drm/msm: add kms->wait_flush()

First step in re-working the atomic related internal API to prepare for
async updates pending.. ->wait_flush() is intended to block until there
is no in-progress flush.

A crtc_mask is used, rather than an atomic state object, as this will
later be used for async flush after the atomic state is destroyed.

This replaces ->wait_for_crtc_commit_done()

v2: update for review comments
Signed-off-by: Rob Clark <robdclark@chromium.org>

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

@@ -390,6 +390,15 @@ static void dpu_kms_wait_for_commit_done(struct msm_kms *kms,
 	}
 }
 
+static void dpu_kms_wait_flush(struct msm_kms *kms, unsigned crtc_mask)
+{
+	struct dpu_kms *dpu_kms = to_dpu_kms(kms);
+	struct drm_crtc *crtc;
+
+	for_each_crtc_mask(dpu_kms->dev, crtc, crtc_mask)
+		dpu_kms_wait_for_commit_done(kms, crtc);
+}
+
 static int _dpu_kms_initialize_dsi(struct drm_device *dev,
 				    struct msm_drm_private *priv,
 				    struct dpu_kms *dpu_kms)
@@ -684,8 +693,8 @@ static const struct msm_kms_funcs kms_funcs = {
 	.irq             = dpu_irq,
 	.prepare_commit  = dpu_kms_prepare_commit,
 	.commit          = dpu_kms_commit,
+	.wait_flush      = dpu_kms_wait_flush,
 	.complete_commit = dpu_kms_complete_commit,
-	.wait_for_crtc_commit_done = dpu_kms_wait_for_commit_done,
 	.enable_vblank   = dpu_kms_enable_vblank,
 	.disable_vblank  = dpu_kms_disable_vblank,
 	.check_modified_format = dpu_format_check_modified_format,

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

@@ -110,6 +110,15 @@ static void mdp4_prepare_commit(struct msm_kms *kms, struct drm_atomic_state *st
 		drm_crtc_vblank_get(crtc);
 }
 
+static void mdp4_wait_flush(struct msm_kms *kms, unsigned crtc_mask)
+{
+	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
+	struct drm_crtc *crtc;
+
+	for_each_crtc_mask(mdp4_kms->dev, crtc, crtc_mask)
+		mdp4_crtc_wait_for_commit_done(crtc);
+}
+
 static void mdp4_complete_commit(struct msm_kms *kms, struct drm_atomic_state *state)
 {
 	struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
@@ -126,12 +135,6 @@ static void mdp4_complete_commit(struct msm_kms *kms, struct drm_atomic_state *s
 	mdp4_disable(mdp4_kms);
 }
 
-static void mdp4_wait_for_crtc_commit_done(struct msm_kms *kms,
-						struct drm_crtc *crtc)
-{
-	mdp4_crtc_wait_for_commit_done(crtc);
-}
-
 static long mdp4_round_pixclk(struct msm_kms *kms, unsigned long rate,
 		struct drm_encoder *encoder)
 {
@@ -182,8 +185,8 @@ static const struct mdp_kms_funcs kms_funcs = {
 		.enable_vblank   = mdp4_enable_vblank,
 		.disable_vblank  = mdp4_disable_vblank,
 		.prepare_commit  = mdp4_prepare_commit,
+		.wait_flush      = mdp4_wait_flush,
 		.complete_commit = mdp4_complete_commit,
-		.wait_for_crtc_commit_done = mdp4_wait_for_crtc_commit_done,
 		.get_format      = mdp_get_format,
 		.round_pixclk    = mdp4_round_pixclk,
 		.destroy         = mdp4_destroy,

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

@@ -160,6 +160,15 @@ static void mdp5_prepare_commit(struct msm_kms *kms, struct drm_atomic_state *st
 		mdp5_smp_prepare_commit(mdp5_kms->smp, &global_state->smp);
 }
 
+static void mdp5_wait_flush(struct msm_kms *kms, unsigned crtc_mask)
+{
+	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
+	struct drm_crtc *crtc;
+
+	for_each_crtc_mask(mdp5_kms->dev, crtc, crtc_mask)
+		mdp5_crtc_wait_for_commit_done(crtc);
+}
+
 static void mdp5_complete_commit(struct msm_kms *kms, struct drm_atomic_state *state)
 {
 	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
@@ -176,12 +185,6 @@ static void mdp5_complete_commit(struct msm_kms *kms, struct drm_atomic_state *s
 	pm_runtime_put_sync(dev);
 }
 
