tree 8dd53d78c3d953d14264b79fdd7cb321a36ce057
parent a6311be8f062db5fe93a08a3722fae53a58f2499
author Mikita Lipski <mikita.lipski@amd.com> 1530739676 -0400
committer Alex Deucher <alexander.deucher@amd.com> 1530803993 -0500

drm/amd/display: add a check for display depth validity

[why]
HDMI 2.0 fails to validate 4K@60 timing with 10 bpc
[how]
Adding a helper function that would verify if the display depth
assigned would pass a bandwidth validation.
Drop the display depth by one level till calculated pixel clk
is lower than maximum TMDS clk.

Bugzilla: https://bugs.freedesktop.org/106959

Tested-by: Mike Lothian <mike@fireburn.co.uk>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>