drm/xe/display: Do not suspend resume dp mst during runtime

Remove intel_dp_mst_suspend/resume from runtime suspend resume
sequences. It is incorrect as it depends on AUX transfers which
itself depend on the device being runtime resumed. This is
also why we see a lock_dep splat here.

<4> [76.011119] kworker/4:2/192 is trying to acquire lock:
<4> [76.011122] ffff8881120b3210 (&mgr->lock#2){+.+.}-{3:3}, at:
drm_dp_mst_topology_mgr_suspend+0x33/0xd0 [drm_display_helper]
<4> [76.011142]
but task is already holding lock:
<4> [76.011144] ffffffffa0bc3420
(xe_pm_runtime_lockdep_map){+.+.}-{0:0}, at:
xe_pm_runtime_suspend+0x51/0x3f0 [xe]
<4> [76.011223]
which lock already depends on the new lock.
<4> [76.011226]
the existing dependency chain (in reverse order) is:
<4> [76.011229]
-> #2 (xe_pm_runtime_lockdep_map){+.+.}-{0:0}:
<4> [76.011233]        pm_runtime_lockdep_prime+0x2f/0x50 [xe]
<4> [76.011306]        xe_pm_runtime_resume_and_get+0x29/0x90 [xe]
<4> [76.011377]        intel_display_power_get+0x24/0x70 [xe]
<4> [76.011466]        intel_digital_port_connected_locked+0x4c/0xf0
[xe]
<4> [76.011551]        intel_dp_aux_xfer+0xb8/0x7c0 [xe]
<4> [76.011633]        intel_dp_aux_transfer+0x166/0x2e0 [xe]
<4> [76.011715]        drm_dp_dpcd_access+0x87/0x150
[drm_display_helper]
<4> [76.011726]        drm_dp_dpcd_probe+0x3d/0xf0 [drm_display_helper]
<4> [76.011737]        drm_dp_dpcd_read+0xdd/0x130 [drm_display_helper]
<4> [76.011747]        intel_dp_get_colorimetry_status+0x3a/0x70 [xe]
<4> [76.011886]        intel_dp_init_connector+0x4ff/0x1030 [xe]
<4> [76.011969]        intel_ddi_init+0xc5b/0x1030 [xe]
<4> [76.012058]        intel_bios_for_each_encoder+0x36/0x60 [xe]
<4> [76.012145]        intel_setup_outputs+0x201/0x460 [xe]
<4> [76.012233]        intel_display_driver_probe_nogem+0x155/0x1e0 [xe]
<4> [76.012320]        xe_display_init_noaccel+0x27/0x70 [xe]

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240912012545.702032-2-suraj.kandpal@intel.com

diff --git a/drivers/gpu/drm/xe/display/xe_display.c b/drivers/gpu/drm/xe/display/xe_display.c
index 10d707e..cdfc87b 100644 (file)
--- a/drivers/gpu/drm/xe/display/xe_display.c
+++ b/drivers/gpu/drm/xe/display/xe_display.c
@@ -342,7 +342,8 @@ void xe_display_pm_suspend(struct xe_device *xe, bool runtime)
 
        xe_display_flush_cleanup_work(xe);
 
-       intel_dp_mst_suspend(xe);
+       if (!runtime)
+               intel_dp_mst_suspend(xe);
 
        intel_hpd_cancel_work(xe);
 
@@ -407,7 +408,9 @@ void xe_display_pm_resume(struct xe_device *xe, bool runtime)
                intel_display_driver_resume_access(xe);
 
        /* MST sideband requires HPD interrupts enabled */
-       intel_dp_mst_resume(xe);
+       if (!runtime)
+               intel_dp_mst_resume(xe);
+
        if (!runtime && has_display(xe)) {
                intel_display_driver_resume(xe);
                drm_kms_helper_poll_enable(&xe->drm);