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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
	dri-devel@lists.freedesktop.org,
	Aurabindo Pillai <aurabindo.pillai@amd.com>,
	amd-gfx@lists.freedesktop.org,
	Alex Deucher <alexander.deucher@amd.com>,
	Harry Wentland <Harry.Wentland@amd.com>
Subject: [PATCH AUTOSEL 5.6 130/606] drm/amd/display: Prevent dpcd reads with passive dongles
Date: Mon,  8 Jun 2020 19:04:15 -0400	[thread overview]
Message-ID: <20200608231211.3363633-130-sashal@kernel.org> (raw)
In-Reply-To: <20200608231211.3363633-1-sashal@kernel.org>

From: Aurabindo Pillai <aurabindo.pillai@amd.com>

[ Upstream commit e6142dd511425cb827b5db869f489eb81f5f994d ]

[why]
During hotplug, a DP port may be connected to the sink through
passive adapter which does not support DPCD reads. Issuing reads
without checking for this condition will result in errors

[how]
Ensure the link is in aux_mode before initiating operation that result
in a DPCD read.

Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c   | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 5e27a67fbc58..0cd11d3d4cf4 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1941,17 +1941,22 @@ amdgpu_dm_update_connector_after_detect(struct amdgpu_dm_connector *aconnector)
 		dc_sink_retain(aconnector->dc_sink);
 		if (sink->dc_edid.length == 0) {
 			aconnector->edid = NULL;
-			drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux);
+			if (aconnector->dc_link->aux_mode) {
+				drm_dp_cec_unset_edid(
+					&aconnector->dm_dp_aux.aux);
+			}
 		} else {
 			aconnector->edid =
-				(struct edid *) sink->dc_edid.raw_edid;
-
+				(struct edid *)sink->dc_edid.raw_edid;
 
 			drm_connector_update_edid_property(connector,
-					aconnector->edid);
-			drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
-					    aconnector->edid);
+							   aconnector->edid);
+
+			if (aconnector->dc_link->aux_mode)
+				drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
+						    aconnector->edid);
 		}
+
 		amdgpu_dm_update_freesync_caps(connector, aconnector->edid);
 
 	} else {
-- 
2.25.1

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  parent reply	other threads:[~2020-06-08 23:14 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200608231211.3363633-1-sashal@kernel.org>
2020-06-08 23:02 ` [PATCH AUTOSEL 5.6 035/606] drm/amd/display: add basic atomic check for cursor plane Sasha Levin
2020-06-08 23:02 ` [PATCH AUTOSEL 5.6 036/606] drm/amd/amdgpu: add raven1 part to the gfxoff quirk list Sasha Levin
2020-06-08 23:04 ` [PATCH AUTOSEL 5.6 129/606] drm/amd/display: fix counter in wait_for_no_pipes_pending Sasha Levin
2020-06-08 23:04 ` Sasha Levin [this message]
2020-06-08 23:06 ` [PATCH AUTOSEL 5.6 265/606] drm/amdgpu: drop unnecessary cancel_delayed_work_sync on PG ungate Sasha Levin
2020-06-08 23:06 ` [PATCH AUTOSEL 5.6 266/606] drm/amd/powerplay: perform PG ungate prior to CG ungate Sasha Levin
2020-06-08 23:06 ` [PATCH AUTOSEL 5.6 267/606] drm/amdgpu: Use GEM obj reference for KFD BOs Sasha Levin
2020-06-08 23:06 ` [PATCH AUTOSEL 5.6 273/606] drm/amd/amdgpu: Update update_config() logic Sasha Levin

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