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(-) -- 2.38.1 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
