[PATCH v3 0/4] drm/msm: Use atomic helpers for PM suspend/resume

[PATCH v3 0/4] drm/msm: Use atomic helpers for PM suspend/resume

[Bruce Wang]

Patches 1-2: Changes msm_pm_resume implementation to use atomic helpers
and
removes the previously used dpu_kms_pm_suspend/resume functions.
Patches 3-4: Removes reliance on knowledge about suspend state from crtc
and removes dpu_crtc_reset in favour of the atomic helper.

v2: Reorganized patch ordering, added removal of suspend state reliance
v3: Condesed suspend state reliance patches into one patch (patch 3),
added removal of dpu_crtc_reset

Bruce Wang (4):
  drm/msm/dpu: Remove dpu_kms_pm_suspend/resume
  drm/msm: Cut dpu_kms hooks from msm_pm_suspend/resume
  drm/msm/dpu: Remove suspend state tracking from crtc
  drm/msm/dpu: Replace dpu_crtc_reset by atomic helper

 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c  |  87 +--------------
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h  |   2 -
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c   | 123 ----------------------
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h   |  31 ------
 drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h |  15 +--
 drivers/gpu/drm/msm/msm_drv.c             |  27 +++--
 drivers/gpu/drm/msm/msm_kms.h             |   3 -
 7 files changed, 19 insertions(+), 269 deletions(-)

-- 
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[PATCH v3 1/4] drm/msm/dpu: Remove dpu_kms_pm_suspend/resume

[Bruce Wang]

PM resume was crashing during dpu_kms_pm_resume. This patch removes
dpu_kms_pm_suspend/resume so that msm_pm_suspend/resume uses the atomic
helpers instead (see next patch). This patch also removes
dpu_kms_is_suspend_blocked since it is never called.

v2: Reorganized patches in patchset

Signed-off-by: Bruce Wang <bzwang@chromium.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 123 ------------------------
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h |  15 ---
 2 files changed, 138 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 0a683e65a9f3..ff06b50dfc87 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -709,127 +709,6 @@ static void dpu_kms_destroy(struct msm_kms *kms)
 	_dpu_kms_hw_destroy(dpu_kms);
 }
 
-static int dpu_kms_pm_suspend(struct device *dev)
-{
-	struct drm_device *ddev;
-	struct drm_modeset_acquire_ctx ctx;
-	struct drm_atomic_state *state;
-	struct dpu_kms *dpu_kms;
-	int ret = 0, num_crtcs = 0;
-
-	if (!dev)
-		return -EINVAL;
-
-	ddev = dev_get_drvdata(dev);
-	if (!ddev || !ddev_to_msm_kms(ddev))
-		return -EINVAL;
-
-	dpu_kms = to_dpu_kms(ddev_to_msm_kms(ddev));
-
-	/* disable hot-plug polling */
-	drm_kms_helper_poll_disable(ddev);
-
-	/* acquire modeset lock(s) */
-	drm_modeset_acquire_init(&ctx, 0);
-
-retry:
-	DPU_ATRACE_BEGIN("kms_pm_suspend");
-
-	ret = drm_modeset_lock_all_ctx(ddev, &ctx);
-	if (ret)
-		goto unlock;
-
-	/* save current state for resume */
-	if (dpu_kms->suspend_state)
-		drm_atomic_state_put(dpu_kms->suspend_state);
-	dpu_kms->suspend_state = drm_atomic_helper_duplicate_state(ddev, &ctx);
-	if (IS_ERR_OR_NULL(dpu_kms->suspend_state)) {
-		DRM_ERROR("failed to back up suspend state\n");
-		dpu_kms->suspend_state = NULL;
-		goto unlock;
-	}
-
-	/* create atomic state to disable all CRTCs */
-	state = drm_atomic_state_alloc(ddev);
-	if (IS_ERR_OR_NULL(state)) {
-		DRM_ERROR("failed to allocate crtc disable state\n");
-		goto unlock;
-	}
-
-	state->acquire_ctx = &ctx;
-
-	/* check for nothing to do */
-	if (num_crtcs == 0) {
-		DRM_DEBUG("all crtcs are already in the off state\n");
-		drm_atomic_state_put(state);
-		goto suspended;
-	}
-
-	/* commit the "disable all" state */
-	ret = drm_atomic_commit(state);
-	if (ret < 0) {
-		DRM_ERROR("failed to disable crtcs, %d\n", ret);
-		drm_atomic_state_put(state);
-		goto unlock;
-	}
-
-suspended:
-	dpu_kms->suspend_block = true;
-
-unlock:
-	if (ret == -EDEADLK) {
-		drm_modeset_backoff(&ctx);
-		goto retry;
-	}
-	drm_modeset_drop_locks(&ctx);
-	drm_modeset_acquire_fini(&ctx);
-
-	DPU_ATRACE_END("kms_pm_suspend");
-	return 0;
-}
-
-static int dpu_kms_pm_resume(struct device *dev)
-{
-	struct drm_device *ddev;
-	struct dpu_kms *dpu_kms;
-	int ret;
-
-	if (!dev)
-		return -EINVAL;
-
-	ddev = dev_get_drvdata(dev);
-	if (!ddev || !ddev_to_msm_kms(ddev))
-		return -EINVAL;
-
-	dpu_kms = to_dpu_kms(ddev_to_msm_kms(ddev));
-
-	DPU_ATRACE_BEGIN("kms_pm_resume");
-
-	drm_mode_config_reset(ddev);
-
-	drm_modeset_lock_all(ddev);
-
-	dpu_kms->suspend_block = false;
-
-	if (dpu_kms->suspend_state) {
-		dpu_kms->suspend_state->acquire_ctx =
-			ddev->mode_config.acquire_ctx;
-		ret = drm_atomic_commit(dpu_kms->suspend_state);
-		if (ret < 0) {
-			DRM_ERROR("failed to restore state, %d\n", ret);
-			drm_atomic_state_put(dpu_kms->suspend_state);
-		}
-		dpu_kms->suspend_state = NULL;
-	}
-	drm_modeset_unlock_all(ddev);
-
-	/* enable hot-plug polling */
-	drm_kms_helper_poll_enable(ddev);
-
-	DPU_ATRACE_END("kms_pm_resume");
-	return 0;
-}
-
 static void _dpu_kms_set_encoder_mode(struct msm_kms *kms,
 				 struct drm_encoder *encoder,
 				 bool cmd_mode)
@@ -873,8 +752,6 @@ static const struct msm_kms_funcs kms_funcs = {
 	.check_modified_format = dpu_format_check_modified_format,
 	.get_format      = dpu_get_msm_format,
 	.round_pixclk    = dpu_kms_round_pixclk,
-	.pm_suspend      = dpu_kms_pm_suspend,
-	.pm_resume       = dpu_kms_pm_resume,
 	.destroy         = dpu_kms_destroy,
 	.set_encoder_mode = _dpu_kms_set_encoder_mode,
 #ifdef CONFIG_DEBUG_FS
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
index 66d466628e2b..1991cbe424a3 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
@@ -137,7 +137,6 @@ struct dpu_kms {
 
