[0/3] drm/format-helper: Support conversion to XRGB8888

Message

Thomas Zimmermann April 21, 2022, 6:17 p.m. UTC

(resending with dri-devel in cc)

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.

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: d97978df553d768e457cb68c637b2b0a6188b87c