drm/msm: split power control from prepare/complete_commit

With atomic commit, ->prepare_commit() and ->complete_commit() may not
be evenly balanced (although ->complete_commit() will complete each
crtc that had been previously prepared).  So these will no longer be
a good place to enable/disable clocks needed for hw access.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Sean Paul <sean@poorly.run>

drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c

@@ -250,6 +250,18 @@ static void dpu_kms_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
 	dpu_crtc_vblank(crtc, false);
 }
 
+static void dpu_kms_enable_commit(struct msm_kms *kms)
+{
+	struct dpu_kms *dpu_kms = to_dpu_kms(kms);
+	pm_runtime_get_sync(&dpu_kms->pdev->dev);
+}
+
+static void dpu_kms_disable_commit(struct msm_kms *kms)
+{
+	struct dpu_kms *dpu_kms = to_dpu_kms(kms);
+	pm_runtime_put_sync(&dpu_kms->pdev->dev);
+}
+
 static void dpu_kms_prepare_commit(struct msm_kms *kms,
 		struct drm_atomic_state *state)
 {
@@ -269,7 +281,6 @@ static void dpu_kms_prepare_commit(struct msm_kms *kms,
 	if (!dev || !dev->dev_private)
 		return;
 	priv = dev->dev_private;
-	pm_runtime_get_sync(&dpu_kms->pdev->dev);
 
 	/* Call prepare_commit for all affected encoders */
 	for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
@@ -337,8 +348,6 @@ static void dpu_kms_complete_commit(struct msm_kms *kms, unsigned crtc_mask)
 	for_each_crtc_mask(dpu_kms->dev, crtc, crtc_mask)
 		dpu_crtc_complete_commit(crtc);
 
-	pm_runtime_put_sync(&dpu_kms->pdev->dev);
-
 	DPU_ATRACE_END("kms_complete_commit");
 }
 
@@ -684,6 +693,8 @@ static const struct msm_kms_funcs kms_funcs = {
 	.irq_preinstall  = dpu_irq_preinstall,
 	.irq_uninstall   = dpu_irq_uninstall,
 	.irq             = dpu_irq,
+	.enable_commit   = dpu_kms_enable_commit,
+	.disable_commit  = dpu_kms_disable_commit,
 	.prepare_commit  = dpu_kms_prepare_commit,
 	.flush_commit    = dpu_kms_flush_commit,
 	.commit          = dpu_kms_commit,

drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c

@@ -96,15 +96,24 @@ static int mdp4_hw_init(struct msm_kms *kms)
 	return ret;
 }
 
-static void mdp4_prepare_commit(struct msm_kms *kms, struct drm_atomic_state *state)
+static void mdp4_enable_commit(struct msm_kms *kms)
+{
+	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
+	mdp4_enable(mdp4_kms);
+}
+
+static void mdp4_disable_commit(struct msm_kms *kms)
 {
 	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
+	mdp4_disable(mdp4_kms);
+}
+
+static void mdp4_prepare_commit(struct msm_kms *kms, struct drm_atomic_state *state)
+{
 	int i;
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *crtc_state;
 
-	mdp4_enable(mdp4_kms);
-
 	/* see 119ecb7fd */
 	for_each_new_crtc_in_state(state, crtc, crtc_state, i)
 		drm_crtc_vblank_get(crtc);
@@ -132,8 +141,6 @@ static void mdp4_complete_commit(struct msm_kms *kms, unsigned crtc_mask)
 	/* see 119ecb7fd */
 	for_each_crtc_mask(mdp4_kms->dev, crtc, crtc_mask)
 		drm_crtc_vblank_put(crtc);
-
-	mdp4_disable(mdp4_kms);
 }
 
 static long mdp4_round_pixclk(struct msm_kms *kms, unsigned long rate,
@@ -185,6 +192,8 @@ static const struct mdp_kms_funcs kms_funcs = {
 		.irq             = mdp4_irq,
 		.enable_vblank   = mdp4_enable_vblank,
 		.disable_vblank  = mdp4_disable_vblank,
+		.enable_commit   = mdp4_enable_commit,
+		.disable_commit  = mdp4_disable_commit,
 		.prepare_commit  = mdp4_prepare_commit,
 		.flush_commit    = mdp4_flush_commit,
 		.wait_flush      = mdp4_wait_flush,

drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c

@@ -146,16 +146,25 @@ static int mdp5_global_obj_init(struct mdp5_kms *mdp5_kms)
 	return 0;
 }
 
