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drm/xe/display: Avoid encoder_suspend at runtime suspend

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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: b1d90a862c ("drm/xe: Use the encoder suspend helper also used by the i915 driver")
Cc: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240830183507.298351-2-rodrigo.vivi@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Rodrigo Vivi 2024-08-30 14:35:07 -04:00
parent bc947d9a8c
commit 8da19441d0
No known key found for this signature in database
GPG Key ID: FA625F640EEB13CA
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/xe/display/xe_display.c
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@ -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);