DRM: Add the first atomic commit time for resume

drivers/acpi/sleep.c

@@ -32,6 +32,7 @@
  */
 bool acpi_no_s5;
 static u8 sleep_states[ACPI_S_STATE_COUNT];
+ktime_t acpi_resume_begin;
 
 static void acpi_sleep_tts_switch(u32 acpi_state)
 {
@@ -598,6 +599,7 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
 		if (error)
 			return error;
 		pr_info("Low-level resume complete\n");
+		acpi_resume_begin = ktime_get();
 		pm_set_resume_via_firmware();
 		break;
 	}

drivers/gpu/drm/drm_atomic_helper.c

@@ -27,6 +27,7 @@
 
 #include <linux/dma-fence.h>
 #include <linux/ktime.h>
+#include <linux/suspend.h>
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
@@ -2517,6 +2518,14 @@ void drm_atomic_helper_commit_hw_done(struct drm_atomic_state *old_state)
 		complete_all(&old_state->fake_commit->hw_done);
 		complete_all(&old_state->fake_commit->flip_done);
 	}
+
+	if (old_state->resume == true) {
+		old_state->resume = false;
+		ktime_t now = ktime_get();
+		u64 period_ns = ktime_to_ns(ktime_sub(now, acpi_resume_begin));
+		drm_info(crtc->dev, "The period from S3 resume to the first display atomic commit: %lld\n",
+			(long long)period_ns);
+	}
 }
 EXPORT_SYMBOL(drm_atomic_helper_commit_hw_done);
 
@@ -3572,6 +3581,7 @@ int drm_atomic_helper_resume(struct drm_device *dev,
 	int err;
 
 	drm_mode_config_reset(dev);
+	state->resume = true;
 
 	DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, err);
 

include/drm/drm_atomic.h

@@ -428,6 +428,14 @@ struct drm_atomic_state {
 	 * commit without blocking.
 	 */
 	struct work_struct commit_work;
+
+	/**
+	 * @resume:
+	 *
+	 * Indicate if system just resume from S3, will used it to control if print
+	 * the first commit period.
+	 */
+	bool resume : 1;
 };
 
 void __drm_crtc_commit_free(struct kref *kref);

include/linux/suspend.h

@@ -11,6 +11,7 @@
 #include <linux/android_kabi.h>
 #include <asm/errno.h>
 
+extern ktime_t acpi_resume_begin;
 #ifdef CONFIG_VT
 extern void pm_set_vt_switch(int);
 #else