[RFC 5/6] drm/xe/pm: D3Cold target state

[Anshuman Gupta <anshuman.gupta@intel.com>]

Trade-off D3Cold target state based upon current vram usages.
if vram usages is greater then vram_d3cold_threshold and GPU
has display connected then target D3Cold state is D3Cold-VRSR
otherwise target state is D3COLD-Off.

Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
---
 drivers/gpu/drm/xe/display/xe_display.c | 22 ++++++++++++++++++++++
 drivers/gpu/drm/xe/display/xe_display.h |  1 +
 drivers/gpu/drm/xe/xe_pm.c              | 12 ++++++++++++
 3 files changed, 35 insertions(+)

diff --git a/drivers/gpu/drm/xe/display/xe_display.c b/drivers/gpu/drm/xe/display/xe_display.c
index 02a413a07382..140a43d6b1b6 100644
--- a/drivers/gpu/drm/xe/display/xe_display.c
+++ b/drivers/gpu/drm/xe/display/xe_display.c
@@ -548,3 +548,25 @@ int xe_display_probe(struct xe_device *xe)
 	unset_display_features(xe);
 	return 0;
 }
+
+bool xe_display_connected(struct xe_device *xe)
+{
+	struct drm_connector *list_connector;
+	struct drm_connector_list_iter iter;
+	bool ret = false;
+
+	mutex_lock(&xe->drm.mode_config.mutex);
+	drm_connector_list_iter_begin(&xe->drm, &iter);
+
+	drm_for_each_connector_iter(list_connector, &iter) {
+		if (list_connector->status == connector_status_connected) {
+			ret = true;
+			break;
+		}
+	}
+
+	drm_connector_list_iter_end(&iter);
+	mutex_unlock(&xe->drm.mode_config.mutex);
+
+	return ret;
+}
diff --git a/drivers/gpu/drm/xe/display/xe_display.h b/drivers/gpu/drm/xe/display/xe_display.h
index 685dc74402fb..c6bc54323084 100644
--- a/drivers/gpu/drm/xe/display/xe_display.h
+++ b/drivers/gpu/drm/xe/display/xe_display.h
@@ -40,6 +40,7 @@ void xe_display_pm_resume(struct xe_device *xe);
 void xe_display_pm_runtime_suspend(struct xe_device *xe);
 void xe_display_pm_runtime_suspend_late(struct xe_device *xe);
 void xe_display_pm_runtime_resume(struct xe_device *xe);
+bool xe_display_connected(struct xe_device *xe);
 
 #else
 
diff --git a/drivers/gpu/drm/xe/xe_pm.c b/drivers/gpu/drm/xe/xe_pm.c
index 81e67b5693dc..6d28aedcb062 100644
--- a/drivers/gpu/drm/xe/xe_pm.c
+++ b/drivers/gpu/drm/xe/xe_pm.c
@@ -198,6 +198,14 @@ static void xe_rpm_lockmap_release(const struct xe_device *xe)
 			 &xe_pm_runtime_d3cold_map);
 }
 
+static void xe_pm_suspend_prepare(struct xe_device *xe)
+{
+	if (pm_suspend_target_state == PM_SUSPEND_TO_IDLE)
+		xe_pm_d3cold_allowed_toggle(xe);
+	else
+		xe->d3cold.allowed = XE_D3COLD_OFF;
+}
+
 /**
  * xe_pm_suspend - Helper for System suspend, i.e. S0->S3 / S0->S2idle
  * @xe: xe device instance
@@ -213,6 +221,8 @@ int xe_pm_suspend(struct xe_device *xe)
 	drm_dbg(&xe->drm, "Suspending device\n");
 	trace_xe_pm_suspend(xe, __builtin_return_address(0));
 
+	xe_pm_suspend_prepare(xe);
+
 	err = xe_pxp_pm_suspend(xe->pxp);
 	if (err)
 		goto err;
@@ -875,6 +885,8 @@ void xe_pm_d3cold_allowed_toggle(struct xe_device *xe)
 
 	if (total_vram_used_mb < xe->d3cold.vram_threshold)
 		xe->d3cold.allowed = XE_D3COLD_OFF;
+	else if (xe->d3cold.vrsr_capable && xe_display_connected(xe))
+		xe->d3cold.allowed = XE_D3COLD_VRSR;
 	else
 		xe->d3cold.allowed = XE_D3HOT;
 
-- 
2.34.1