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

[Bruce Wang <bzwang-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>]

dpu_crtc_enable/disable/reset are only being called upon
initialization/destruction of the device and as part of the PM
suspend/resume handling. Since core suspend and resume calls
are guarenteed to not overlap with one another we don't need to
track whether or not we're in a suspended state from inside the crtc.
This patch removes the suspend logic from the crtc, and removes the relevant
tracing from dpu_trace.

Signed-off-by: Bruce Wang <bzwang@chromium.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c  | 61 ++---------------------
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h  |  2 -
 drivers/gpu/drm/msm/disp/dpu1/dpu_trace.h | 15 +-----
 3 files changed, 7 insertions(+), 71 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..31e372554e0c 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
@@ -881,25 +852,14 @@ static struct drm_crtc_state *dpu_crtc_duplicate_state(struct drm_crtc *crtc)
  */
 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;
+		crtc->state = NULL;
 	}
 
-	dpu_crtc = to_dpu_crtc(crtc);
 	cstate = kzalloc(sizeof(*cstate), GFP_KERNEL);
 	if (!cstate) {
 		DPU_ERROR("failed to allocate state\n");
@@ -951,9 +911,6 @@ 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 +923,7 @@ 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 +989,7 @@ 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 +1244,11 @@ 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_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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