 	/* saved atomic state during system suspend */
 	struct drm_atomic_state *suspend_state;
-	bool suspend_block;
 
 	struct dpu_rm rm;
 	bool rm_init;
@@ -176,20 +175,6 @@ static inline bool dpu_kms_is_suspend_state(struct drm_device *dev)
 	return to_dpu_kms(ddev_to_msm_kms(dev))->suspend_state != NULL;
 }
 
-/**
- * dpu_kms_is_suspend_blocked - whether or not commits are blocked due to pm
- *				suspend status
- * @dev: Pointer to drm device
- * Return: True if commits should be rejected due to pm suspend
- */
-static inline bool dpu_kms_is_suspend_blocked(struct drm_device *dev)
-{
-	if (!dpu_kms_is_suspend_state(dev))
-		return false;
-
-	return to_dpu_kms(ddev_to_msm_kms(dev))->suspend_block;
-}
-
 /**
  * Debugfs functions - extra helper functions for debugfs support
  *
-- 
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[PATCH v3 2/4] drm/msm: Cut dpu_kms hooks from msm_pm_suspend/resume

[Bruce Wang]

Removes the traces of the non-atomic helper calls in
msm_pm_suspend/resume since we just deleted those functions (see patch
1). Also removes the drm_kms_helper_poll_disable/enable calls, since
the DRM_CONNECTOR_POLL_CONNECT flag is never set so periodic polling
doesn't happen anyways.

v2: reorganized patch order
v3: made error checks less severe

Signed-off-by: Bruce Wang <bzwang@chromium.org>
---
 drivers/gpu/drm/msm/msm_drv.c | 27 ++++++++++++---------------
 drivers/gpu/drm/msm/msm_kms.h |  3 ---
 2 files changed, 12 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 4904d0d41409..f5cd7f6ce4f8 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -1069,18 +1069,15 @@ static int msm_pm_suspend(struct device *dev)
 {
 	struct drm_device *ddev = dev_get_drvdata(dev);
 	struct msm_drm_private *priv = ddev->dev_private;
-	struct msm_kms *kms = priv->kms;
-
-	/* TODO: Use atomic helper suspend/resume */
-	if (kms && kms->funcs && kms->funcs->pm_suspend)
-		return kms->funcs->pm_suspend(dev);
 
-	drm_kms_helper_poll_disable(ddev);
+	if (WARN_ON(priv->pm_state))
+		drm_atomic_state_put(priv->pm_state);
 
 	priv->pm_state = drm_atomic_helper_suspend(ddev);
 	if (IS_ERR(priv->pm_state)) {
-		drm_kms_helper_poll_enable(ddev);
-		return PTR_ERR(priv->pm_state);
+		int ret = PTR_ERR(priv->pm_state);
+		DRM_ERROR("Failed to suspend dpu, %d\n", ret);
+		return ret;
 	}
 
 	return 0;
@@ -1090,16 +1087,16 @@ static int msm_pm_resume(struct device *dev)
 {
 	struct drm_device *ddev = dev_get_drvdata(dev);
 	struct msm_drm_private *priv = ddev->dev_private;
-	struct msm_kms *kms = priv->kms;
+	int ret;
 
-	/* TODO: Use atomic helper suspend/resume */
-	if (kms && kms->funcs && kms->funcs->pm_resume)
-		return kms->funcs->pm_resume(dev);
+	if (WARN_ON(!priv->pm_state))
+		return -ENOENT;
 
