.revision >> 4, tc->link.base.revision & 0x0f, + (tc->link.base.rate == 162000) ? "1.62Gbps" : "2.7Gbps", + tc->link.base.num_lanes, + (tc->link.base.capabilities & DP_LINK_CAP_ENHANCED_FRAMING) ? + "enhanced" : "non-enhanced"); + dev_dbg(tc->dev, "ANSI 8B/10B: %d\n", tc->link.coding8b10b); + dev_dbg(tc->dev, "Display ASSR: %d, TC358767 ASSR: %d\n", + tc->link.assr, tc->assr); + + return 0; + +err_dpcd_read: + dev_err(tc->dev, "failed to read DPCD: %d\n", ret); + return ret; +err_dpcd_inval: + dev_err(tc->dev, "invalid DPCD\n"); + return -EINVAL; +} + +static int tc_set_video_mode(struct tc_data *tc, struct drm_display_mode *mode) +{ + int ret; + int vid_sync_dly; + int max_tu_symbol; + + int left_margin = mode->htotal - mode->hsync_end; + int right_margin = mode->hsync_start - mode->hdisplay; + int hsync_len = mode->hsync_end - mode->hsync_start; + int upper_margin = mode->vtotal - mode->vsync_end; + int lower_margin = mode->vsync_start - mode->vdisplay; + int vsync_len = mode->vsync_end - mode->vsync_start; + + dev_dbg(tc->dev, "set mode %dx%d\n", + mode->hdisplay, mode->vdisplay); + dev_dbg(tc->dev, "H margin %d,%d sync %d\n", + left_margin, right_margin, hsync_len); + dev_dbg(tc->dev, "V margin %d,%d sync %d\n", + upper_margin, lower_margin, vsync_len); + dev_dbg(tc->dev, "total: %dx%d\n", mode->htotal, mode->vtotal); + + + /* LCD Ctl Frame Size */ + tc_write(VPCTRL0, (0x40 << 20) /* VSDELAY */ | + OPXLFMT_RGB888 | FRMSYNC_DISABLED | MSF_DISABLED); + tc_write(HTIM01, (left_margin << 16) | /* H back porch */ + (hsync_len << 0)); /* Hsync */ + tc_write(HTIM02, (right_margin << 16) | /* H front porch */ + (mode->hdisplay << 0)); /* width */ + tc_write(VTIM01, (upper_margin << 16) | /* V back porch */ + (vsync_len << 0)); /* Vsync */ + tc_write(VTIM02, (lower_margin << 16) | /* V front porch */ + (mode->vdisplay << 0)); /* height */ + tc_write(VFUEN0, VFUEN); /* update settings */ + + /* Test pattern settings */ + tc_write(TSTCTL, + (120 << 24) | /* Red Color component value */ + (20 << 16) | /* Green Color component value */ + (99 << 8) | /* Blue Color component value */ + (1 << 4) | /* Enable I2C Filter */ + (2 << 0) | /* Color bar Mode */ + 0); + + /* DP Main Stream Attributes */ + vid_sync_dly = hsync_len + left_margin + mode->hdisplay; + tc_write(DP0_VIDSYNCDELAY, + (0x003e << 16) | /* thresh_dly */ + (vid_sync_dly << 0)); + + tc_write(DP0_TOTALVAL, (mode->vtotal << 16) | (mode->htotal)); + + tc_write(DP0_STARTVAL, + ((upper_margin + vsync_len) << 16) | + ((left_margin + hsync_len) << 0)); + + tc_write(DP0_ACTIVEVAL, (mode->vdisplay << 16) | (mode->hdisplay)); + + tc_write(DP0_SYNCVAL, (vsync_len << 16) | (hsync_len << 0)); + + tc_write(DPIPXLFMT, VS_POL_ACTIVE_LOW | HS_POL_ACTIVE_LOW | + DE_POL_ACTIVE_HIGH | SUB_CFG_TYPE_CONFIG1 | DPI_BPP_RGB888); + + /* + * Recommended maximum number of symbols transferred in a transfer unit: + * DIV_ROUND_UP((input active video bandwidth in