[PATCH v4 07/11] drm/xe/vrsr: Enable VRSR on default VGA boot device

[Badal Nilawar <badal.nilawar@xxxxxxxxx>]

The VRSR feature is to enhance the display screen refresh experience
when the device exits from the D3Cold state. Therefore, apply the VRSR
feature to the default VGA boot device and when a display is connected.

Signed-off-by: Badal Nilawar <badal.nilawar@xxxxxxxxx>
Signed-off-by: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>
---
 drivers/gpu/drm/xe/display/xe_display.c | 22 ++++++++++++++++++++++
 drivers/gpu/drm/xe/display/xe_display.h |  2 ++
 drivers/gpu/drm/xe/xe_pm.c              |  5 +++++
 3 files changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/xe/display/xe_display.c b/drivers/gpu/drm/xe/display/xe_display.c
index 20c3bcd953b7..b3da88b12b35 100644
--- a/drivers/gpu/drm/xe/display/xe_display.c
+++ b/drivers/gpu/drm/xe/display/xe_display.c
@@ -88,6 +88,28 @@ static void display_destroy(struct drm_device *dev, void *dummy)
 	destroy_workqueue(xe->display.hotplug.dp_wq);
 }
 
+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;
+}
+
 /**
  * xe_display_create - create display struct
  * @xe: XE device instance
diff --git a/drivers/gpu/drm/xe/display/xe_display.h b/drivers/gpu/drm/xe/display/xe_display.h
index 46e14f8dee28..c79441bccb43 100644
--- a/drivers/gpu/drm/xe/display/xe_display.h
+++ b/drivers/gpu/drm/xe/display/xe_display.h
@@ -39,6 +39,7 @@ 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
 
@@ -71,5 +72,6 @@ static inline void xe_display_pm_runtime_suspend(struct xe_device *xe) {}
 static inline void xe_display_pm_runtime_suspend_late(struct xe_device *xe) {}
 static inline void xe_display_pm_runtime_resume(struct xe_device *xe) {}
 
+static inline bool xe_display_connected(struct xe_device *xe) { return false; }
 #endif /* CONFIG_DRM_XE_DISPLAY */
 #endif /* _XE_DISPLAY_H_ */
diff --git a/drivers/gpu/drm/xe/xe_pm.c b/drivers/gpu/drm/xe/xe_pm.c
index 278f2eeeaab6..c84b9b3f7371 100644
--- a/drivers/gpu/drm/xe/xe_pm.c
+++ b/drivers/gpu/drm/xe/xe_pm.c
@@ -9,6 +9,7 @@
 #include <linux/fault-inject.h>
 #include <linux/pm_runtime.h>
 #include <linux/suspend.h>
+#include <linux/vgaarb.h>
 
 #include <drm/drm_managed.h>
 #include <drm/ttm/ttm_placement.h>
@@ -310,6 +311,7 @@ static int pci_acpi_aux_power_setup(struct xe_device *xe)
 
 static void xe_pm_vrsr_init(struct xe_device *xe)
 {
+	struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
 	int ret;
 
 	/* Check if platform support D3Cold VRSR */
@@ -319,6 +321,9 @@ static void xe_pm_vrsr_init(struct xe_device *xe)
 	if (!xe_pm_vrsr_capable(xe))
 		return;
 
+	if (pdev != vga_default_device() || !xe_display_connected(xe))
+		return;
+
 	/*
 	 * If the VRSR initialization fails, the device will proceed with the regular
 	 * D3Cold flow
-- 
2.34.1