Merge "msm: drm: add hibernation support"

drivers/gpu/drm/msm/msm_drv.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2016-2019, The Linux Foundation. All rights reserved.
  * Copyright (C) 2013 Red Hat
  * Author: Rob Clark <robdclark@gmail.com>
  *
@@ -2134,10 +2134,150 @@ static int msm_pm_resume(struct device *dev)
 
 	return 0;
 }
+
+static int msm_pm_freeze(struct device *dev)
+{
+	struct drm_device *ddev;
+	struct drm_crtc *crtc;
+	struct drm_modeset_acquire_ctx *ctx;
+	struct drm_atomic_state *state;
+	struct msm_drm_private *priv;
+	struct msm_kms *kms;
+	int early_display = 0;
+	int ret = 0;
+
+	if (!dev)
+		return -EINVAL;
+
+	ddev = dev_get_drvdata(dev);
+	if (!ddev || !ddev->dev_private)
+		return -EINVAL;
+
+	priv = ddev->dev_private;
+
+	kms = priv->kms;
+	if (kms && kms->funcs && kms->funcs->early_display_status)
+		early_display = kms->funcs->early_display_status(kms);
+
+	SDE_EVT32(0);
+
+	if (early_display) {
+		/* acquire modeset lock(s) */
+		drm_modeset_lock_all(ddev);
+		ctx = ddev->mode_config.acquire_ctx;
+
+		/* save current state for restore */
+		if (priv->suspend_state)
+			drm_atomic_state_free(priv->suspend_state);
+
+		priv->suspend_state =
+			drm_atomic_helper_duplicate_state(ddev, ctx);
+
+		if (IS_ERR_OR_NULL(priv->suspend_state)) {
+			DRM_ERROR("failed to back up suspend state\n");
+			priv->suspend_state = NULL;
+			goto unlock;
+		}
+
+		/* create atomic null state to idle CRTCs */
+		state = drm_atomic_state_alloc(ddev);
+		if (IS_ERR_OR_NULL(state)) {
+			DRM_ERROR("failed to allocate null atomic state\n");
+			goto unlock;
+		}
+
+		state->acquire_ctx = ctx;
+
+		/* commit the null state */
+		ret = drm_atomic_commit(state);
+		if (ret < 0) {
+			DRM_ERROR("failed to commit null state, %d\n", ret);
+			drm_atomic_state_free(state);
+		}
+
+		drm_for_each_crtc(crtc, ddev)
+			drm_crtc_vblank_off(crtc);
+
+unlock:
+		drm_modeset_unlock_all(ddev);
+	} else {
+		ret = msm_pm_suspend(dev);
+		if (ret)
+			return ret;
+	}
+	return 0;
+}
+
+static int msm_pm_restore(struct device *dev)
+{
+	struct drm_device *ddev;
+	struct drm_crtc *crtc;
+	struct msm_drm_private *priv;
+	struct msm_kms *kms;
+	int early_display = 0;
+	int ret;
+
+	if (!dev)
+		return -EINVAL;
+
+	ddev = dev_get_drvdata(dev);
+	if (!ddev || !ddev->dev_private)
+		return -EINVAL;
+
+	priv = ddev->dev_private;
+
+	kms = priv->kms;
+	if (kms && kms->funcs && kms->funcs->early_display_status)
+		early_display = kms->funcs->early_display_status(kms);
+
+
+	SDE_EVT32(priv->suspend_state != NULL);
+
+	if (early_display) {
+		drm_mode_config_reset(ddev);
+
+		drm_modeset_lock_all(ddev);
+
+		drm_for_each_crtc(crtc, ddev)
+			drm_crtc_vblank_on(crtc);
+
+		if (priv->suspend_state) {
+			priv->suspend_state->acquire_ctx =
+				ddev->mode_config.acquire_ctx;
+
+			ret = drm_atomic_commit(priv->suspend_state);
+			if (ret < 0) {
+				DRM_ERROR("failed to restore state, %d\n", ret);
+				drm_atomic_state_free(priv->suspend_state);
+			}
+
+			priv->suspend_state = NULL;
+		}
+
+		drm_modeset_unlock_all(ddev);
+	} else {
+		ret = msm_pm_resume(dev);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int msm_pm_thaw(struct device *dev)
+{
+	msm_pm_restore(dev);
+
+	return 0;
+}
 #endif
 
 static const struct dev_pm_ops msm_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(msm_pm_suspend, msm_pm_resume)
+	.suspend = msm_pm_suspend,
+	.resume = msm_pm_resume,
+	.freeze = msm_pm_freeze,
+	.restore = msm_pm_restore,
+	.thaw = msm_pm_thaw,
 };
 
 static int msm_drm_bind(struct device *dev)

drivers/gpu/drm/msm/msm_kms.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2016-2017, 2019, The Linux Foundation. All rights reserved.
  * Copyright (C) 2013 Red Hat
  * Author: Rob Clark <robdclark@gmail.com>
  *
@@ -98,6 +98,7 @@ struct msm_kms_funcs {
 			struct drm_encoder *slave_encoder,
 			bool is_cmd_mode);
 	void (*postopen)(struct msm_kms *kms, struct drm_file *file);
+	bool (*early_display_status)(struct msm_kms *kms);
 	/* cleanup: */
 	void (*preclose)(struct msm_kms *kms, struct drm_file *file);
 	void (*postclose)(struct msm_kms *kms, struct drm_file *file);

drivers/gpu/drm/msm/sde/sde_connector.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2016-2019, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -11,6 +11,8 @@
  */
 
