On Mon, May 10, 2021 at 03:33:46PM +0200, Werner Sembach wrote: > When encoder validation of a display mode fails, retry with less bandwidth > heavy YCbCr420 color mode, if available. This enables some HDMI 1.4 setups > to support 4k60Hz output, which previously failed silently. > > AMDGPU had nearly the exact same issue. This problem description is > therefore copied from my commit message of the AMDGPU patch. > > On some setups, while the monitor and the gpu support display modes with > pixel clocks of up to 600MHz, the link encoder might not. This prevents > YCbCr444 and RGB encoding for 4k60Hz, but YCbCr420 encoding might still be > possible. However, which color mode is used is decided before the link > encoder capabilities are checked. This patch fixes the problem by retrying > to find a display mode with YCbCr420 enforced and using it, if it is > valid. > > This patchset is revision 7. Fixed a rebase issue in 1/3 and moved message > from error output to debug output in 2/3. Looks good and CI seem shappy. Series pushed to drm-intel-next. Thanks. -- Ville Syrjälä Intel
