drm/i915/dp: Reuse intel_hdmi_tmds_clock()

Reuse intel_hdmi_tmds_clock() for DP->HDMI TMDS clock calculations.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211015133921.4609-9-ville.syrjala@linux.intel.comReviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>

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

@@ -886,9 +886,8 @@ intel_dp_mode_valid_downstream(struct intel_connector *connector,
 		return MODE_CLOCK_HIGH;
 
 	/* Assume 8bpc for the DP++/HDMI/DVI TMDS clock check */
-	tmds_clock = target_clock;
-	if (drm_mode_is_420_only(info, mode))
-		tmds_clock /= 2;
+	tmds_clock = intel_hdmi_tmds_clock(target_clock, 8,
+					   drm_mode_is_420_only(info, mode));
 
 	if (intel_dp->dfp.min_tmds_clock &&
 	    tmds_clock < intel_dp->dfp.min_tmds_clock)
@@ -1139,21 +1138,12 @@ static bool intel_dp_hdmi_ycbcr420(struct intel_dp *intel_dp,
 		 intel_dp->dfp.ycbcr_444_to_420);
 }
 
-static int intel_dp_hdmi_tmds_clock(struct intel_dp *intel_dp,
-				    const struct intel_crtc_state *crtc_state, int bpc)
-{
-	int clock = crtc_state->hw.adjusted_mode.crtc_clock * bpc / 8;
-
-	if (intel_dp_hdmi_ycbcr420(intel_dp, crtc_state))
-		clock /= 2;
-
-	return clock;
-}
-
 static bool intel_dp_hdmi_tmds_clock_valid(struct intel_dp *intel_dp,
 					   const struct intel_crtc_state *crtc_state, int bpc)
 {
-	int tmds_clock = intel_dp_hdmi_tmds_clock(intel_dp, crtc_state, bpc);
+	int clock = crtc_state->hw.adjusted_mode.crtc_clock;
+	int tmds_clock = intel_hdmi_tmds_clock(clock, bpc,
+					       intel_dp_hdmi_ycbcr420(intel_dp, crtc_state));
 
 	if (intel_dp->dfp.min_tmds_clock &&
 	    tmds_clock < intel_dp->dfp.min_tmds_clock)

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

@@ -1869,7 +1869,7 @@ hdmi_port_clock_valid(struct intel_hdmi *hdmi,
 	return MODE_OK;
 }
 
-static int intel_hdmi_tmds_clock(int clock, int bpc, bool ycbcr420_output)
+int intel_hdmi_tmds_clock(int clock, int bpc, bool ycbcr420_output)
 {
 	/* YCBCR420 TMDS rate requirement is half the pixel clock */
 	if (ycbcr420_output)

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

@@ -46,6 +46,7 @@ bool intel_hdmi_limited_color_range(const struct intel_crtc_state *crtc_state,
 				    const struct drm_connector_state *conn_state);
 bool intel_hdmi_bpc_possible(const struct intel_crtc_state *crtc_state,
 			     int bpc, bool has_hdmi_sink, bool ycbcr420_output);
+int intel_hdmi_tmds_clock(int clock, int bpc, bool ycbcr420_output);
 int intel_hdmi_dsc_get_bpp(int src_fractional_bpp, int slice_width,
 			   int num_slices, int output_format, bool hdmi_all_bpp,
 			   int hdmi_max_chunk_bytes);