drm/i915/dsc: move DP specific compute params to intel_dp.c

Turns out future DSI specific parameters aren't workable with the
approach of having the encoder specific functions in intel_vdsc.c. Make
intel_dsc_compute_params() a helper that does the encoder independent
parts, and have encoder code call it. Move intel_dsc_dp_compute_params()
to intel_dp.c as intel_dp_dsc_compute_params().

No functional changes.

v2: Rename pipe_config to crtc_state while at it.

Cc: Manasi Navare <manasi.d.navare@intel.com>
Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/620688ec302f7f49cc539c6c1653bfaf6092fce0.1575974743.git.jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_dp.c

@@ -2046,6 +2046,51 @@ static int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 dsc_max_bpc)
 	return 0;
 }
 
+#define DSC_SUPPORTED_VERSION_MIN		1
+
+static int intel_dp_dsc_compute_params(struct intel_encoder *encoder,
+				       struct intel_crtc_state *crtc_state)
+{
+	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
+	struct drm_dsc_config *vdsc_cfg = &crtc_state->dsc.config;
+	u8 line_buf_depth;
+	int ret;
+
+	ret = intel_dsc_compute_params(encoder, crtc_state);
+	if (ret)
+		return ret;
+
+	vdsc_cfg->dsc_version_major =
+		(intel_dp->dsc_dpcd[DP_DSC_REV - DP_DSC_SUPPORT] &
+		 DP_DSC_MAJOR_MASK) >> DP_DSC_MAJOR_SHIFT;
+	vdsc_cfg->dsc_version_minor =
+		min(DSC_SUPPORTED_VERSION_MIN,
+		    (intel_dp->dsc_dpcd[DP_DSC_REV - DP_DSC_SUPPORT] &
+		     DP_DSC_MINOR_MASK) >> DP_DSC_MINOR_SHIFT);
+
+	vdsc_cfg->convert_rgb = intel_dp->dsc_dpcd[DP_DSC_DEC_COLOR_FORMAT_CAP - DP_DSC_SUPPORT] &
+		DP_DSC_RGB;
+
+	line_buf_depth = drm_dp_dsc_sink_line_buf_depth(intel_dp->dsc_dpcd);
+	if (!line_buf_depth) {
+		DRM_DEBUG_KMS("DSC Sink Line Buffer Depth invalid\n");
+		return -EINVAL;
+	}
+
+	if (vdsc_cfg->dsc_version_minor == 2)
+		vdsc_cfg->line_buf_depth = (line_buf_depth == DSC_1_2_MAX_LINEBUF_DEPTH_BITS) ?
+			DSC_1_2_MAX_LINEBUF_DEPTH_VAL : line_buf_depth;
+	else
+		vdsc_cfg->line_buf_depth = (line_buf_depth > DSC_1_1_MAX_LINEBUF_DEPTH_BITS) ?
+			DSC_1_1_MAX_LINEBUF_DEPTH_BITS : line_buf_depth;
+
+	vdsc_cfg->block_pred_enable =
+		intel_dp->dsc_dpcd[DP_DSC_BLK_PREDICTION_SUPPORT - DP_DSC_SUPPORT] &
+		DP_DSC_BLK_PREDICTION_IS_SUPPORTED;
+
+	return drm_dsc_compute_rc_parameters(vdsc_cfg);
+}
+
 static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
 				       struct intel_crtc_state *pipe_config,
 				       struct drm_connector_state *conn_state,
@@ -2132,7 +2177,7 @@ static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
 		}
 	}
 
-	ret = intel_dsc_compute_params(&dig_port->base, pipe_config);
+	ret = intel_dp_dsc_compute_params(&dig_port->base, pipe_config);
 	if (ret < 0) {
 		DRM_DEBUG_KMS("Cannot compute valid DSC parameters for Input Bpp = %d "
 			      "Compressed BPP = %d\n",

drivers/gpu/drm/i915/display/intel_vdsc.c

@@ -30,8 +30,6 @@ enum COLUMN_INDEX_BPC {
 	MAX_COLUMN_INDEX
 };
 
