From: Peichen Huang PeiChen.Huang@amd.com
[ 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 --- .../gpu/drm/amd/display/dc/link/protocols/link_dp_training.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c index 751c18e592ea5..7848ddb94456c 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c @@ -1782,13 +1782,10 @@ 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);