-	drm_atomic_helper_resume(ddev, priv->pm_state);
-	drm_kms_helper_poll_enable(ddev);
+	ret = drm_atomic_helper_resume(ddev, priv->pm_state);
+	if (!ret)
+		priv->pm_state = NULL;
 
-	return 0;
+	return ret;
 }
 #endif
 
diff --git a/drivers/gpu/drm/msm/msm_kms.h b/drivers/gpu/drm/msm/msm_kms.h
index fd88cebb6adb..2b81b43a4bab 100644
--- a/drivers/gpu/drm/msm/msm_kms.h
+++ b/drivers/gpu/drm/msm/msm_kms.h
@@ -67,9 +67,6 @@ struct msm_kms_funcs {
 	void (*set_encoder_mode)(struct msm_kms *kms,
 				 struct drm_encoder *encoder,
 				 bool cmd_mode);
-	/* pm suspend/resume hooks */
-	int (*pm_suspend)(struct device *dev);
-	int (*pm_resume)(struct device *dev);
 	/* cleanup: */
 	void (*destroy)(struct msm_kms *kms);
 #ifdef CONFIG_DEBUG_FS
-- 
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[PATCH v3 3/4] drm/msm/dpu: Remove suspend state tracking from crtc

[Bruce Wang]

Since drm core's modeset locks serialize atomic commits, we don't need to
track whether or not we're in a suspended state from inside the crtc for
dpu_crtc_enable/disable. This patch removes the suspend logic from the crtc and
removes the relevant tracing from dpu_trace. Since we removed all calls
to dpu_kms_is_suspend_state, we can remove that function and the
suspend_state field of dpu_kms as well.

v2: added patch to patchset
v3: reworded commit body and moved deletion of dpu_kms_is_suspend_state and
suspend_state to this patch

Signed-off-by: Bruce Wang <bzwang@chromium.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c  | 48 ++---------------------
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h  |  2 -
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h   | 16 --------
 drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h | 15 +------
 4 files changed, 6 insertions(+), 75 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index d4530d60767b..ac604055a824 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -815,35 +815,6 @@ static void _dpu_crtc_vblank_enable_no_lock(
 	}
 }
 
-/**
- * _dpu_crtc_set_suspend - notify crtc of suspend enable/disable
- * @crtc: Pointer to drm crtc object
- * @enable: true to enable suspend, false to indicate resume
- */
-static void _dpu_crtc_set_suspend(struct drm_crtc *crtc, bool enable)
-{
-	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
-
-	DRM_DEBUG_KMS("crtc%d suspend = %d\n", crtc->base.id, enable);
-
-	mutex_lock(&dpu_crtc->crtc_lock);
-
-	/*
-	 * If the vblank is enabled, release a power reference on suspend
-	 * and take it back during resume (if it is still enabled).
-	 */
-	trace_dpu_crtc_set_suspend(DRMID(&dpu_crtc->base), enable, dpu_crtc);
-	if (dpu_crtc->suspend == enable)
-		DPU_DEBUG("crtc%d suspend already set to %d, ignoring update\n",
-				crtc->base.id, enable);
-	else if (dpu_crtc->enabled && dpu_crtc->vblank_requested) {
-		_dpu_crtc_vblank_enable_no_lock(dpu_crtc, !enable);
-	}
-
-	dpu_crtc->suspend = enable;
-	mutex_unlock(&dpu_crtc->crtc_lock);
-}
-
 /**
  * dpu_crtc_duplicate_state - state duplicate hook
  * @crtc: Pointer to drm crtc structure
@@ -951,9 +922,6 @@ static void dpu_crtc_disable(struct drm_crtc *crtc)
 
 	DRM_DEBUG_KMS("crtc%d\n", crtc->base.id);
 
-	if (dpu_kms_is_suspend_state(crtc->dev))
-		_dpu_crtc_set_suspend(crtc, true);
-
 	/* Disable/save vblank irq handling */
 	drm_crtc_vblank_off(crtc);
 
@@ -966,8 +934,7 @@ static void dpu_crtc_disable(struct drm_crtc *crtc)
 				atomic_read(&dpu_crtc->frame_pending));
 
 	trace_dpu_crtc_disable(DRMID(crtc), false, dpu_crtc);
-	if (dpu_crtc->enabled && !dpu_crtc->suspend &&
-			dpu_crtc->vblank_requested) {
+	if (dpu_crtc->enabled && dpu_crtc->vblank_requested) {
 		_dpu_crtc_vblank_enable_no_lock(dpu_crtc, false);
 	}
 	dpu_crtc->enabled = false;
@@ -1033,8 +1000,7 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
 
 	mutex_lock(&dpu_crtc->crtc_lock);
 	trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
-	if (!dpu_crtc->enabled && !dpu_crtc->suspend &&
-			dpu_crtc->vblank_requested) {
+	if (!dpu_crtc->enabled && dpu_crtc->vblank_requested) {
 		_dpu_crtc_vblank_enable_no_lock(dpu_crtc, true);
 	}
 	dpu_crtc->enabled = true;
@@ -1289,17 +1255,11 @@ static int dpu_crtc_atomic_check(struct drm_crtc *crtc,
 
