[PATCH 0/7] drm: Fix the color-depth/bpp confusion

[Thomas Zimmermann]

A number of drivers mix up the meaning of bits-per-pixel and color
depth. For each of them, set the correct values. As a rule of thumb,
the color depth is the number of color and alpha bits that affect
image composition. The bpp value is the color depth in the pixel
plus the filler bits.

The color depth is exported to userspace, while the bpp value only
affects fbdev emulation. Currently, fbdev fails if it selects a color
format that is unsupported by the driver. The fix would be to fall
back to a driver default value for the bpp. Getting the default fixed
in drivers will then allow us to fix the fbdev format selection.

Thomas Zimmermann (7):
  drm/hisilicon/hibmc: Fix preferred depth and bpp
  drm/logicvc: Fix preferred fbdev cpp
  drm/cirrus: Decouple fbdev bpp value from color depth
  drm/ofdrm: Set preferred depth from format of scanout buffer
  drm/simpledrm: Set preferred depth from format of scanout buffer
  drm/solomon: Set preferred color depth and bpp to the correct values
  drm/fb-helper: Don't use the preferred depth for the BPP default

 drivers/gpu/drm/drm_fbdev_generic.c             | 15 +++++++++------
 drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c |  4 ++--
 drivers/gpu/drm/logicvc/logicvc_drm.c           | 14 +++++++++++++-
 drivers/gpu/drm/solomon/ssd130x.c               |  4 ++--
 drivers/gpu/drm/tiny/cirrus.c                   |  2 +-
 drivers/gpu/drm/tiny/ofdrm.c                    | 13 +------------
 drivers/gpu/drm/tiny/simpledrm.c                |  4 ++--
 7 files changed, 30 insertions(+), 26 deletions(-)

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2.38.1