6.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: Khaled Almahallawy <khaled.almahallawy@xxxxxxxxx>
[ Upstream commit 5e4c16fe08c8b894b258f4110349dc9b642669f9 ]
Currently, with MFD/pin assignment D, the driver clears the pipe reset bit
of lane 1 which is not owned by display. This causes the display
to block S0iX.
By not clearing this bit for lane 1 and keeping whatever default, S0ix
started to work. This is already what the driver does at the end
of the phy lane reset sequence (Step#8)
Bspec: 65451
Fixes: 619a06dba6fa ("drm/i915/mtl: Reset only one lane in case of MFD")
Cc: Mika Kahola <mika.kahola@xxxxxxxxx>
Cc: Gustavo Sousa <gustavo.sousa@xxxxxxxxx>
Signed-off-by: Khaled Almahallawy <khaled.almahallawy@xxxxxxxxx>
Reviewed-by: Gustavo Sousa <gustavo.sousa@xxxxxxxxx>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20231005001310.154396-1-khaled.almahallawy@xxxxxxxxx
(cherry picked from commit 4a07f063d20c46524f00976f4537de72d9f31c4e)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_cx0_phy.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
index 719447ce86e70..974dd52e720c1 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
@@ -2554,8 +2554,7 @@ static void intel_cx0_phy_lane_reset(struct drm_i915_private *i915,
drm_warn(&i915->drm, "PHY %c failed to bring out of SOC reset after %dus.\n",
phy_name(phy), XELPDP_PORT_BUF_SOC_READY_TIMEOUT_US);
- intel_de_rmw(i915, XELPDP_PORT_BUF_CTL2(port),
- XELPDP_LANE_PIPE_RESET(0) | XELPDP_LANE_PIPE_RESET(1),
+ intel_de_rmw(i915, XELPDP_PORT_BUF_CTL2(port), lane_pipe_reset,
lane_pipe_reset);
if (__intel_de_wait_for_register(i915, XELPDP_PORT_BUF_CTL2(port),
--
2.42.0