 int dpu_crtc_vblank(struct drm_crtc *crtc, bool en)
 {
-	struct dpu_crtc *dpu_crtc;
-
-	if (!crtc) {
-		DPU_ERROR("invalid crtc\n");
-		return -EINVAL;
-	}
-	dpu_crtc = to_dpu_crtc(crtc);
+	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
 
 	mutex_lock(&dpu_crtc->crtc_lock);
 	trace_dpu_crtc_vblank(DRMID(&dpu_crtc->base), en, dpu_crtc);
-	if (dpu_crtc->enabled && !dpu_crtc->suspend) {
+	if (dpu_crtc->enabled) {
 		_dpu_crtc_vblank_enable_no_lock(dpu_crtc, en);
 	}
 	dpu_crtc->vblank_requested = en;
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
index 3723b4830335..7dc181aabb4d 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
@@ -133,7 +133,6 @@ struct dpu_crtc_frame_event {
  * @play_count    : frame count between crtc enable and disable
  * @vblank_cb_time  : ktime at vblank count reset
  * @vblank_requested : whether the user has requested vblank events
- * @suspend         : whether or not a suspend operation is in progress
  * @enabled       : whether the DPU CRTC is currently enabled. updated in the
  *                  commit-thread, not state-swap time which is earlier, so
  *                  safe to make decisions on during VBLANK on/off work
@@ -169,7 +168,6 @@ struct dpu_crtc {
 	u64 play_count;
 	ktime_t vblank_cb_time;
 	bool vblank_requested;
-	bool suspend;
 	bool enabled;
 
 	struct list_head feature_list;
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
index 1991cbe424a3..2a3625eef6d3 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
@@ -135,9 +135,6 @@ struct dpu_kms {
 
 	struct dpu_core_perf perf;
 
-	/* saved atomic state during system suspend */
-	struct drm_atomic_state *suspend_state;
-
 	struct dpu_rm rm;
 	bool rm_init;
 
@@ -162,19 +159,6 @@ struct vsync_info {
 #define ddev_to_msm_kms(D) ((D) && (D)->dev_private ? \
 		((struct msm_drm_private *)((D)->dev_private))->kms : NULL)
 
-/**
- * dpu_kms_is_suspend_state - whether or not the system is pm suspended
- * @dev: Pointer to drm device
- * Return: Suspend status
- */
-static inline bool dpu_kms_is_suspend_state(struct drm_device *dev)
-{
-	if (!ddev_to_msm_kms(dev))
-		return false;
-
-	return to_dpu_kms(ddev_to_msm_kms(dev))->suspend_state != NULL;
-}
-
 /**
  * Debugfs functions - extra helper functions for debugfs support
  *
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h
index 636b31b0d311..0c122e173892 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h
@@ -749,7 +749,6 @@ TRACE_EVENT(dpu_crtc_vblank_enable,
 		__field(	uint32_t,		enc_id	)
 		__field(	bool,			enable	)
 		__field(	bool,			enabled )
-		__field(	bool,			suspend )
 		__field(	bool,			vblank_requested )
 	),
 	TP_fast_assign(
@@ -757,15 +756,12 @@ TRACE_EVENT(dpu_crtc_vblank_enable,
 		__entry->enc_id = enc_id;
 		__entry->enable = enable;
 		__entry->enabled = crtc->enabled;
-		__entry->suspend = crtc->suspend;
 		__entry->vblank_requested = crtc->vblank_requested;
 	),
-	TP_printk("id:%u encoder:%u enable:%s state{enabled:%s suspend:%s "
-		  "vblank_req:%s}",
+	TP_printk("id:%u encoder:%u enable:%s state{enabled:%s vblank_req:%s}",
 		  __entry->drm_id, __entry->enc_id,
 		  __entry->enable ? "true" : "false",
 		  __entry->enabled ? "true" : "false",
-		  __entry->suspend ? "true" : "false",
 		  __entry->vblank_requested ? "true" : "false")
 );
 
@@ -776,26 +772,19 @@ DECLARE_EVENT_CLASS(dpu_crtc_enable_template,
 		__field(	uint32_t,		drm_id	)
 		__field(	bool,			enable	)
 		__field(	bool,			enabled )
-		__field(	bool,			suspend )
 		__field(	bool,			vblank_requested )
 	),
 	TP_fast_assign(
 		__entry->drm_id = drm_id;
 		__entry->enable = enable;
 		__entry->enabled = crtc->enabled;
-		__entry->suspend = crtc->suspend;
 		__entry->vblank_requested = crtc->vblank_requested;
 	),
-	TP_printk("id:%u enable:%s state{enabled:%s suspend:%s vblank_req:%s}",
+	TP_printk("id:%u enable:%s state{enabled:%s vblank_req:%s}",
 		  __entry->drm_id, __entry->enable ? "true" : "false",
 		  __entry->enabled ? "true" : "false",
-		  __entry->suspend ? "true" : "false",
 		  __entry->vblank_requested ? "true" : "false")
 );
-DEFINE_EVENT(dpu_crtc_enable_template, dpu_crtc_set_suspend,
-	TP_PROTO(uint32_t drm_id, bool enable, struct dpu_crtc *crtc),
-	TP_ARGS(drm_id, enable, crtc)
-);
 DEFINE_EVENT(dpu_crtc_enable_template, dpu_crtc_enable,
 	TP_PROTO(uint32_t drm_id, bool enable, struct dpu_crtc *crtc),
 	TP_ARGS(drm_id, enable, crtc)
-- 
2.19.0.605.g01d371f741-goog

