Re: [PATCH v3 3/3] drm/msm/disp/dpu1: add color management support for the crtc

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On 18/11/2022 15:16, Kalyan Thota wrote:
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)

Signed-off-by: Kalyan Thota <quic_kalyant@xxxxxxxxxxx>

With two minor nits (stated below) fixed:

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>

---
  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    | 5 +++--
  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h    | 6 ++++--
  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 7 +++++--
  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c     | 7 ++++++-
  4 files changed, 18 insertions(+), 7 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..1ec9517 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
@@ -164,7 +165,7 @@ struct dpu_crtc {
  	u64 play_count;
  	ktime_t vblank_cb_time;
  	bool enabled;
-
+	bool color_enabled;

Keep the empty line after color_enabled please.

  	struct list_head feature_list;
  	struct list_head active_list;
  	struct list_head dirty_list;
@@ -269,10 +270,11 @@ 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 574f2b0..102612c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -572,6 +572,7 @@ 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};
@@ -600,7 +601,7 @@ 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;
@@ -635,6 +636,7 @@ 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;
@@ -645,6 +647,7 @@ 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;
@@ -670,7 +673,7 @@ 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 4784db8..b57e261 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -747,6 +747,7 @@ static int _dpu_kms_drm_obj_init(struct dpu_kms *dpu_kms)
int primary_planes_idx = 0, cursor_planes_idx = 0, i, ret;
  	int max_crtc_count;
+
  	dev = dpu_kms->dev;
  	priv = dev->dev_private;
  	catalog = dpu_kms->catalog;
@@ -804,7 +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) &&
+			encoder->encoder_type != DRM_MODE_ENCODER_VIRTUAL)

The last condition should be handled in the dpu_encoder_is_bultin()

+			_ctm = true;
+		crtc = dpu_crtc_init(dev, primary_planes[i], cursor_planes[i], _ctm);
  		if (IS_ERR(crtc)) {
  			ret = PTR_ERR(crtc);
  			return ret;

--
With best wishes
Dmitry




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