tmakin/ack-tegra
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

drm/amd/display: not abort link train when bw is low

Browse Source 
[ Upstream commit 8a21da2842bb22b2b80e5902d0438030d729bfd3 ]

[WHY]
DP tunneling should not abort link train even bandwidth become
too low after downgrade. Otherwise, it would fail compliance test.

[HOW}
Do link train with downgrade settings even bandwidth is not enough

Reviewed-by: Cruise Hung <cruise.hung@amd.com>
Reviewed-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: Peichen Huang <PeiChen.Huang@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Peichen Huang
2025-02-25 14:52:30 +08:00
committed by Greg Kroah-Hartman
parent 83e4f1de08
commit ed7eda66b2
1 changed files with 1 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c
View File

@@ -1769,13 +1769,10 @@ bool perform_link_training_with_retries(
is_link_bw_min = ((cur_link_settings.link_rate <= LINK_RATE_LOW) &&
(cur_link_settings.lane_count <= LANE_COUNT_ONE));
if (is_link_bw_low) {
if (is_link_bw_low)
DC_LOG_WARNING(
"%s: Link(%d) bandwidth too low after fallback req_bw(%d) > link_bw(%d)\n",
__func__, link->link_index, req_bw, link_bw);
return false;
}
}
msleep(delay_between_attempts);