-static void mdp5_wait_for_crtc_commit_done(struct msm_kms *kms,
-						struct drm_crtc *crtc)
-{
-	mdp5_crtc_wait_for_commit_done(crtc);
-}
-
 static long mdp5_round_pixclk(struct msm_kms *kms, unsigned long rate,
 		struct drm_encoder *encoder)
 {
@@ -278,8 +281,8 @@ static const struct mdp_kms_funcs kms_funcs = {
 		.enable_vblank   = mdp5_enable_vblank,
 		.disable_vblank  = mdp5_disable_vblank,
 		.prepare_commit  = mdp5_prepare_commit,
+		.wait_flush      = mdp5_wait_flush,
 		.complete_commit = mdp5_complete_commit,
-		.wait_for_crtc_commit_done = mdp5_wait_for_crtc_commit_done,
 		.get_format      = mdp_get_format,
 		.round_pixclk    = mdp5_round_pixclk,
 		.set_split_display = mdp5_set_split_display,

drivers/gpu/drm/msm/msm_atomic.c

@@ -12,28 +12,6 @@
 #include "msm_gem.h"
 #include "msm_kms.h"
 
-static void msm_atomic_wait_for_commit_done(struct drm_device *dev,
-		struct drm_atomic_state *old_state)
-{
-	struct drm_crtc *crtc;
-	struct drm_crtc_state *new_crtc_state;
-	struct msm_drm_private *priv = old_state->dev->dev_private;
-	struct msm_kms *kms = priv->kms;
-	int i;
-
-	for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
-		if (!new_crtc_state->active)
-			continue;
-
-		if (drm_crtc_vblank_get(crtc))
-			continue;
-
-		kms->funcs->wait_for_crtc_commit_done(kms, crtc);
-
-		drm_crtc_vblank_put(crtc);
-	}
-}
-
 int msm_atomic_prepare_fb(struct drm_plane *plane,
 			  struct drm_plane_state *new_state)
 {
@@ -48,11 +26,28 @@ int msm_atomic_prepare_fb(struct drm_plane *plane,
 	return msm_framebuffer_prepare(new_state->fb, kms->aspace);
 }
 
+/* Get bitmask of crtcs that will need to be flushed.  The bitmask
+ * can be used with for_each_crtc_mask() iterator, to iterate
+ * effected crtcs without needing to preserve the atomic state.
+ */
+static unsigned get_crtc_mask(struct drm_atomic_state *state)
+{
+	struct drm_crtc_state *crtc_state;
+	struct drm_crtc *crtc;
+	unsigned i, mask = 0;
+
+	for_each_new_crtc_in_state(state, crtc, crtc_state, i)
+		mask |= drm_crtc_mask(crtc);
+
+	return mask;
+}
+
 void msm_atomic_commit_tail(struct drm_atomic_state *state)
 {
 	struct drm_device *dev = state->dev;
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_kms *kms = priv->kms;
+	unsigned crtc_mask = get_crtc_mask(state);
 
 	kms->funcs->prepare_commit(kms, state);
 
@@ -67,8 +62,7 @@ void msm_atomic_commit_tail(struct drm_atomic_state *state)
 		kms->funcs->commit(kms, state);
 	}
 
-	msm_atomic_wait_for_commit_done(dev, state);
-
+	kms->funcs->wait_flush(kms, crtc_mask);
 	kms->funcs->complete_commit(kms, state);
 
 	drm_atomic_helper_commit_hw_done(state);

drivers/gpu/drm/msm/msm_kms.h

@@ -34,9 +34,8 @@ struct msm_kms_funcs {
 	void (*prepare_commit)(struct msm_kms *kms, struct drm_atomic_state *state);
 	void (*commit)(struct msm_kms *kms, struct drm_atomic_state *state);
 	void (*complete_commit)(struct msm_kms *kms, struct drm_atomic_state *state);
-	/* functions to wait for atomic commit completed on each CRTC */
-	void (*wait_for_crtc_commit_done)(struct msm_kms *kms,
-					struct drm_crtc *crtc);
+	void (*wait_flush)(struct msm_kms *kms, unsigned crtc_mask);
+
 	/* get msm_format w/ optional format modifiers from drm_mode_fb_cmd2 */
 	const struct msm_format *(*get_format)(struct msm_kms *kms,
 					const uint32_t format,
@@ -98,4 +97,8 @@ struct msm_mdss {
 int mdp5_mdss_init(struct drm_device *dev);
 int dpu_mdss_init(struct drm_device *dev);
 
+#define for_each_crtc_mask(dev, crtc, crtc_mask) \
+	drm_for_each_crtc(crtc, dev) \
+		for_each_if (drm_crtc_mask(crtc) & (crtc_mask))
+
 #endif /* __MSM_KMS_H__ */