Re: [PATCH 11/20] drm/i915: prepare scaler for YCBCR420 modeset

"Sharma, Shashank" <shashank.sharma@xxxxxxxxx> · Thu, 13 Jul 2017 10:51:04 +0530

Regards

Shashank


On 7/12/2017 10:47 PM, Ville Syrjälä wrote:
On Mon, Jul 10, 2017 at 04:48:39PM +0530, Shashank Sharma wrote:
To get a YCBCR420 output from intel platforms, we need one
scaler to scale down YCBCR444 samples to YCBCR420 samples.

This patch:
- Does scaler allocation for HDMI ycbcr420 outputs.
- Programs PIPE_MISC register for ycbcr420 output.
- Adds a new scaler user "HDMI output" to plug-into existing
   scaler framework. This output type is identified using bit
   30 of the scaler users bitmap.

V2: rebase
V3: rebase
V4: rebase
V5: addressed review comments from Ander:
     - No need to check both scaler_user && hdmi_output.
       Check for scaler_user is enough.
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
---
  drivers/gpu/drm/i915/intel_atomic.c  |  6 ++++++
  drivers/gpu/drm/i915/intel_display.c | 23 +++++++++++++++++++++++
  drivers/gpu/drm/i915/intel_drv.h     | 10 +++++++++-
  drivers/gpu/drm/i915/intel_hdmi.c    | 12 ++++++++++++
  drivers/gpu/drm/i915/intel_panel.c   |  3 ++-
  5 files changed, 52 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
index 36d4e63..040d111 100644
--- a/drivers/gpu/drm/i915/intel_atomic.c
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -264,6 +264,12 @@ int intel_atomic_setup_scalers(struct drm_i915_private *dev_priv,
  
  			/* panel fitter case: assign as a crtc scaler */
  			scaler_id = &scaler_state->scaler_id;
+		} else if (i == SKL_420_OUTPUT_INDEX) {
I think Ander already said that we should just tie this into the normal
pfit pipe scaler user. I agree. Having to users doesn't actually make
sense because there can be only one pipe scaler, and if we want to do
scaled 4:2:0 output then we anyway need to handle both cases
simultaneosly.
I thought our idea of having a separate scalar user was a good one, 
because, this gives additional information
how and why the scalar is being used. Also, we dont program the other 
scaling factors in this case, but we get
the scaling profile set using PIPEMISC. So I would prefer to have this 
as a special case or separate user, but you
can think about this, and let me know.

- Shashank

+			name = "YCBCR420-OUTPUT";
+			idx = intel_crtc->base.base.id;
+
+			/* YCBCR420 case: needs a pipe scaler */
+			scaler_id = &scaler_state->scaler_id;
  		} else {
  			name = "PLANE";
  
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 01900e1..c56081e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4621,6 +4621,9 @@ skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
  	 */
  	need_scaling = src_w != dst_w || src_h != dst_h;
  
+	if (scaler_user == SKL_420_OUTPUT_INDEX)
+		need_scaling = true;
+
  	/*
  	 * if plane is being disabled or scaler is no more required or force detach
  	 *  - free scaler binded to this plane/crtc
@@ -4668,6 +4671,26 @@ skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
  }
  
  /**
+ * skl_update_scaler_crtc_420_output - Stages update to scaler state
+ * for YCBCR420 which needs a scaler, for downsampling.
+ *
+ * @state: crtc's scaler state
+ *
+ * Return
+ *     0 - scaler_usage updated successfully
+ *    error - requested scaling cannot be supported or other error condition
+ */
+int skl_update_scaler_crtc_420_output(struct intel_crtc_state *state)
+{
+	const struct drm_display_mode *mode = &state->base.adjusted_mode;
+
+	return skl_update_scaler(state, !state->base.active,
+		SKL_420_OUTPUT_INDEX, &state->scaler_state.scaler_id,
+		state->pipe_src_w, state->pipe_src_h,
+		mode->crtc_hdisplay, mode->crtc_vdisplay);
+}
+
+/**
   * skl_update_scaler_crtc - Stages update to scaler state for a given crtc.
   *
   * @state: crtc's scaler state
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 592243b..68b4fba 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -471,7 +471,8 @@ struct intel_crtc_scaler_state {
  	 *
  	 *     If a bit is set, a user is using a scaler.
  	 *     Here user can be a plane or crtc as defined below:
-	 *       bits 0-30 - plane (bit position is index from drm_plane_index)
+	 *       bits 0-29 - plane (bit position is index from drm_plane_index)
+	 *       bit 30    - hdmi output
  	 *       bit 31    - crtc
  	 *
  	 * Instead of creating a new index to cover planes and crtc, using
@@ -484,6 +485,12 @@ struct intel_crtc_scaler_state {
  	 * avilability.
  	 */
  #define SKL_CRTC_INDEX 31
+
+	/*
+	 * YCBCR 420 output consume a scaler. So adding a user
+	 * for 420 output requirement.
+	 */
+#define SKL_420_OUTPUT_INDEX 30
  	unsigned scaler_users;
  
  	/* scaler used by crtc for panel fitting purpose */
@@ -1483,6 +1490,7 @@ void intel_mode_from_pipe_config(struct drm_display_mode *mode,
  				 struct intel_crtc_state *pipe_config);
  
  int skl_update_scaler_crtc(struct intel_crtc_state *crtc_state);
+int skl_update_scaler_crtc_420_output(struct intel_crtc_state *state);
  int skl_max_scale(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state);
  
  static inline u32 intel_plane_ggtt_offset(const struct intel_plane_state *state)
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 276d916..9e8d784 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1355,6 +1355,7 @@ intel_hdmi_ycbcr420_config(struct drm_connector *connector,
  			       struct intel_crtc_state *config,
  			       int *clock_12bpc, int *clock_8bpc)
  {
+	struct intel_crtc *intel_crtc = to_intel_crtc(config->base.crtc);
  
  	if (!connector->ycbcr_420_allowed) {
  		DRM_ERROR("Platform doesn't support YCBCR420 output\n");
@@ -1366,6 +1367,17 @@ intel_hdmi_ycbcr420_config(struct drm_connector *connector,
  	*clock_12bpc /= 2;
  	*clock_8bpc /= 2;
  	config->ycbcr420 = true;
+
+	/* YCBCR 420 output conversion needs a scaler */
+	if (skl_update_scaler_crtc_420_output(config)) {
+		DRM_ERROR("Scaler allocation for output failed\n");
+		return false;
+	}
+
+	/* Bind this scaler to pipe */
+	intel_pch_panel_fitting(intel_crtc, config,
+				DRM_MODE_SCALE_FULLSCREEN);
+
  	return true;
  }
  
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 96c2cbd..fd2e081 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -110,7 +110,8 @@ intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
  
  	/* Native modes don't need fitting */
  	if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
-	    adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h)
+	    adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h &&
+	    !pipe_config->ycbcr420)
  		goto done;
  
  	switch (fitting_mode) {
--
2.7.4

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