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[PATCH v3 4/4] drm/msm/dpu: Replace dpu_crtc_reset by atomic helper

[Bruce Wang]

Since we removed all suspend logic from the crtc code (see patch 3/4),
dpu_crtc_reset does the same things as drm_atomic_helper_crtc_reset, so let's
just replace it with a call to the atomic helper.

v3: added patch to patchset

Signed-off-by: Bruce Wang <bzwang@chromium.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 39 +-----------------------
 1 file changed, 1 insertion(+), 38 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index ac604055a824..c5ba753d441c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -844,43 +844,6 @@ static struct drm_crtc_state *dpu_crtc_duplicate_state(struct drm_crtc *crtc)
 	return &cstate->base;
 }
 
-/**
- * dpu_crtc_reset - reset hook for CRTCs
- * Resets the atomic state for @crtc by freeing the state pointer (which might
- * be NULL, e.g. at driver load time) and allocating a new empty state object.
- * @crtc: Pointer to drm crtc structure
- */
-static void dpu_crtc_reset(struct drm_crtc *crtc)
-{
-	struct dpu_crtc *dpu_crtc;
-	struct dpu_crtc_state *cstate;
-
-	if (!crtc) {
-		DPU_ERROR("invalid crtc\n");
-		return;
-	}
-
-	/* revert suspend actions, if necessary */
-	if (dpu_kms_is_suspend_state(crtc->dev))
-		_dpu_crtc_set_suspend(crtc, false);
-
-	/* remove previous state, if present */
-	if (crtc->state) {
-		dpu_crtc_destroy_state(crtc, crtc->state);
-		crtc->state = 0;
-	}
-
-	dpu_crtc = to_dpu_crtc(crtc);
-	cstate = kzalloc(sizeof(*cstate), GFP_KERNEL);
-	if (!cstate) {
-		DPU_ERROR("failed to allocate state\n");
-		return;
-	}
-
-	cstate->base.crtc = crtc;
-	crtc->state = &cstate->base;
-}
-
 static void dpu_crtc_handle_power_event(u32 event_type, void *arg)
 {
 	struct drm_crtc *crtc = arg;
@@ -1499,7 +1462,7 @@ static const struct drm_crtc_funcs dpu_crtc_funcs = {
 	.set_config = drm_atomic_helper_set_config,
 	.destroy = dpu_crtc_destroy,
 	.page_flip = drm_atomic_helper_page_flip,
-	.reset = dpu_crtc_reset,
+	.reset = drm_atomic_helper_crtc_reset,
 	.atomic_duplicate_state = dpu_crtc_duplicate_state,
 	.atomic_destroy_state = dpu_crtc_destroy_state,
 	.late_register = dpu_crtc_late_register,
-- 
2.19.0.605.g01d371f741-goog

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Re: [PATCH v3 2/4] drm/msm: Cut dpu_kms hooks from msm_pm_suspend/resume

[Sean Paul]

On Fri, Oct 05, 2018 at 05:04:01PM -0400, Bruce Wang wrote:
> Removes the traces of the non-atomic helper calls in
> msm_pm_suspend/resume since we just deleted those functions (see patch
> 1). Also removes the drm_kms_helper_poll_disable/enable calls, since
> the DRM_CONNECTOR_POLL_CONNECT flag is never set so periodic polling
> doesn't happen anyways.
> 
> v2: reorganized patch order
> v3: made error checks less severe
> 
> Signed-off-by: Bruce Wang <bzwang@chromium.org>

