drm/i915/dp: Factor out intel_dp_config_required_rate()

Factor out intel_dp_config_required_rate() used by a follow-up patch
enabling the DP tunnel BW allocation mode.
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240220211841.448846-7-imre.deak@intel.com

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

@@ -2343,6 +2343,17 @@ intel_dp_compute_config_limits(struct intel_dp *intel_dp,
 						       limits);
 }
 
+int intel_dp_config_required_rate(const struct intel_crtc_state *crtc_state)
+{
+	const struct drm_display_mode *adjusted_mode =
+		&crtc_state->hw.adjusted_mode;
+	int bpp = crtc_state->dsc.compression_enable ?
+		to_bpp_int_roundup(crtc_state->dsc.compressed_bpp_x16) :
+		crtc_state->pipe_bpp;
+
+	return intel_dp_link_required(adjusted_mode->crtc_clock, bpp);
+}
+
 static int
 intel_dp_compute_link_config(struct intel_encoder *encoder,
 			     struct intel_crtc_state *pipe_config,
@@ -2410,31 +2421,15 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
 			return ret;
 	}
 
-	if (pipe_config->dsc.compression_enable) {
 	drm_dbg_kms(&i915->drm,
-			    "DP lane count %d clock %d Input bpp %d Compressed bpp " BPP_X16_FMT "\n",
+		    "DP lane count %d clock %d bpp input %d compressed " BPP_X16_FMT " link rate required %d available %d\n",
 		    pipe_config->lane_count, pipe_config->port_clock,
 		    pipe_config->pipe_bpp,
-			    BPP_X16_ARGS(pipe_config->dsc.compressed_bpp_x16));
-
-		drm_dbg_kms(&i915->drm,
-			    "DP link rate required %i available %i\n",
-			    intel_dp_link_required(adjusted_mode->crtc_clock,
-						   to_bpp_int_roundup(pipe_config->dsc.compressed_bpp_x16)),
+		    BPP_X16_ARGS(pipe_config->dsc.compressed_bpp_x16),
+		    intel_dp_config_required_rate(pipe_config),
 		    drm_dp_max_dprx_data_rate(pipe_config->port_clock,
 					      pipe_config->lane_count));
-	} else {
-		drm_dbg_kms(&i915->drm, "DP lane count %d clock %d bpp %d\n",
-			    pipe_config->lane_count, pipe_config->port_clock,
-			    pipe_config->pipe_bpp);
 
-		drm_dbg_kms(&i915->drm,
-			    "DP link rate required %i available %i\n",
-			    intel_dp_link_required(adjusted_mode->crtc_clock,
-						   pipe_config->pipe_bpp),
-			    drm_dp_max_dprx_data_rate(pipe_config->port_clock,
-						      pipe_config->lane_count));
-	}
 	return 0;
 }
 

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

@@ -100,6 +100,7 @@ void intel_dp_mst_suspend(struct drm_i915_private *dev_priv);
 void intel_dp_mst_resume(struct drm_i915_private *dev_priv);
 int intel_dp_max_link_rate(struct intel_dp *intel_dp);
 int intel_dp_max_lane_count(struct intel_dp *intel_dp);
+int intel_dp_config_required_rate(const struct intel_crtc_state *crtc_state);
 int intel_dp_rate_select(struct intel_dp *intel_dp, int rate);
 
 void intel_dp_compute_rate(struct intel_dp *intel_dp, int port_clock,