drm/xe/display: Match i915 driver suspend/resume sequences better

Suspend fbdev sooner, and disable user access before suspending to
prevent some races. I've noticed this when comparing xe suspend to
i915's.

Matches the following commits from i915:
24b412b ("drm/i915: Disable intel HPD poll after DRM poll init/enable")
1ef28d8 ("drm/i915: Suspend the framebuffer console earlier during system suspend")
bd738d8 ("drm/i915: Prevent modesets during driver init/shutdown")

Thanks to Imre for pointing me to those commits.

Driver shutdown is currently missing, but I have some idea how to
implement it next.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240806105044.596842-2-maarten.lankhorst@linux.intel.com
Signed-off-by: Maarten Lankhorst,,, <maarten.lankhorst@linux.intel.com>

drivers/gpu/drm/xe/display/xe_display.c

@@ -299,8 +299,11 @@ void xe_display_pm_suspend(struct xe_device *xe, bool runtime)
 	 * properly.
 	 */
 	intel_power_domains_disable(xe);
-	if (has_display(xe))
+	intel_fbdev_set_suspend(&xe->drm, FBINFO_STATE_SUSPENDED, true);
+	if (has_display(xe)) {
 		drm_kms_helper_poll_disable(&xe->drm);
+		intel_display_driver_disable_user_access(xe);
+	}
 
 	if (!runtime)
 		intel_display_driver_suspend(xe);
@@ -309,12 +312,13 @@ void xe_display_pm_suspend(struct xe_device *xe, bool runtime)
 
 	intel_hpd_cancel_work(xe);
 
+	if (has_display(xe))
+		intel_display_driver_suspend_access(xe);
+
 	intel_encoder_suspend_all(&xe->display);
 
 	intel_opregion_suspend(display, s2idle ? PCI_D1 : PCI_D3cold);
 
-	intel_fbdev_set_suspend(&xe->drm, FBINFO_STATE_SUSPENDED, true);
-
 	intel_dmc_suspend(xe);
 }
 
@@ -354,14 +358,19 @@ void xe_display_pm_resume(struct xe_device *xe, bool runtime)
 	intel_display_driver_init_hw(xe);
 	intel_hpd_init(xe);
 
+	if (has_display(xe))
+		intel_display_driver_resume_access(xe);
+
 	/* MST sideband requires HPD interrupts enabled */
 	intel_dp_mst_resume(xe);
 	if (!runtime)
 		intel_display_driver_resume(xe);
 
-	intel_hpd_poll_disable(xe);
-	if (has_display(xe))
+	if (has_display(xe)) {
 		drm_kms_helper_poll_enable(&xe->drm);
+		intel_display_driver_enable_user_access(xe);
+	}
+	intel_hpd_poll_disable(xe);
 
 	intel_opregion_resume(display);