bytes) * tu_size, + * (output active video bandwidth in bytes)) + * Must be less than tu_size. + */ + max_tu_symbol = TU_SIZE_RECOMMENDED - 1; + tc_write(DP0_MISC, (max_tu_symbol << 23) | TU_SIZE_RECOMMENDED | BPC_8); + + return 0; +err: + return ret; +} + +static int tc_link_training(struct tc_data *tc, int pattern) +{ + const char * const *errors; + u32 srcctrl = tc_srcctrl(tc) | DP0_SRCCTRL_SCRMBLDIS | + DP0_SRCCTRL_AUTOCORRECT; + int timeout; + int retry; + u32 value; + int ret; + + if (pattern == DP_TRAINING_PATTERN_1) { + srcctrl |= DP0_SRCCTRL_TP1; + errors = training_pattern1_errors; + } else { + srcctrl |= DP0_SRCCTRL_TP2; + errors = training_pattern2_errors; + } + + /* Set DPCD 0x102 for Training Part 1 or 2 */ + tc_write(DP0_SNKLTCTRL, DP_LINK_SCRAMBLING_DISABLE | pattern); + + tc_write(DP0_LTLOOPCTRL, + (0x0f << 28) | /* Defer Iteration Count */ + (0x0f << 24) | /* Loop Iteration Count */ + (0x0d << 0)); /* Loop Timer Delay */ + + retry = 5; + do { + /* Set DP0 Training Pattern */ + tc_write(DP0_SRCCTRL, srcctrl); + + /* Enable DP0 to start Link Training */ + tc_write(DP0CTL, DP_EN); + + /* wait */ + timeout = 1000; + do { + tc_read(DP0_LTSTAT, &value); + udelay(1); + } while ((!(value & LT_LOOPDONE)) && (--timeout)); + if (timeout == 0) { + dev_err(tc->dev, "Link training timeout!\n"); + } else { + int pattern = (value >> 11) & 0x3; + int error = (value >> 8) & 0x7; + + dev_dbg(tc->dev, + "Link training phase %d done after %d uS: %s\n", + pattern, 1000 - timeout, errors[error]); + if (pattern == DP_TRAINING_PATTERN_1 && error == 0) + break; + if (pattern == DP_TRAINING_PATTERN_2) { + value &= LT_CHANNEL1_EQ_BITS | + LT_INTERLANE_ALIGN_DONE | + LT_CHANNEL0_EQ_BITS; + /* in case of two lanes */ + if ((tc->link.base.num_lanes == 2) && + (value == (LT_CHANNEL1_EQ_BITS | + LT_INTERLANE_ALIGN_DONE | + LT_CHANNEL0_EQ_BITS))) + break; + /* in case of one line */ + if ((tc->link.base.num_lanes == 1) && + (value == (LT_INTERLANE_ALIGN_DONE | + LT_CHANNEL0_EQ_BITS))) + break; + } + } + /* restart */ + tc_write(DP0CTL, 0); + usleep_range(10, 20); + } while (--retry); + if (retry == 0) { + dev_err(tc->dev, "Failed to finish training phase %d\n", + pattern); + } + + return 0; +err: + return ret; +} + +static int tc_main_link_setup(struct tc_data *tc) +{ + struct drm_dp_aux *aux = &tc->aux; + struct device *dev = tc->dev; + unsigned int rate; + u32 dp_phy_ctrl; + int timeout; + bool aligned; + bool ready; + u32 value; + int ret; + u8 tmp[8]; + + /* display mode should be set at this point */ + if (!tc->mode) + return -EINVAL; + + /* from excel file - DP0_SrcCtrl */ + tc_write(DP0_SRCCTRL, DP0_SRCCTRL_SCRMBLDIS | DP0_SRCCTRL_EN810B | + DP0_SRCCTRL_LANESKEW | DP0_SRCCTRL_LANES_2 | + DP0_SRCCTRL_BW27 | DP0_SRCCTRL_AUTOCORRECT); + /* from excel file - DP1_SrcCtrl */ + tc_write(0x07a0, 0x00003083); + + rate = clk_get_rate(tc->refclk); + switch (rate) { + case 38400000: + value = REF_FREQ_38M4; + break; + case 26000000: + value = REF_FREQ_26M; + break; + case 19200000: + value = REF_FREQ_19M2; + break; + case 13000000: + value = REF_FREQ_13M; + break; + default: + return -EINVAL; + } + value |= SYSCLK_SEL_LSCLK | LSCLK_DIV_2; + tc_write(SYS_PLLPARAM, value); + /* Setup Main Link */ + dp_phy_ctrl = BGREN | PWR_SW_EN | BIT(2) | PHY_A0_EN | PHY_M0_EN; + tc_write(DP_PHY_CTRL, dp_phy_ctrl); + msleep(100); + + /* PLL setup */ + tc_write(DP0_PLLCTRL, PLLUPDATE | PLLEN); + tc_wait_pll_lock(tc); + + tc_write(DP1_PLLCTRL, PLLUPDATE | PLLEN); + tc_wait_pll_lock(tc); + + /* PXL PLL setup */ + if (tc_test_pattern) { + ret = tc_pxl_pll_en(tc, clk_get_rate(tc->refclk), + 1000 * tc->mode->clock); + if (ret) + goto err; + } + + /* Reset/Enable Main Links */ + dp_phy_ctrl |= DP_PHY_RST | PHY_M1_RST | PHY_M0_RST; + tc_write(DP_PHY_CTRL, dp_phy_ctrl); + usleep_range(100, 200); + dp_phy_ctrl &= ~(DP_PHY_RST | PHY_M1_RST | PHY_M0_RST); + tc_write(DP_PHY_CTRL, dp_phy_ctrl); + + timeout = 1000; + do { + tc_read(DP_PHY_CTRL, &value); + udelay(1); + } while ((!(value & PHY_RDY)) && (--timeout)); + + if (timeout == 0) { + dev_err(dev, "timeout waiting for phy become ready"); + return -ETIMEDOUT; + } + + /* Set misc: 8 bits per color */ + ret = regmap_update_bits(tc->regmap, DP0_MISC, BPC_8, BPC_8); + if (ret) + goto err; + + /* + * ASSR mode + * on TC358767 side ASSR configured through strap pin + * seems there is no way to change this setting from SW + * + * check is tc configured for same mode + */ + if (tc->assr != tc->link.assr) { + dev_dbg(dev, "Trying to set display to ASSR: %d\n", + tc->assr); + /* try to set ASSR on display side */ + tmp[0] = tc->assr; + ret = drm_dp_dpcd_writeb(aux, DP_EDP_CONFIGURATION_SET, tmp[0]); + if (ret < 0) + goto err_dpcd_read; + /* read back */ + ret = drm_dp_dpcd_readb(aux, DP_EDP_CONFIGURATION_SET, tmp); + if (ret < 0) + goto err_dpcd_read; + + if (tmp[0] != tc->assr) { + dev_warn(dev, "Failed to switch display ASSR to %d, falling back to unscrambled mode\n", + tc->assr); + /* trying with disabled scrambler */ + tc->link.scrambler_dis = 1; + } + } + + /* Setup Link & DPRx Config for Training */ + ret = drm_dp_link_configure(aux, &tc->link.base); + if (ret < 0) + goto err_dpcd_write; + + /* DOWNSPREAD_CTRL */ + tmp[0] = tc->link.spread ? DP_SPREAD_AMP_0_5 : 0x00; + /* MAIN_LINK_CHANNEL_CODING_SET */ + tmp[1] = tc->link.coding8b10b ? DP_SET_ANSI_8B10B : 0x00; + ret = drm_dp_dpcd_write(aux, DP_DOWNSPREAD_CTRL, tmp, 2); + if (ret < 0) + goto err_dpcd_write; + + ret = tc_link_training(tc, DP_TRAINING_PATTERN_1); + if (ret) + goto err; + + ret = tc_link_training(tc, DP_TRAINING_PATTERN_2); + if (ret) + goto err; + + /* Clear DPCD 0x102 */ + /* Note: Can Not use DP0_SNKLTCTRL (0x06E4) short cut */ + tmp[0] = tc->link.scrambler_dis ? DP_LINK_SCRAMBLING_DISABLE : 0x00; + ret = drm_dp_dpcd_writeb(aux, DP_TRAINING_PATTERN_SET, tmp[0]); + if (ret < 0) + goto