drm/i915: Reuse intel_dp_supports_dsc() for MST

intel_dp_supports_dsc() now works for MST as well, reuse it.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240517145356.26103-6-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -1432,8 +1432,8 @@ bool intel_dp_supports_fec(struct intel_dp *intel_dp,
 		drm_dp_sink_supports_fec(connector->dp.fec_capability);
 }
 
-static bool intel_dp_supports_dsc(const struct intel_connector *connector,
-				  const struct intel_crtc_state *crtc_state)
+bool intel_dp_supports_dsc(const struct intel_connector *connector,
+			   const struct intel_crtc_state *crtc_state)
 {
 	if (!intel_dp_has_dsc(connector))
 		return false;

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

@@ -171,6 +171,9 @@ bool intel_dp_supports_fec(struct intel_dp *intel_dp,
 			   const struct intel_connector *connector,
 			   const struct intel_crtc_state *pipe_config);
 
+bool intel_dp_supports_dsc(const struct intel_connector *connector,
+			   const struct intel_crtc_state *crtc_state);
+
 u32 intel_dp_dsc_nearest_valid_bpp(struct drm_i915_private *i915, u32 bpp, u32 pipe_bpp);
 
 void intel_ddi_update_pipe(struct intel_atomic_state *state,

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

@@ -421,18 +421,6 @@ static int intel_dp_mst_update_slots(struct intel_encoder *encoder,
 	return 0;
 }
 
-static bool
-intel_dp_mst_dsc_source_support(const struct intel_crtc_state *crtc_state)
-{
-	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
-
-	/*
-	 * FIXME: Enabling DSC on ICL results in blank screen and FIFO pipe /
-	 * transcoder underruns, re-enable DSC after fixing this issue.
-	 */
-	return DISPLAY_VER(i915) >= 12 && intel_dsc_source_support(crtc_state);
-}
-
 static int mode_hblank_period_ns(const struct drm_display_mode *mode)
 {
 	return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(mode->htotal - mode->hdisplay,
@@ -477,7 +465,7 @@ adjust_limits_for_dsc_hblank_expansion_quirk(const struct intel_connector *conne
 		return true;
 
 	if (!dsc) {
-		if (intel_dp_mst_dsc_source_support(crtc_state)) {
+		if (intel_dp_supports_dsc(connector, crtc_state)) {
 			drm_dbg_kms(&i915->drm,
 				    "[CRTC:%d:%s][CONNECTOR:%d:%s] DSC needed by hblank expansion quirk\n",
 				    crtc->base.base.id, crtc->base.name,
@@ -623,7 +611,7 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
 			    str_yes_no(ret), str_yes_no(joiner_needs_dsc),
 			    str_yes_no(intel_dp->force_dsc_en));
 
-		if (!intel_dp_mst_dsc_source_support(pipe_config))
+		if (!intel_dp_supports_dsc(connector, pipe_config))
 			return -EINVAL;
 
 		if (!intel_dp_mst_compute_config_limits(intel_dp,