drm/amd/display: Fix takover from VGA mode
HW Engineer's Notes: During switch from vga->extended, if we set the VGA_TEST_ENABLE and then hit the VGA_TEST_RENDER_START, then the DCHUBP timing gets updated correctly. Then vBIOS will have it poll for the VGA_TEST_RENDER_DONE and unset VGA_TEST_ENABLE, to leave it in the same state as before. Signed-off-by:Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Reviewed-by:
Tony Cheng <Tony.Cheng@amd.com> Acked-by:
Harry Wentland <harry.wentland@amd.com> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com>
parent
9fe8f03b
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