[SRU][Q][PATCH 2/2] drm/i915/psr: Check PSR pause counter in __psr_wait_for_idle_locked

[AceLan Kao]

From: Jouni Högander <jouni.hogander at intel.com>

BugLink: https://bugs.launchpad.net/bugs/2130998

PSR work is using __psr_wait_for_idle_locked to ensure PSR exit is
completed before continuing to PSR activation. __psr_wait_for_idle_locked
is unlocking PSR mutex which allows PSR disable/enable and PSR
pause/resume while PSR idle is being wait. PSR enable status is already
checked after locking again PSR mutex but PSR pause counter check is
missing. Due to this PSR work may continue to PSR activation even PSR is
paused.

Fix this by checking PSR pause counter in __psr_wait_for_idle_locked after
PSR mutex is locked again.

Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
Reviewed-by: Jeevan B <jeevan.b at intel.com>
Link: https://lore.kernel.org/r/20250826074457.1992524-1-jouni.hogander@intel.com
(cherry picked from commit 61a0ef5921d603e64beef12f4a3bf7bfde409f18)
Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao at canonical.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 9142a8bbcc058..fced0422dae66 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -3100,7 +3100,7 @@ static bool __psr_wait_for_idle_locked(struct intel_dp *intel_dp)
 
 	/* After the unlocked wait, verify that PSR is still wanted! */
 	mutex_lock(&intel_dp->psr.lock);
-	return err == 0 && intel_dp->psr.enabled;
+	return err == 0 && intel_dp->psr.enabled && !intel_dp->psr.pause_counter;
 }
 
 static int intel_psr_fastset_force(struct intel_display *display)
-- 
2.43.0