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| author | Stefan Agner <stefan@agner.ch> | 2016-11-16 17:23:27 -0800 |
|---|---|---|
| committer | Stefan Agner <stefan@agner.ch> | 2016-11-28 17:33:59 -0800 |
| commit | 73fe26a48659abd2b85d2f87d3cf2400ddb313d7 (patch) | |
| tree | 0fec4e00c098389ce769208b7ccbae607e4fb67b /drivers/gpu/drm/fsl-dcu | |
| parent | c162215f570567b3a264d8e1abb50971d78bbaf3 (diff) | |
| download | linux-stable-73fe26a48659abd2b85d2f87d3cf2400ddb313d7.tar.gz linux-stable-73fe26a48659abd2b85d2f87d3cf2400ddb313d7.tar.bz2 linux-stable-73fe26a48659abd2b85d2f87d3cf2400ddb313d7.zip | |
drm/fsl-dcu: introduce kernel parameter to specify fbdev depth
Add a kernel parameter legancyfb_depth (like the i.MX drm driver)
to control the legancy fbdev depth. Default to the so far hard
coded depth of 24-bit. Currently changing the framebuffer depth
is not possible from user space when using the fbdev emulation
layer... This provides a rudimentary mechanism to change depth
without having to change kernel code.
Signed-off-by: Stefan Agner <stefan@agner.ch>
Diffstat (limited to 'drivers/gpu/drm/fsl-dcu')
| -rw-r--r-- | drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c index 736451616ce4..58ccacaf5a4e 100644 --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c @@ -32,6 +32,9 @@ #include "fsl_dcu_drm_drv.h" #include "fsl_tcon.h" +static int legacyfb_depth = 24; +module_param(legacyfb_depth, int, 0444); + static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg) { if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE) @@ -87,7 +90,18 @@ static int fsl_dcu_load(struct drm_device *dev, unsigned long flags) goto done; dev->irq_enabled = true; - fsl_dev->fbdev = drm_fbdev_cma_init(dev, 24, 1, 1); + if (legacyfb_depth != 16 && legacyfb_depth != 24 && + legacyfb_depth != 32) { + dev_warn(dev->dev, + "Invalid legacyfb_depth. Defaulting to 24bpp\n"); + legacyfb_depth = 24; + } + fsl_dev->fbdev = drm_fbdev_cma_init(dev, legacyfb_depth, 1, 1); + if (IS_ERR(fsl_dev->fbdev)) { + ret = PTR_ERR(fsl_dev->fbdev); + fsl_dev->fbdev = NULL; + goto done; + } return 0; done: |