-#define DSC_SUPPORTED_VERSION_MIN		1
-
 /* From DSC_v1.11 spec, rc_parameter_Set syntax element typically constant */
 static const u16 rc_buf_thresh[] = {
 	896, 1792, 2688, 3584, 4480, 5376, 6272, 6720, 7168, 7616,
@@ -335,45 +333,6 @@ static const struct rc_parameters *get_rc_params(u16 compressed_bpp,
 	return &rc_parameters[row_index][column_index];
 }
 
-/* Values filled from DSC Sink DPCD */
-static int intel_dsc_dp_compute_params(struct intel_encoder *encoder,
-				       struct intel_crtc_state *pipe_config)
-{
-	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
-	struct drm_dsc_config *vdsc_cfg = &pipe_config->dsc.config;
-	u8 line_buf_depth;
-
-	vdsc_cfg->dsc_version_major =
-		(intel_dp->dsc_dpcd[DP_DSC_REV - DP_DSC_SUPPORT] &
-		 DP_DSC_MAJOR_MASK) >> DP_DSC_MAJOR_SHIFT;
-	vdsc_cfg->dsc_version_minor =
-		min(DSC_SUPPORTED_VERSION_MIN,
-		    (intel_dp->dsc_dpcd[DP_DSC_REV - DP_DSC_SUPPORT] &
-		     DP_DSC_MINOR_MASK) >> DP_DSC_MINOR_SHIFT);
-
-	vdsc_cfg->convert_rgb = intel_dp->dsc_dpcd[DP_DSC_DEC_COLOR_FORMAT_CAP - DP_DSC_SUPPORT] &
-		DP_DSC_RGB;
-
-	line_buf_depth = drm_dp_dsc_sink_line_buf_depth(intel_dp->dsc_dpcd);
-	if (!line_buf_depth) {
-		DRM_DEBUG_KMS("DSC Sink Line Buffer Depth invalid\n");
-		return -EINVAL;
-	}
-
-	if (vdsc_cfg->dsc_version_minor == 2)
-		vdsc_cfg->line_buf_depth = (line_buf_depth == DSC_1_2_MAX_LINEBUF_DEPTH_BITS) ?
-			DSC_1_2_MAX_LINEBUF_DEPTH_VAL : line_buf_depth;
-	else
-		vdsc_cfg->line_buf_depth = (line_buf_depth > DSC_1_1_MAX_LINEBUF_DEPTH_BITS) ?
-			DSC_1_1_MAX_LINEBUF_DEPTH_BITS : line_buf_depth;
-
-	vdsc_cfg->block_pred_enable =
-			intel_dp->dsc_dpcd[DP_DSC_BLK_PREDICTION_SUPPORT - DP_DSC_SUPPORT] &
-		DP_DSC_BLK_PREDICTION_IS_SUPPORTED;
-
-	return 0;
-}
-
 int intel_dsc_compute_params(struct intel_encoder *encoder,
 			     struct intel_crtc_state *pipe_config)
 {
@@ -381,7 +340,6 @@ int intel_dsc_compute_params(struct intel_encoder *encoder,
 	u16 compressed_bpp = pipe_config->dsc.compressed_bpp;
 	const struct rc_parameters *rc_params;
 	u8 i = 0;
-	int ret;
 
 	vdsc_cfg->pic_width = pipe_config->hw.adjusted_mode.crtc_hdisplay;
 	vdsc_cfg->pic_height = pipe_config->hw.adjusted_mode.crtc_vdisplay;
@@ -470,11 +428,7 @@ int intel_dsc_compute_params(struct intel_encoder *encoder,
 	vdsc_cfg->initial_scale_value = (vdsc_cfg->rc_model_size << 3) /
 		(vdsc_cfg->rc_model_size - vdsc_cfg->initial_offset);
 
-	ret = intel_dsc_dp_compute_params(encoder, pipe_config);
-	if (ret)
-		return ret;
-
-	return drm_dsc_compute_rc_parameters(vdsc_cfg);
+	return 0;
 }
 
 enum intel_display_power_domain