 #define pr_fmt(fmt)	"[drm:%s:%d] " fmt, __func__, __LINE__
+#include <linux/suspend.h>
+
 #include "msm_drv.h"
 
 #include "sde_kms.h"
@@ -586,11 +588,16 @@ void sde_connector_complete_commit(struct drm_connector *connector)
 	/* signal connector's retire fence */
 	sde_fence_signal(&to_sde_connector(connector)->retire_fence, 0);
 
-	/*
-	 * After LK totally exits, LK's early splash resource
-	 * should be released.
+	/* If below both 2 conditions are met, LK's early splash resources
+	 * should be freed.
+	 *	1) When get_hibernation_status() is returned as true.
+	 *		a. hibernation image snapshot failed.
+	 *		b. hibernation restore successful.
+	 *		c. hibernation restore failed.
+	 *	2) After LK totally exits.
 	 */
-	if (sde_splash_get_lk_complete_status(priv->kms)) {
+	if (get_hibernation_status() &&
+		sde_splash_get_lk_complete_status(priv->kms)) {
 		c_conn = to_sde_connector(connector);
 
 		sde_splash_free_resource(priv->kms, &priv->phandle,

drivers/gpu/drm/msm/sde/sde_kms.c

@@ -1171,6 +1171,13 @@ static void sde_kms_preclose(struct msm_kms *kms, struct drm_file *file)
 		sde_crtc_cancel_pending_flip(priv->crtcs[i], file);
 }
 
+static bool sde_kms_early_display_status(struct msm_kms *kms)
+{
+	struct sde_kms *sde_kms = to_sde_kms(kms);
+
+	return sde_kms->splash_info.handoff;
+}
+
 static const struct msm_kms_funcs kms_funcs = {
 	.hw_init         = sde_kms_hw_init,
 	.postinit        = sde_kms_postinit,
@@ -1190,6 +1197,7 @@ static const struct msm_kms_funcs kms_funcs = {
 	.get_format      = sde_get_msm_format,
 	.round_pixclk    = sde_kms_round_pixclk,
 	.destroy         = sde_kms_destroy,
+	.early_display_status = sde_kms_early_display_status,
 };
 
 /* the caller api needs to turn on clock before calling it */

drivers/gpu/drm/msm/sde/sde_splash.c

@@ -15,6 +15,8 @@
 #include <linux/debugfs.h>
 #include <linux/memblock.h>
 #include <soc/qcom/early_domain.h>
+#include <linux/suspend.h>
+
 #include "msm_drv.h"
 #include "msm_mmu.h"
 #include "sde_kms.h"
@@ -759,7 +761,6 @@ bool sde_splash_get_lk_complete_status(struct msm_kms *kms)
 	intr = sde_kms->hw_intr;
 
 	if (sde_kms->splash_info.handoff &&
-		!sde_kms->splash_info.display_splash_enabled &&
 		!_sde_splash_lk_check()) {
 		SDE_DEBUG("LK totally exits\n");
 		return true;
@@ -948,13 +949,21 @@ int sde_splash_lk_stop_splash(struct msm_kms *kms,
 	mutex_lock(&sde_splash_lock);
 	if (_sde_splash_validate_commit(sde_kms, state) &&
 			sinfo->display_splash_enabled) {
-		if (_sde_splash_lk_check())
+		if (_sde_splash_lk_check()) {
 			_sde_splash_notify_lk_stop_splash();
-
-		sinfo->display_splash_enabled = false;
-
 			error = _sde_splash_clear_mixer_blendstage(kms, state);
 		}
+
+		if (get_hibernation_status() == true) {
+			sinfo->display_splash_enabled = false;
+		} else {
+			/* preserve the display_splash_enabled state for
+			 * case when system is restoring from hibernation
+			 * image and splash is enabled.
+			 */
+			sinfo->display_splash_enabled = true;
+		}
+	}
 	mutex_unlock(&sde_splash_lock);
 
 	return error;

include/linux/suspend.h

@@ -380,6 +380,7 @@ extern unsigned long get_safe_page(gfp_t gfp_mask);
 extern asmlinkage int swsusp_arch_suspend(void);
 extern asmlinkage int swsusp_arch_resume(void);
 
+static inline bool get_hibernation_status(void) { return true; };
 extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
 extern int hibernate(void);
 extern bool system_entering_hibernation(void);
@@ -393,6 +394,7 @@ static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
 static inline void swsusp_set_page_free(struct page *p) {}
 static inline void swsusp_unset_page_free(struct page *p) {}
 
+static inline bool get_hibernation_status(void) { return true; };
 static inline void hibernation_set_ops(const struct platform_hibernation_ops *ops) {}
 static inline int hibernate(void) { return -ENOSYS; }
 static inline bool system_entering_hibernation(void) { return false; }