This reverts commit 3c778a98bee16b4c7ba364a0101ee3c399a95b85.
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: [email protected]
Cc: [email protected]
Cc: Sasha Levin <[email protected]>
Link: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14558
Signed-off-by: Imre Deak <[email protected]>
---
drivers/gpu/drm/display/drm_dp_helper.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/display/drm_dp_helper.c
b/drivers/gpu/drm/display/drm_dp_helper.c
index bb61bbdcce5b..9fa13da513d2 100644
--- a/drivers/gpu/drm/display/drm_dp_helper.c
+++ b/drivers/gpu/drm/display/drm_dp_helper.c
@@ -664,7 +664,7 @@ 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;
}
--
2.49.1
