drm/i915/display/dsc: Refactor intel_dp_dsc_compute_bpp

Move the platform specific max bpc calculation into
intel_dp_dsc_compute_bpp function

Cc: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210514153711.2359617-4-matthew.d.roper@intel.com

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

@@ -1097,10 +1097,18 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
 	return -EINVAL;
 }
 
-static int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 dsc_max_bpc)
+static int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 max_req_bpc)
 {
+	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 	int i, num_bpc;
 	u8 dsc_bpc[3] = {0};
+	u8 dsc_max_bpc;
+
+	/* Max DSC Input BPC for ICL is 10 and for TGL+ is 12 */
+	if (DISPLAY_VER(i915) >= 12)
+		dsc_max_bpc = min_t(u8, 12, max_req_bpc);
+	else
+		dsc_max_bpc = min_t(u8, 10, max_req_bpc);
 
 	num_bpc = drm_dp_dsc_sink_supported_input_bpcs(intel_dp->dsc_dpcd,
 						       dsc_bpc);
@@ -1188,7 +1196,6 @@ static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
 	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
 	const struct drm_display_mode *adjusted_mode =
 		&pipe_config->hw.adjusted_mode;
-	u8 dsc_max_bpc;
 	int pipe_bpp;
 	int ret;
 
@@ -1198,14 +1205,7 @@ static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
 	if (!intel_dp_supports_dsc(intel_dp, pipe_config))
 		return -EINVAL;
 
-	/* Max DSC Input BPC for ICL is 10 and for TGL+ is 12 */
-	if (DISPLAY_VER(dev_priv) >= 12)
-		dsc_max_bpc = min_t(u8, 12, conn_state->max_requested_bpc);
-	else
-		dsc_max_bpc = min_t(u8, 10,
-				    conn_state->max_requested_bpc);
-
-	pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, dsc_max_bpc);
+	pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, conn_state->max_requested_bpc);
 
 	/* Min Input BPC for ICL+ is 8 */
 	if (pipe_bpp < 8 * 3) {