From: <gregkh@linuxfoundation.org>
To: dri-devel@lists.freedesktop.org, gregkh@linuxfoundation.org,
imre.deak@intel.com, intel-gfx@lists.freedesktop.org,
sashal@kernel.org
Cc: <stable-commits@vger.kernel.org>
Subject: Patch "Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS"" has been added to the 6.6-stable tree
Date: Tue, 02 Sep 2025 14:28:56 +0200 [thread overview]
Message-ID: <2025090256-pleading-removing-21f6@gregkh> (raw)
This is a note to let you know that I've just added the patch titled
Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS"
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
revert-drm-dp-change-aux-dpcd-probe-address-from-dpcd_rev-to-lane0_1_status.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
From imre.deak@intel.com Tue Sep 2 13:50:59 2025
From: Imre Deak <imre.deak@intel.com>
Date: Thu, 28 Aug 2025 20:49:29 +0300
Subject: Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS"
To: <stable@vger.kernel.org>
Cc: <intel-gfx@lists.freedesktop.org>, <dri-devel@lists.freedesktop.org>, Sasha Levin <sashal@kernel.org>
From: Imre Deak <imre.deak@intel.com>
This reverts commit 65e46aeaf84aa88539bcff6b8077e05fbd0700da which is
commit a40c5d727b8111b5db424a1e43e14a1dcce1e77f upstream.
The upstream commit a40c5d727b8111b5db424a1e43e14a1dcce1e77f ("drm/dp:
Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS") the
reverted commit backported causes a regression, on one eDP panel at
least resulting in display flickering, described in detail at the Link:
below. The issue fixed by the upstream commit will need a different
solution, revert the backport for now.
Cc: intel-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Cc: Sasha Levin <sashal@kernel.org>
Link: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14558
Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/display/drm_dp_helper.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/display/drm_dp_helper.c
+++ b/drivers/gpu/drm/display/drm_dp_helper.c
@@ -663,7 +663,7 @@ ssize_t drm_dp_dpcd_read(struct drm_dp_a
* monitor doesn't power down exactly after the throw away read.
*/
if (!aux->is_remote) {
- ret = drm_dp_dpcd_probe(aux, DP_LANE0_1_STATUS);
+ ret = drm_dp_dpcd_probe(aux, DP_DPCD_REV);
if (ret < 0)
return ret;
}
Patches currently in stable-queue which might be from imre.deak@intel.com are
queue-6.6/revert-drm-dp-change-aux-dpcd-probe-address-from-dpcd_rev-to-lane0_1_status.patch
reply other threads:[~2025-09-02 12:29 UTC|newest]
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