err_dpcd_write; + + /* Clear Training Pattern, set AutoCorrect Mode = 1 */ + tc_write(DP0_SRCCTRL, tc_srcctrl(tc) | DP0_SRCCTRL_AUTOCORRECT); + + /* Wait */ + timeout = 100; + do { + udelay(1); + /* Read DPCD 0x202-0x207 */ + ret = drm_dp_dpcd_read_link_status(aux, tmp + 2); + if (ret < 0) + goto err_dpcd_read; + ready = (tmp[2] == ((DP_CHANNEL_EQ_BITS << 4) | /* Lane1 */ + DP_CHANNEL_EQ_BITS)); /* Lane0 */ + aligned = tmp[4] & DP_INTERLANE_ALIGN_DONE; + } while ((--timeout) && !(ready && aligned)); + + if (timeout == 0) { + /* Read DPCD 0x200-0x201 */ + ret = drm_dp_dpcd_read(aux, DP_SINK_COUNT, tmp, 2); + if (ret < 0) + goto err_dpcd_read; + dev_info(dev, "0x0200 SINK_COUNT: 0x%02x\n", tmp[0]); + dev_info(dev, "0x0201 DEVICE_SERVICE_IRQ_VECTOR: 0x%02x\n", + tmp[1]); + dev_info(dev, "0x0202 LANE0_1_STATUS: 0x%02x\n", tmp[2]); + dev_info(dev, "0x0204 LANE_ALIGN_STATUS_UPDATED: 0x%02x\n", + tmp[4]); + dev_info(dev, "0x0205 SINK_STATUS: 0x%02x\n", tmp[5]); + dev_info(dev, "0x0206 ADJUST_REQUEST_LANE0_1: 0x%02x\n", + tmp[6]); + + if (!ready) + dev_err(dev, "Lane0/1 not ready\n"); + if (!aligned) + dev_err(dev, "Lane0/1 not aligned\n"); + return -EAGAIN; + } + + ret = tc_set_video_mode(tc, tc->mode); + if (ret) + goto err; + + /* Set M/N */ + ret = tc_stream_clock_calc(tc); + if (ret) + goto err; + + return 0; +err_dpcd_read: + dev_err(tc->dev, "Failed to read DPCD: %d\n", ret); + return ret; +err_dpcd_write: + dev_err(tc->dev, "Failed to write DPCD: %d\n", ret); +err: + return ret; +} + +static int tc_main_link_stream(struct tc_data *tc, int state) +{ + int ret; + u32 value; + + dev_dbg(tc->dev, "stream: %d\n", state); + + if (state) { + value = VID_MN_GEN | DP_EN; + if (tc->link.base.capabilities & DP_LINK_CAP_ENHANCED_FRAMING) + value |= EF_EN; + tc_write(DP0CTL, value); + /* + * VID_EN assertion should be delayed by at least N * LSCLK + * cycles from the time VID_MN_GEN is enabled in order to + * generate stable values for VID_M. LSCLK is 270 MHz or + * 162 MHz, VID_N is set to 32768 in tc_stream_clock_calc(), + * so a delay of at least 203 us should suffice. + */ + usleep_range(500, 1000); + value |= VID_EN; + tc_write(DP0CTL, value); + /* Set input interface */ + value = DP0_AUDSRC_NO_INPUT; + if (tc_test_pattern) + value |= DP0_VIDSRC_COLOR_BAR; + else + value |= DP0_VIDSRC_DPI_RX; + tc_write(SYSCTRL, value); + } else { + tc_write(DP0CTL, 0); + } + + return 0; +err: + return ret; +} + +static enum drm_connector_status +tc_connector_detect(struct drm_connector *connector, bool force) +{ + return connector_status_connected; +} + +static void tc_bridge_pre_enable(struct drm_bridge *bridge) +{ + struct tc_data *tc = bridge_to_tc(bridge); + + drm_panel_prepare(tc->panel); +} + +static void tc_bridge_enable(struct drm_bridge *bridge) +{ + struct tc_data *tc = bridge_to_tc(bridge); + int ret; + + ret = tc_main_link_setup(tc); + if (ret < 0) { + dev_err(tc->dev, "main link setup error: %d\n", ret); + return; + } + + ret = tc_main_link_stream(tc, 1); + if (ret < 0) { + dev_err(tc->dev, "main link stream start error: %d\n", ret); + return; + } + + drm_panel_enable(tc->panel); +} + +static void tc_bridge_disable(struct drm_bridge *bridge) +{ + struct tc_data *tc = bridge_to_tc(bridge); + int ret; + + drm_panel_disable(tc->panel); + + ret = tc_main_link_stream(tc, 0); + if (ret < 0) + dev_err(tc->dev, "main link stream stop error: %d\n", ret); +} + +static void tc_bridge_post_disable(struct drm_bridge *bridge) +{ + struct tc_data *tc = bridge_to_tc(bridge); + + drm_panel_unprepare(tc->panel); +} + +static bool tc_bridge_mode_fixup(struct drm_bridge *bridge, + const struct drm_display_mode *mode, + struct drm_display_mode *adj) +{ + /* Fixup sync polarities, both hsync and vsync are active low */ + adj->flags = mode->flags; + adj->flags |= (DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC); + adj->flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC); + + return true; +} + +static int tc_connector_mode_valid(struct drm_connector *connector, + struct drm_display_mode *mode) +{ + /* Accept any mode */ + return MODE_OK; +} + +static void tc_bridge_mode_set(struct drm_bridge *bridge, + struct drm_display_mode *mode, + struct drm_display_mode *adj) +{ + struct tc_data *tc = bridge_to_tc(bridge); + + tc->mode = mode; +} + +static int tc_connector_get_modes(struct drm_connector *connector) +{ + struct tc_data *tc = connector_to_tc(connector); + struct edid *edid; + unsigned int count; + + if (tc->panel && tc->panel->funcs && tc->panel->funcs->get_modes) { + count = tc->panel->funcs->get_modes(tc->panel); + if (count > 0) + return count; + } + + edid = drm_get_edid(connector, &tc->aux.ddc); + + kfree(tc->edid); + tc->edid = edid; + if (!edid) + return 0; + + drm_mode_connector_update_edid_property(connector, edid); + count = drm_add_edid_modes(connector, edid); + + return count; +} + +static void tc_connector_set_polling(struct tc_data *tc, + struct drm_connector *connector) +{ + /* TODO: add support for HPD */ + connector->polled = DRM_CONNECTOR_POLL_CONNECT | + DRM_CONNECTOR_POLL_DISCONNECT; +} + +static struct drm_encoder * +tc_connector_best_encoder(struct drm_connector *connector) +{ + struct tc_data *tc = connector_to_tc(connector); + + return tc->bridge.encoder; +} + +static const struct drm_connector_helper_funcs tc_connector_helper_funcs = { + .get_modes = tc_connector_get_modes, + .mode_valid = tc_connector_mode_valid, + .best_encoder = tc_connector_best_encoder, +}; + +static void tc_connector_destroy(struct drm_connector *connector) +{ + drm_connector_unregister(connector); + drm_connector_cleanup(connector); +} + +static const struct drm_connector_funcs tc_connector_funcs = { + .dpms = drm_atomic_helper_connector_dpms, + .fill_modes = drm_helper_probe_single_connector_modes, + .detect = tc_connector_detect, + .destroy = tc_connector_destroy, + .reset = drm_atomic_helper_connector_reset, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, +}; + +static int tc_bridge_attach(struct drm_bridge *bridge) +{ + u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; + struct tc_data *tc = bridge_to_tc(bridge); + struct drm_device *drm = bridge->dev; + int ret; + + /* Create eDP connector */ + drm_connector_helper_add(&tc->connector, &tc_connector_helper_funcs); + ret = drm_connector_init(drm, &tc->connector, &tc_connector_funcs, + DRM_MODE_CONNECTOR_eDP); + if (ret) + return ret; + + if (tc->panel) + drm_panel_attach(tc->panel, &tc->connector); + + drm_display_info_set_bus_formats(&tc->connector.display_info, + &bus_format, 1); + drm_mode_connector_attach_encoder(&tc->connector, tc->bridge.encoder); + + return 0; +} + +static const struct drm_bridge_funcs tc_bridge_funcs = { + .attach = tc_bridge_attach, + .mode_set = tc_bridge_mode_set, + .pre_enable = tc_bridge_pre_enable, + .enable = tc_bridge_enable, + .disable = tc_bridge_disable, + .post_disable = tc_bridge_post_disable, + .mode_fixup = tc_bridge_mode_fixup, +}; + +static bool tc_readable_reg(struct device *dev, unsigned int reg) +{ + return reg != SYSCTRL; +} + +static const struct regmap_range tc_volatile_ranges[] = { + regmap_reg_range(DP0_AUXWDATA(0), DP0_AUXSTATUS), + regmap_reg_range(DP0_LTSTAT, DP0_SNKLTCHGREQ), + regmap_reg_range(DP_PHY_CTRL, DP_PHY_CTRL), + regmap_reg_range(DP0_PLLCTRL, PXL_PLLCTRL), + regmap_reg_range(VFUEN0, VFUEN0), +}; + +static const struct regmap_access_table tc_volatile_table = { + .yes_ranges = tc_volatile_ranges, + .n_yes_ranges = ARRAY_SIZE(tc_volatile_ranges), +}; + +static bool tc_writeable_reg(struct device *dev, unsigned int reg) +{ + return (reg != TC_IDREG) && + (reg != DP0_LTSTAT) && + (reg != DP0_SNKLTCHGREQ); +} + +static const struct regmap_config tc_regmap_config = { + .name = "tc358767", + .reg_bits = 16, + .val_bits = 32, + .reg_stride = 4, + .max_register = PLL_DBG, + .cache_type = REGCACHE_RBTREE, + .readable_reg = tc_readable_reg, + .volatile_table = &tc_volatile_table, + .writeable_reg = tc_writeable_reg, + .reg_format_endian = REGMAP_ENDIAN_BIG, + .val_format_endian = REGMAP_ENDIAN_LITTLE, +}; + +static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct device_node *ep; + struct tc_data *tc; + int ret; + + tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL); + if (!tc) + return -ENOMEM; + + tc->dev = dev; + + /* port@2 is the output port */ + ep = of_graph_get_endpoint_by_regs(dev->of_node, 2, -1); + if (ep) { + struct device_node *remote; + + remote = of_graph_get_remote_port_parent(ep); + if (!remote) { + dev_warn(dev, "endpoint %s not connected\n", + ep->full_name); + of_node_put(ep); + return -ENODEV; + } + of_node_put(ep); + tc->panel = of_drm_find_panel(remote); + if (tc->panel) { + dev_dbg(dev, "found panel %s\n", remote->full_name); + } else { + dev_dbg(dev, "waiting for panel %s\n", + remote->full_name); + of_node_put(remote); + return -EPROBE_DEFER; + } + of_node_put(remote); + } + + /* Shut down GPIO is optional */ + tc->sd_gpio = devm_gpiod_get_optional(dev, "shutdown", GPIOD_OUT_HIGH); + if (IS_ERR(tc->sd_gpio)) + return PTR_ERR(tc->sd_gpio); + + if (tc->sd_gpio) { + gpiod_set_value_cansleep(tc->sd_gpio, 0); + usleep_range(5000, 10000); + } + + /* Reset GPIO is optional */ + tc->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(tc->reset_gpio)) + return PTR_ERR(tc->reset_gpio); + + if (tc->reset_gpio) { + gpiod_set_value_cansleep(tc->reset_gpio, 1); + usleep_range(5000, 10000); + } + + tc->refclk = devm_clk_get(dev, "ref"); + if (IS_ERR(tc->refclk)) { + ret = PTR_ERR(tc->refclk); + dev_err(dev, "Failed to get refclk: %d\n", ret); + return ret; + } + + tc->regmap = devm_regmap_init_i2c(client, &tc_regmap_config); + if (IS_ERR(tc->regmap)) { + ret = PTR_ERR(tc->regmap); + dev_err(dev, "Failed to initialize regmap: %d\n", ret); + return ret; + } + + ret = regmap_read(tc->regmap, TC_IDREG, &tc->rev); + if (ret) { + dev_err(tc->dev, "can not read device ID: %d\n", ret); + return ret; + } + + if ((tc->rev != 0x6601) && (tc->rev != 0x6603)) { + dev_err(tc->dev, "invalid device ID: 0x%08x\n", tc->rev); + return -EINVAL; + } + + tc->assr = (tc->rev == 0x6601); /* Enable ASSR for eDP panels */ + + ret = tc_aux_link_setup(tc); + if (ret) + return ret; + + /* Register DP AUX channel */ + tc->aux.name = "TC358767 AUX i2c adapter"; + tc->aux.dev = tc->dev; + tc->aux.transfer = tc_aux_transfer; + ret = drm_dp_aux_register(&tc->aux); + if (ret) + return ret; + + ret = tc_get_display_props(tc); + if (ret) + goto err_unregister_aux; + + tc_connector_set_polling(tc, &tc->connector); + + tc->bridge.funcs = &tc_bridge_funcs; + tc->bridge.of_node = dev->of_node; + ret = drm_bridge_add(&tc->bridge); + if (ret) { + dev_err(dev, "Failed to add drm_bridge: %d\n", ret); + goto err_unregister_aux; + } + + i2c_set_clientdata(client, tc); + + return 0; +err_unregister_aux: + drm_dp_aux_unregister(&tc->aux); + return ret; +} + +static int tc_remove(struct i2c_client *client) +{ + struct tc_data *tc = i2c_get_clientdata(client); + + drm_bridge_remove(&tc->bridge); + drm_dp_aux_unregister(&tc->aux); + + tc_pxl_pll_dis(tc); + + return 0; +} + +static const struct i2c_device_id tc358767_i2c_ids[] = { + { "tc358767", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, tc358767_i2c_ids); + +static const struct of_device_id tc358767_of_ids[] = { + { .compatible = "toshiba,tc358767", }, + { } +}; +MODULE_DEVICE_TABLE(of, tc358767_of_ids); + +static struct i2c_driver tc358767_driver = { + .driver = { + .name = "tc358767", + .of_match_table = tc358767_of_ids, + }, + .id_table = tc358767_i2c_ids, + .probe = tc_probe, + .remove = tc_remove, +}; +module_i2c_driver(tc358767_driver); + +MODULE_AUTHOR("Andrey Gusakov <andrey.gusakov@cogentembedded.com>"); +MODULE_DESCRIPTION("tc358767 eDP encoder driver"); +MODULE_LICENSE("GPL"); |