[SRU][O][PATCH 2/3] drm/xe/display: Separate the d3cold and non-d3cold runtime PM handling

[Thibault Ferrante]

From: Imre Deak <imre.deak at intel.com>

BugLink: https://bugs.launchpad.net/bugs/2102378

For clarity separate the d3cold and non-d3cold runtime PM handling. The
only change in behavior is disabling polling later during runtime
resume. This shouldn't make a difference, since the poll disabling is
handled from a work, which could run at any point wrt. the runtime
resume handler. The work will also require a runtime PM reference,
syncing it with the resume handler.

Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt at intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241009194358.1321200-4-imre.deak@intel.com
(backported from commit a4de6beb83fc5adee788518350247c629568901e)
[thibf: intel_opregion_resume() takes xe as argument instead of display]
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
Signed-off-by: Thibault Ferrante <thibault.ferrante at canonical.com>
---
 drivers/gpu/drm/xe/display/xe_display.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/xe/display/xe_display.c b/drivers/gpu/drm/xe/display/xe_display.c
index 04e99d1beb21..b011a1e3ffa3 100644
--- a/drivers/gpu/drm/xe/display/xe_display.c
+++ b/drivers/gpu/drm/xe/display/xe_display.c
@@ -337,6 +337,9 @@ static void __xe_display_pm_suspend(struct xe_device *xe, bool runtime)
 	intel_opregion_suspend(xe, s2idle ? PCI_D1 : PCI_D3cold);
 
 	intel_dmc_suspend(xe);
+
+	if (runtime && has_display(xe))
+		intel_hpd_poll_enable(xe);
 }
 
 void xe_display_pm_suspend(struct xe_device *xe)
@@ -349,8 +352,10 @@ void xe_display_pm_runtime_suspend(struct xe_device *xe)
 	if (!xe->info.enable_display)
 		return;
 
-	if (xe->d3cold.allowed)
+	if (xe->d3cold.allowed) {
 		__xe_display_pm_suspend(xe, true);
+		return;
+	}
 
 	intel_hpd_poll_enable(xe);
 }
@@ -398,9 +403,11 @@ static void __xe_display_pm_resume(struct xe_device *xe, bool runtime)
 		intel_display_driver_resume(xe);
 		drm_kms_helper_poll_enable(&xe->drm);
 		intel_display_driver_enable_user_access(xe);
-		intel_hpd_poll_disable(xe);
 	}
 
+	if (has_display(xe))
+		intel_hpd_poll_disable(xe);
+
 	intel_opregion_resume(xe);
 
 	intel_fbdev_set_suspend(&xe->drm, FBINFO_STATE_RUNNING, false);
@@ -418,10 +425,12 @@ void xe_display_pm_runtime_resume(struct xe_device *xe)
 	if (!xe->info.enable_display)
 		return;
 
-	intel_hpd_poll_disable(xe);
-
-	if (xe->d3cold.allowed)
+	if (xe->d3cold.allowed) {
 		__xe_display_pm_resume(xe, true);
+		return;
+	}
+
+	intel_hpd_poll_disable(xe);
 }
 
 
-- 
2.45.2