Reviewed-by: Sean Paul <seanpaul@chromium.org>

> ---
>  drivers/gpu/drm/msm/msm_drv.c | 27 ++++++++++++---------------
>  drivers/gpu/drm/msm/msm_kms.h |  3 ---
>  2 files changed, 12 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 4904d0d41409..f5cd7f6ce4f8 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -1069,18 +1069,15 @@ static int msm_pm_suspend(struct device *dev)
>  {
>  	struct drm_device *ddev = dev_get_drvdata(dev);
>  	struct msm_drm_private *priv = ddev->dev_private;
> -	struct msm_kms *kms = priv->kms;
> -
> -	/* TODO: Use atomic helper suspend/resume */
> -	if (kms && kms->funcs && kms->funcs->pm_suspend)
> -		return kms->funcs->pm_suspend(dev);
>  
> -	drm_kms_helper_poll_disable(ddev);
> +	if (WARN_ON(priv->pm_state))
> +		drm_atomic_state_put(priv->pm_state);
>  
>  	priv->pm_state = drm_atomic_helper_suspend(ddev);
>  	if (IS_ERR(priv->pm_state)) {
> -		drm_kms_helper_poll_enable(ddev);
> -		return PTR_ERR(priv->pm_state);
> +		int ret = PTR_ERR(priv->pm_state);
> +		DRM_ERROR("Failed to suspend dpu, %d\n", ret);
> +		return ret;
>  	}
>  
>  	return 0;
> @@ -1090,16 +1087,16 @@ static int msm_pm_resume(struct device *dev)
>  {
>  	struct drm_device *ddev = dev_get_drvdata(dev);
>  	struct msm_drm_private *priv = ddev->dev_private;
> -	struct msm_kms *kms = priv->kms;
> +	int ret;
>  
> -	/* TODO: Use atomic helper suspend/resume */
> -	if (kms && kms->funcs && kms->funcs->pm_resume)
> -		return kms->funcs->pm_resume(dev);
> +	if (WARN_ON(!priv->pm_state))
> +		return -ENOENT;
>  
> -	drm_atomic_helper_resume(ddev, priv->pm_state);
> -	drm_kms_helper_poll_enable(ddev);
> +	ret = drm_atomic_helper_resume(ddev, priv->pm_state);
> +	if (!ret)
> +		priv->pm_state = NULL;
>  
> -	return 0;
> +	return ret;
>  }
>  #endif
>  
> diff --git a/drivers/gpu/drm/msm/msm_kms.h b/drivers/gpu/drm/msm/msm_kms.h
> index fd88cebb6adb..2b81b43a4bab 100644
> --- a/drivers/gpu/drm/msm/msm_kms.h
> +++ b/drivers/gpu/drm/msm/msm_kms.h
> @@ -67,9 +67,6 @@ struct msm_kms_funcs {
>  	void (*set_encoder_mode)(struct msm_kms *kms,
>  				 struct drm_encoder *encoder,
>  				 bool cmd_mode);
> -	/* pm suspend/resume hooks */
> -	int (*pm_suspend)(struct device *dev);
> -	int (*pm_resume)(struct device *dev);
>  	/* cleanup: */
>  	void (*destroy)(struct msm_kms *kms);
>  #ifdef CONFIG_DEBUG_FS
> -- 
> 2.19.0.605.g01d371f741-goog
> 

-- 
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Re: [PATCH v3 3/4] drm/msm/dpu: Remove suspend state tracking from crtc

[Sean Paul]

On Fri, Oct 05, 2018 at 05:04:02PM -0400, Bruce Wang wrote:
> Since drm core's modeset locks serialize atomic commits, we don't need to
> track whether or not we're in a suspended state from inside the crtc for
> dpu_crtc_enable/disable. This patch removes the suspend logic from the crtc and
> removes the relevant tracing from dpu_trace. Since we removed all calls
> to dpu_kms_is_suspend_state, we can remove that function and the
> suspend_state field of dpu_kms as well.
> 
> v2: added patch to patchset
> v3: reworded commit body and moved deletion of dpu_kms_is_suspend_state and
> suspend_state to this patch
> 
> Signed-off-by: Bruce Wang <bzwang@chromium.org>

