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

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[ Upstream commit a40c5d727b ]

Reading DPCD registers has side-effects in general. In particular
accessing registers outside of the link training register range
(0x102-0x106, 0x202-0x207, 0x200c-0x200f, 0x2216) is explicitly
forbidden by the DP v2.1 Standard, see

3.6.5.1 DPTX AUX Transaction Handling Mandates
3.6.7.4 128b/132b DP Link Layer LTTPR Link Training Mandates

Based on my tests, accessing the DPCD_REV register during the link
training of an UHBR TBT DP tunnel sink leads to link training failures.

Solve the above by using the DP_LANE0_1_STATUS (0x202) register for the
DPCD register access quirk.

Cc: <stable@vger.kernel.org>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://lore.kernel.org/r/20250605082850.65136-2-imre.deak@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Imre Deak 2025-08-23 09:16:59 -04:00 committed by Greg Kroah-Hartman
parent 48b5547d89
commit 4f546a7767
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_DPCD_REV);
ret = drm_dp_dpcd_probe(aux, DP_LANE0_1_STATUS);
if (ret < 0)
return ret;
}