[PATCH v4 3/3] drm/msm/disp/dpu1: add color management support for the crtc

[Kalyan Thota]

Add color management support for the crtc provided there are
enough dspps that can be allocated from the catalog.

Changes in v1:
- cache color enabled state in the dpu crtc obj (Dmitry)
- simplify dspp allocation while creating crtc (Dmitry)
- register for color when crtc is created (Dmitry)

Changes in v2:
- avoid primary encoders in the documentation (Dmitry)

Changes in v3:
- add ctm for builtin encoders (Dmitry)

Changes in v4:
- few nits (Dmitry)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
Signed-off-by: Kalyan Thota <quic_kalyant at quicinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    | 5 +++--
 drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h    | 5 ++++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 7 +++++--
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c     | 6 +++++-
 4 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index 4170fbe..6cacaaf 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -1571,7 +1571,7 @@ static const struct drm_crtc_helper_funcs dpu_crtc_helper_funcs = {
 
 /* initialize crtc */
 struct drm_crtc *dpu_crtc_init(struct drm_device *dev, struct drm_plane *plane,
-				struct drm_plane *cursor)
+				struct drm_plane *cursor, bool ctm)
 {
 	struct drm_crtc *crtc = NULL;
 	struct dpu_crtc *dpu_crtc = NULL;
@@ -1583,6 +1583,7 @@ struct drm_crtc *dpu_crtc_init(struct drm_device *dev, struct drm_plane *plane,
 
 	crtc = &dpu_crtc->base;
 	crtc->dev = dev;
+	dpu_crtc->color_enabled = ctm;
 
 	spin_lock_init(&dpu_crtc->spin_lock);
 	atomic_set(&dpu_crtc->frame_pending, 0);
@@ -1604,7 +1605,7 @@ struct drm_crtc *dpu_crtc_init(struct drm_device *dev, struct drm_plane *plane,
 
 	drm_crtc_helper_add(crtc, &dpu_crtc_helper_funcs);
 
-	drm_crtc_enable_color_mgmt(crtc, 0, true, 0);
+	drm_crtc_enable_color_mgmt(crtc, 0, dpu_crtc->color_enabled, 0);
 
 	/* save user friendly CRTC name for later */
 	snprintf(dpu_crtc->name, DPU_CRTC_NAME_SIZE, "crtc%u", crtc->base.id);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
index 539b68b..792b4f0 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
@@ -136,6 +136,7 @@ struct dpu_crtc_frame_event {
  * @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
+ * @color_enabled : whether crtc supports color management
  * @feature_list  : list of color processing features supported on a crtc
  * @active_list   : list of color processing features are active
  * @dirty_list    : list of color processing features are dirty
@@ -164,6 +165,7 @@ struct dpu_crtc {
 	u64 play_count;
 	ktime_t vblank_cb_time;
 	bool enabled;
+	bool color_enabled;
 
 	struct list_head feature_list;
 	struct list_head active_list;
@@ -269,10 +271,11 @@ void dpu_crtc_complete_commit(struct drm_crtc *crtc);
  * @dev: dpu device
  * @plane: base plane
  * @cursor: cursor plane
+ * @ctm: ctm flag
  * @Return: new crtc object or error
  */
 struct drm_crtc *dpu_crtc_init(struct drm_device *dev, struct drm_plane *plane,
-			       struct drm_plane *cursor);
+			       struct drm_plane *cursor, bool ctm);
 
 /**
  * dpu_crtc_register_custom_event - api for enabling/disabling crtc event
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 96db7fb..a585036 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -571,6 +571,7 @@ bool dpu_encoder_use_dsc_merge(struct drm_encoder *drm_enc)
 static struct msm_display_topology dpu_encoder_get_topology(
 			struct dpu_encoder_virt *dpu_enc,
 			struct dpu_kms *dpu_kms,
+			struct dpu_crtc *dpu_crtc,
 			struct drm_display_mode *mode)
 {
 	struct msm_display_topology topology = {0};
@@ -599,7 +600,7 @@ static struct msm_display_topology dpu_encoder_get_topology(
 	else
 		topology.num_lm = (mode->hdisplay > MAX_HDISPLAY_SPLIT) ? 2 : 1;
 
-	if (dpu_enc->disp_info.intf_type == DRM_MODE_ENCODER_DSI) {
+	if (dpu_crtc->color_enabled) {
 		if (dpu_kms->catalog->dspp &&
 			(dpu_kms->catalog->dspp_count >= topology.num_lm))
 			topology.num_dspp = topology.num_lm;
@@ -634,6 +635,7 @@ static int dpu_encoder_virt_atomic_check(
 	struct drm_display_mode *adj_mode;
 	struct msm_display_topology topology;
 	struct dpu_global_state *global_state;
+	struct dpu_crtc *dpu_crtc;
 	int i = 0;
 	int ret = 0;
 
@@ -644,6 +646,7 @@ static int dpu_encoder_virt_atomic_check(
 	}
 
 	dpu_enc = to_dpu_encoder_virt(drm_enc);
+	dpu_crtc = to_dpu_crtc(crtc_state->crtc);
 	DPU_DEBUG_ENC(dpu_enc, "\n");
 
 	priv = drm_enc->dev->dev_private;
@@ -669,7 +672,7 @@ static int dpu_encoder_virt_atomic_check(
 		}
 	}
 
-	topology = dpu_encoder_get_topology(dpu_enc, dpu_kms, adj_mode);
+	topology = dpu_encoder_get_topology(dpu_enc, dpu_kms, dpu_crtc, adj_mode);
 
 	/* Reserve dynamic resources now. */
 	if (!ret) {
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index d967eef..53e0163 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -805,7 +805,11 @@ static int _dpu_kms_drm_obj_init(struct dpu_kms *dpu_kms)
 	/* Create one CRTC per encoder */
 	i = 0;
 	drm_for_each_encoder(encoder, dev) {
-		crtc = dpu_crtc_init(dev, primary_planes[i], cursor_planes[i]);
+		bool _ctm = false;
+
+		if (catalog->dspp_count && dpu_encoder_is_builtin(encoder))
+			_ctm = true;
+		crtc = dpu_crtc_init(dev, primary_planes[i], cursor_planes[i], _ctm);
 		if (IS_ERR(crtc)) {
 			ret = PTR_ERR(crtc);
 			return ret;
-- 
2.7.4