Reviewed-by: Sean Paul <seanpaul@chromium.org>

> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c  | 48 ++---------------------
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h  |  2 -
>  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h   | 16 --------
>  drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h | 15 +------
>  4 files changed, 6 insertions(+), 75 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index d4530d60767b..ac604055a824 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -815,35 +815,6 @@ static void _dpu_crtc_vblank_enable_no_lock(
>  	}
>  }
>  
> -/**
> - * _dpu_crtc_set_suspend - notify crtc of suspend enable/disable
> - * @crtc: Pointer to drm crtc object
> - * @enable: true to enable suspend, false to indicate resume
> - */
> -static void _dpu_crtc_set_suspend(struct drm_crtc *crtc, bool enable)
> -{
> -	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
> -
> -	DRM_DEBUG_KMS("crtc%d suspend = %d\n", crtc->base.id, enable);
> -
> -	mutex_lock(&dpu_crtc->crtc_lock);
> -
> -	/*
> -	 * If the vblank is enabled, release a power reference on suspend
> -	 * and take it back during resume (if it is still enabled).
> -	 */
> -	trace_dpu_crtc_set_suspend(DRMID(&dpu_crtc->base), enable, dpu_crtc);
> -	if (dpu_crtc->suspend == enable)
> -		DPU_DEBUG("crtc%d suspend already set to %d, ignoring update\n",
> -				crtc->base.id, enable);
> -	else if (dpu_crtc->enabled && dpu_crtc->vblank_requested) {
> -		_dpu_crtc_vblank_enable_no_lock(dpu_crtc, !enable);
> -	}
> -
> -	dpu_crtc->suspend = enable;
> -	mutex_unlock(&dpu_crtc->crtc_lock);
> -}
> -
>  /**
>   * dpu_crtc_duplicate_state - state duplicate hook
>   * @crtc: Pointer to drm crtc structure
> @@ -951,9 +922,6 @@ static void dpu_crtc_disable(struct drm_crtc *crtc)
>  
>  	DRM_DEBUG_KMS("crtc%d\n", crtc->base.id);
>  
> -	if (dpu_kms_is_suspend_state(crtc->dev))
> -		_dpu_crtc_set_suspend(crtc, true);
> -
>  	/* Disable/save vblank irq handling */
>  	drm_crtc_vblank_off(crtc);
>  
> @@ -966,8 +934,7 @@ static void dpu_crtc_disable(struct drm_crtc *crtc)
>  				atomic_read(&dpu_crtc->frame_pending));
>  
>  	trace_dpu_crtc_disable(DRMID(crtc), false, dpu_crtc);
> -	if (dpu_crtc->enabled && !dpu_crtc->suspend &&
> -			dpu_crtc->vblank_requested) {
> +	if (dpu_crtc->enabled && dpu_crtc->vblank_requested) {
>  		_dpu_crtc_vblank_enable_no_lock(dpu_crtc, false);
>  	}
>  	dpu_crtc->enabled = false;
> @@ -1033,8 +1000,7 @@ static void dpu_crtc_enable(struct drm_crtc *crtc,
>  
>  	mutex_lock(&dpu_crtc->crtc_lock);
>  	trace_dpu_crtc_enable(DRMID(crtc), true, dpu_crtc);
> -	if (!dpu_crtc->enabled && !dpu_crtc->suspend &&
> -			dpu_crtc->vblank_requested) {
> +	if (!dpu_crtc->enabled && dpu_crtc->vblank_requested) {
>  		_dpu_crtc_vblank_enable_no_lock(dpu_crtc, true);
>  	}
>  	dpu_crtc->enabled = true;
> @@ -1289,17 +1255,11 @@ static int dpu_crtc_atomic_check(struct drm_crtc *crtc,
>  
>  int dpu_crtc_vblank(struct drm_crtc *crtc, bool en)
>  {
> -	struct dpu_crtc *dpu_crtc;
> -
> -	if (!crtc) {
> -		DPU_ERROR("invalid crtc\n");
> -		return -EINVAL;
> -	}
> -	dpu_crtc = to_dpu_crtc(crtc);
> +	struct dpu_crtc *dpu_crtc = to_dpu_crtc(crtc);
>  
>  	mutex_lock(&dpu_crtc->crtc_lock);
>  	trace_dpu_crtc_vblank(DRMID(&dpu_crtc->base), en, dpu_crtc);
> -	if (dpu_crtc->enabled && !dpu_crtc->suspend) {
> +	if (dpu_crtc->enabled) {
>  		_dpu_crtc_vblank_enable_no_lock(dpu_crtc, en);
>  	}
>  	dpu_crtc->vblank_requested = en;
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
> index 3723b4830335..7dc181aabb4d 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
> @@ -133,7 +133,6 @@ struct dpu_crtc_frame_event {
>   * @play_count    : frame count between crtc enable and disable
>   * @vblank_cb_time  : ktime at vblank count reset
>   * @vblank_requested : whether the user has requested vblank events
> - * @suspend         : whether or not a suspend operation is in progress
>   * @enabled       : whether the DPU CRTC is currently enabled. updated in the
>   *                  commit-thread, not state-swap time which is earlier, so
>   *                  safe to make decisions on during VBLANK on/off work
> @@ -169,7 +168,6 @@ struct dpu_crtc {
>  	u64 play_count;
>  	ktime_t vblank_cb_time;
>  	bool vblank_requested;
> -	bool suspend;
>  	bool enabled;
>  
>  	struct list_head feature_list;
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> index 1991cbe424a3..2a3625eef6d3 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
> @@ -135,9 +135,6 @@ struct dpu_kms {
>  
>  	struct dpu_core_perf perf;
>  
> -	/* saved atomic state during system suspend */
> -	struct drm_atomic_state *suspend_state;
> -
>  	struct dpu_rm rm;
>  	bool rm_init;
>  
> @@ -162,19 +159,6 @@ struct vsync_info {
>  #define ddev_to_msm_kms(D) ((D) && (D)->dev_private ? \
>  		((struct msm_drm_private *)((D)->dev_private))->kms : NULL)
>  
> -/**
> - * dpu_kms_is_suspend_state - whether or not the system is pm suspended
> - * @dev: Pointer to drm device
> - * Return: Suspend status
> - */
> -static inline bool dpu_kms_is_suspend_state(struct drm_device *dev)
> -{
> -	if (!ddev_to_msm_kms(dev))
> -		return false;
> -
> -	return to_dpu_kms(ddev_to_msm_kms(dev))->suspend_state != NULL;
> -}
> -
>  /**
>   * Debugfs functions - extra helper functions for debugfs support
>   *
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h
> index 636b31b0d311..0c122e173892 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h
> @@ -749,7 +749,6 @@ TRACE_EVENT(dpu_crtc_vblank_enable,
>  		__field(	uint32_t,		enc_id	)
>  		__field(	bool,			enable	)
>  		__field(	bool,			enabled )
> -		__field(	bool,			suspend )
>  		__field(	bool,			vblank_requested )
>  	),
>  	TP_fast_assign(
> @@ -757,15 +756,12 @@ TRACE_EVENT(dpu_crtc_vblank_enable,
>  		__entry->enc_id = enc_id;
>  		__entry->enable = enable;
>  		__entry->enabled = crtc->enabled;
> -		__entry->suspend = crtc->suspend;
>  		__entry->vblank_requested = crtc->vblank_requested;
>  	),
> -	TP_printk("id:%u encoder:%u enable:%s state{enabled:%s suspend:%s "
> -		  "vblank_req:%s}",
> +	TP_printk("id:%u encoder:%u enable:%s state{enabled:%s vblank_req:%s}",
>  		  __entry->drm_id, __entry->enc_id,
>  		  __entry->enable ? "true" : "false",
>  		  __entry->enabled ? "true" : "false",
> -		  __entry->suspend ? "true" : "false",
>  		  __entry->vblank_requested ? "true" : "false")
>  );
>  
> @@ -776,26 +772,19 @@ DECLARE_EVENT_CLASS(dpu_crtc_enable_template,
>  		__field(	uint32_t,		drm_id	)
>  		__field(	bool,			enable	)
>  		__field(	bool,			enabled )
> -		__field(	bool,			suspend )
>  		__field(	bool,			vblank_requested )
>  	),
>  	TP_fast_assign(
>  		__entry->drm_id = drm_id;
>  		__entry->enable = enable;
>  		__entry->enabled = crtc->enabled;
> -		__entry->suspend = crtc->suspend;
>  		__entry->vblank_requested = crtc->vblank_requested;
>  	),
> -	TP_printk("id:%u enable:%s state{enabled:%s suspend:%s vblank_req:%s}",
> +	TP_printk("id:%u enable:%s state{enabled:%s vblank_req:%s}",
>  		  __entry->drm_id, __entry->enable ? "true" : "false",
>  		  __entry->enabled ? "true" : "false",
> -		  __entry->suspend ? "true" : "false",
>  		  __entry->vblank_requested ? "true" : "false")
>  );
> -DEFINE_EVENT(dpu_crtc_enable_template, dpu_crtc_set_suspend,
> -	TP_PROTO(uint32_t drm_id, bool enable, struct dpu_crtc *crtc),
> -	TP_ARGS(drm_id, enable, crtc)
> -);
>  DEFINE_EVENT(dpu_crtc_enable_template, dpu_crtc_enable,
>  	TP_PROTO(uint32_t drm_id, bool enable, struct dpu_crtc *crtc),
>  	TP_ARGS(drm_id, enable, crtc)
> -- 
> 2.19.0.605.g01d371f741-goog
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS
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Re: [PATCH v3 4/4] drm/msm/dpu: Replace dpu_crtc_reset by atomic helper

