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* [Intel-gfx] [PATCH v1] drm/i915: Minor link training logic fixes for dp_mst
@ 2020-05-27 20:00 Stanislav Lisovskiy
  2020-05-27 20:26 ` Imre Deak
                   ` (3 more replies)
  0 siblings, 4 replies; 8+ messages in thread
From: Stanislav Lisovskiy @ 2020-05-27 20:00 UTC (permalink / raw)
  To: intel-gfx

First of all *_needs_link_retraining function should return
false is link_train is set to true but not false.

Also if we detect channel eq problem when checking mst status
we simply bail out, without setting link_train to false again,
which might end up in a situation that we don't do link retraining
when needed.

There were some issues, when we had several problems with dp mst
and at the same time the log was floode by messages about
"channel eq not ok, need retraining" however the actual training
seems to be never done.

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 1768731678a1..9288dc1f8914 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -5627,6 +5627,7 @@ intel_dp_check_mst_status(struct intel_dp *intel_dp)
 			drm_dbg_kms(&i915->drm,
 				    "channel EQ not ok, retraining\n");
 			need_retrain = true;
+			intel_dp->link_trained = false;
 		}
 
 		drm_dbg_kms(&i915->drm, "got esi %3ph\n", esi);
@@ -5654,7 +5655,7 @@ intel_dp_needs_link_retrain(struct intel_dp *intel_dp)
 {
 	u8 link_status[DP_LINK_STATUS_SIZE];
 
-	if (!intel_dp->link_trained)
+	if (intel_dp->link_trained)
 		return false;
 
 	/*
-- 
2.24.1.485.gad05a3d8e5

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^ permalink raw reply related	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2020-05-28  7:32 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-05-27 20:00 [Intel-gfx] [PATCH v1] drm/i915: Minor link training logic fixes for dp_mst Stanislav Lisovskiy
2020-05-27 20:26 ` Imre Deak
2020-05-27 20:49   ` Imre Deak
2020-05-27 21:12     ` Imre Deak
2020-05-27 20:54 ` Manasi Navare
2020-05-28  7:28   ` Lisovskiy, Stanislav
2020-05-27 21:17 ` [Intel-gfx] ✓ Fi.CI.BAT: success for " Patchwork
2020-05-27 23:49 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork

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