drm/amd/display: fix read errors pertaining to dp_lttpr_status_show()

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Currently, it is likely that we will read the relevant LTTPR caps after
link training has completed (which can cause garbage data to be read),
however according to the DP 2.0 spec that should be done before link
training has commenced. So, instead of reading the registers on demand,
use the values provided to us by DC.

Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Hamza Mahfooz 2023-02-03 10:04:11 -05:00 • committed by Alex Deucher

parent ad1cebb6f0

commit 642f1b4052

1 changed files with 22 additions and 50 deletions

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drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c

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