+static void mdp5_enable_commit(struct msm_kms *kms)
+{
+	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
+	pm_runtime_get_sync(&mdp5_kms->pdev->dev);
+}
+
+static void mdp5_disable_commit(struct msm_kms *kms)
+{
+	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
+	pm_runtime_put_sync(&mdp5_kms->pdev->dev);
+}
+
 static void mdp5_prepare_commit(struct msm_kms *kms, struct drm_atomic_state *state)
 {
 	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
-	struct device *dev = &mdp5_kms->pdev->dev;
 	struct mdp5_global_state *global_state;
 
 	global_state = mdp5_get_existing_global_state(mdp5_kms);
 
-	pm_runtime_get_sync(dev);
-
 	if (mdp5_kms->smp)
 		mdp5_smp_prepare_commit(mdp5_kms->smp, &global_state->smp);
 }
@@ -177,15 +186,12 @@ static void mdp5_wait_flush(struct msm_kms *kms, unsigned crtc_mask)
 static void mdp5_complete_commit(struct msm_kms *kms, unsigned crtc_mask)
 {
 	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
-	struct device *dev = &mdp5_kms->pdev->dev;
 	struct mdp5_global_state *global_state;
 
 	global_state = mdp5_get_existing_global_state(mdp5_kms);
 
 	if (mdp5_kms->smp)
 		mdp5_smp_complete_commit(mdp5_kms->smp, &global_state->smp);
-
-	pm_runtime_put_sync(dev);
 }
 
 static long mdp5_round_pixclk(struct msm_kms *kms, unsigned long rate,
@@ -284,6 +290,8 @@ static const struct mdp_kms_funcs kms_funcs = {
 		.enable_vblank   = mdp5_enable_vblank,
 		.disable_vblank  = mdp5_disable_vblank,
 		.flush_commit    = mdp5_flush_commit,
+		.enable_commit   = mdp5_enable_commit,
+		.disable_commit  = mdp5_disable_commit,
 		.prepare_commit  = mdp5_prepare_commit,
 		.wait_flush      = mdp5_wait_flush,
 		.complete_commit = mdp5_complete_commit,

drivers/gpu/drm/msm/msm_atomic.c

@@ -49,6 +49,7 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state)
 	struct msm_kms *kms = priv->kms;
 	unsigned crtc_mask = get_crtc_mask(state);
 
+	kms->funcs->enable_commit(kms);
 	kms->funcs->prepare_commit(kms, state);
 
 	/*
@@ -69,6 +70,7 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state)
 
 	kms->funcs->wait_flush(kms, crtc_mask);
 	kms->funcs->complete_commit(kms, crtc_mask);
+	kms->funcs->disable_commit(kms);
 
 	drm_atomic_helper_commit_hw_done(state);
 

drivers/gpu/drm/msm/msm_kms.h

@@ -35,6 +35,16 @@ struct msm_kms_funcs {
 	 * Atomic commit handling:
 	 */
 
+	/**
+	 * Enable/disable power/clks needed for hw access done in other
+	 * commit related methods.
+	 *
+	 * If mdp4 is migrated to runpm, we could probably drop these
+	 * and use runpm directly.
+	 */
+	void (*enable_commit)(struct msm_kms *kms);
+	void (*disable_commit)(struct msm_kms *kms);
+
 	/**
 	 * Prepare for atomic commit.  This is called after any previous
 	 * (async or otherwise) commit has completed.