[PATCH 2/2] drm/xe/display: Avoid encoder_suspend at runtime suspend

[Rodrigo Vivi]

Fix circular locking dependency on runtime suspend.

<4> [74.952215] ======================================================
<4> [74.952217] WARNING: possible circular locking dependency detected
<4> [74.952219] 6.10.0-rc7-xe #1 Not tainted
<4> [74.952221] ------------------------------------------------------
<4> [74.952223] kworker/7:1/82 is trying to acquire lock:
<4> [74.952226] ffff888120548488 (&dev->mode_config.mutex){+.+.}-{3:3}, at: drm_modeset_lock_all+0x40/0x1e0 [drm]
<4> [74.952260]
but task is already holding lock:
<4> [74.952262] ffffffffa0ae59c0 (xe_pm_runtime_lockdep_map){+.+.}-{0:0}, at: xe_pm_runtime_suspend+0x2f/0x340 [xe]
<4> [74.952322]
which lock already depends on the new lock.

The commit b1d90a86 ("drm/xe: Use the encoder suspend helper also used
by the i915 driver") didn't do anything wrong. It actually fixed a
critical bug, because the encoder_suspend was never getting actually
called because it was returning if (has_display(xe)) instead of
if (!has_display(xe)). However, this ended up introducing the encoder
suspend calls in the runtime routines as well, causing the circular
locking dependency.

Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2304
Fixes: b1d90a862c89 ("drm/xe: Use the encoder suspend helper also used by the i915 driver")
Cc: Imre Deak <imre.deak at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/xe/display/xe_display.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/xe/display/xe_display.c b/drivers/gpu/drm/xe/display/xe_display.c
index ae92012253f8..75736faf2a80 100644
--- a/drivers/gpu/drm/xe/display/xe_display.c
+++ b/drivers/gpu/drm/xe/display/xe_display.c
@@ -345,10 +345,10 @@ void xe_display_pm_suspend(struct xe_device *xe, bool runtime)
 
 	intel_hpd_cancel_work(xe);
 
-	if (!runtime && has_display(xe))
+	if (!runtime && has_display(xe)) {
 		intel_display_driver_suspend_access(xe);
-
-	intel_encoder_suspend_all(&xe->display);
+		intel_encoder_suspend_all(&xe->display);
+	}
 
 	intel_opregion_suspend(display, s2idle ? PCI_D1 : PCI_D3cold);
 
-- 
2.46.0