Support conversion from RGB565 and RGB888 to XRGB8888. This enables simpledrm to work with framebuffers of such formats.
UEFI and/or Grub will usually set 32-bit output in XRGB8888 format. The issue can be reproduced by enabling simpledrm and requesting a console framebuffer of different format on the kernel command line; for example
nomodeset video=1024x768-16
or
nomodeset video=1024x768-24
Conversion helpers will do nothing in this case.
Make this work by implementing the rsp conversion helpers. Also add a warning about unsupported format conversions. The patchset should also enable odd userspace configurations, such as running Xorg with 16- or 24-bit color depth.
v2: * use helpers for struct drm_rect (Javier) * improve commit messages (Javier)
Thomas Zimmermann (3): drm/format-helper: Print warning on missing format conversion drm/format-helper: Add RGB888-to-XRGB8888 conversion drm/format-helper: Add RGB565-to-XRGB8888 conversion
drivers/gpu/drm/drm_format_helper.c | 95 +++++++++++++++++++++++++++++ 1 file changed, 95 insertions(+)
base-commit: 0e7deff6446a4ba2c75f499a0bfa80cd6a15c129 prerequisite-patch-id: c2b2f08f0eccc9f5df0c0da49fa1d36267deb11d prerequisite-patch-id: c67e5d886a47b7d0266d81100837557fda34cb24