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Revert "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS"

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This reverts commit 65e46aeaf8 which is
commit a40c5d727b upstream.

The upstream commit a40c5d727b ("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>
This commit is contained in:
Imre Deak 2025-08-28 20:49:29 +03:00 committed by Greg Kroah-Hartman
parent 6c9552de7f
commit 0699faf704
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/display/drm_dp_helper.c
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@ -663,7 +663,7 @@ ssize_t drm_dp_dpcd_read(struct drm_dp_aux *aux, unsigned int offset,
* 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;
}