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| author | Kuogee Hsieh <quic_khsieh@quicinc.com> | 2022-01-18 21:47:28 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-08 15:23:32 +0300 |
| commit | 740d2330760e710240c9d89e191686a1d148dda2 (patch) | |
| tree | ae56feb8a795835b3111f33a756499be61f094a5 | |
| parent | 9525b8bcae8b99188990b56484799cf4b1b43786 (diff) | |
| download | linux-740d2330760e710240c9d89e191686a1d148dda2.tar.xz | |
drm/msm/dp: stop link training after link training 2 failed
[ Upstream commit 9051d629dbf7a998a40f7eac65a9512b01bc3bb8 ]
Each DP link training contains link training 1 followed by link
training 2. There is maximum of 5 retries of DP link training
before declared link training failed. It is required to stop link
training at end of link training 2 if it is failed so that next
link training 1 can start freshly. This patch fixes link compliance
test case 4.3.1.13 (Source Device Link Training EQ Fallback Test).
Changes in v10:
-- group into one series
Changes in v11:
-- drop drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read
Fixes: 2e0adc765d88 ("drm/msm/dp: do not end dp link training until video is ready")
Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/1642531648-8448-5-git-send-email-quic_khsieh@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/gpu/drm/msm/dp/dp_ctrl.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index 62e75dc8afc6..4af281d97493 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -1744,6 +1744,9 @@ int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl) /* end with failure */ break; /* lane == 1 already */ } + + /* stop link training before start re training */ + dp_ctrl_clear_training_pattern(ctrl); } } |