[Sean Paul]

On Fri, Oct 05, 2018 at 05:04:03PM -0400, Bruce Wang wrote:
> Since we removed all suspend logic from the crtc code (see patch 3/4),
> dpu_crtc_reset does the same things as drm_atomic_helper_crtc_reset, so let's
> just replace it with a call to the atomic helper.
> 
> v3: added patch to patchset
> 
> Signed-off-by: Bruce Wang <bzwang@chromium.org>

Alllllllright!

Reviewed-by: Sean Paul <seanpaul@chromium.org>


> ---
>  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 39 +-----------------------
>  1 file changed, 1 insertion(+), 38 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> index ac604055a824..c5ba753d441c 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> @@ -844,43 +844,6 @@ static struct drm_crtc_state *dpu_crtc_duplicate_state(struct drm_crtc *crtc)
>  	return &cstate->base;
>  }
>  
> -/**
> - * dpu_crtc_reset - reset hook for CRTCs
> - * Resets the atomic state for @crtc by freeing the state pointer (which might
> - * be NULL, e.g. at driver load time) and allocating a new empty state object.
> - * @crtc: Pointer to drm crtc structure
> - */
> -static void dpu_crtc_reset(struct drm_crtc *crtc)
> -{
> -	struct dpu_crtc *dpu_crtc;
> -	struct dpu_crtc_state *cstate;
> -
> -	if (!crtc) {
> -		DPU_ERROR("invalid crtc\n");
> -		return;
> -	}
> -
> -	/* revert suspend actions, if necessary */
> -	if (dpu_kms_is_suspend_state(crtc->dev))
> -		_dpu_crtc_set_suspend(crtc, false);
> -
> -	/* remove previous state, if present */
> -	if (crtc->state) {
> -		dpu_crtc_destroy_state(crtc, crtc->state);
> -		crtc->state = 0;
> -	}
> -
> -	dpu_crtc = to_dpu_crtc(crtc);
> -	cstate = kzalloc(sizeof(*cstate), GFP_KERNEL);
> -	if (!cstate) {
> -		DPU_ERROR("failed to allocate state\n");
> -		return;
> -	}
> -
> -	cstate->base.crtc = crtc;
> -	crtc->state = &cstate->base;
> -}
> -
>  static void dpu_crtc_handle_power_event(u32 event_type, void *arg)
>  {
>  	struct drm_crtc *crtc = arg;
> @@ -1499,7 +1462,7 @@ static const struct drm_crtc_funcs dpu_crtc_funcs = {
>  	.set_config = drm_atomic_helper_set_config,
>  	.destroy = dpu_crtc_destroy,
>  	.page_flip = drm_atomic_helper_page_flip,
> -	.reset = dpu_crtc_reset,
> +	.reset = drm_atomic_helper_crtc_reset,
>  	.atomic_duplicate_state = dpu_crtc_duplicate_state,
>  	.atomic_destroy_state = dpu_crtc_destroy_state,
>  	.late_register = dpu_crtc_late_register,
> -- 
> 2.19.0.605.g01d371f741-goog
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS
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