drm/i915/dp: Extract intel_dp_tmds_clock_valid()

We're currently duplicating the DFP min/max TMDS clock checks
in .mode_valid() and .compute_config(). Extract a helper suitable
for both use cases.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220322120015.28074-2-ville.syrjala@linux.intel.com
Reviewed-by: Uma Shankar <uma.shankar@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 5430d3a..3611e2c 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -830,13 +830,31 @@ static bool intel_dp_hdisplay_bad(struct drm_i915_private *dev_priv,
 }
 
 static enum drm_mode_status
+intel_dp_tmds_clock_valid(struct intel_dp *intel_dp,
+                         int clock, int bpc, bool ycbcr420_output)
+{
+       int tmds_clock;
+
+       tmds_clock = intel_hdmi_tmds_clock(clock, bpc, ycbcr420_output);
+
+       if (intel_dp->dfp.min_tmds_clock &&
+           tmds_clock < intel_dp->dfp.min_tmds_clock)
+               return MODE_CLOCK_LOW;
+
+       if (intel_dp->dfp.max_tmds_clock &&
+           tmds_clock > intel_dp->dfp.max_tmds_clock)
+               return MODE_CLOCK_HIGH;
+
+       return MODE_OK;
+}
+
+static enum drm_mode_status
 intel_dp_mode_valid_downstream(struct intel_connector *connector,
                               const struct drm_display_mode *mode,
                               int target_clock)
 {
        struct intel_dp *intel_dp = intel_attached_dp(connector);
        const struct drm_display_info *info = &connector->base.display_info;
-       int tmds_clock;
 
        /* If PCON supports FRL MODE, check FRL bandwidth constraints */
        if (intel_dp->dfp.pcon_max_frl_bw) {
@@ -862,17 +880,8 @@ 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 = 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)
-               return MODE_CLOCK_LOW;
-       if (intel_dp->dfp.max_tmds_clock &&
-           tmds_clock > intel_dp->dfp.max_tmds_clock)
-               return MODE_CLOCK_HIGH;
-
-       return MODE_OK;
+       return intel_dp_tmds_clock_valid(intel_dp, target_clock, 8,
+                                        drm_mode_is_420_only(info, mode));
 }
 
 static bool intel_dp_need_bigjoiner(struct intel_dp *intel_dp,
@@ -1115,32 +1124,16 @@ static bool intel_dp_hdmi_ycbcr420(struct intel_dp *intel_dp,
                 intel_dp->dfp.ycbcr_444_to_420);
 }
 
-static bool intel_dp_hdmi_tmds_clock_valid(struct intel_dp *intel_dp,
-                                          const struct intel_crtc_state *crtc_state, int 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)
-               return false;
-
-       if (intel_dp->dfp.max_tmds_clock &&
-           tmds_clock > intel_dp->dfp.max_tmds_clock)
-               return false;
-
-       return true;
-}
-
 static bool intel_dp_hdmi_bpc_possible(struct intel_dp *intel_dp,
                                       const struct intel_crtc_state *crtc_state,
                                       int bpc)
 {
+       bool ycbcr420_output = intel_dp_hdmi_ycbcr420(intel_dp, crtc_state);
+       int clock = crtc_state->hw.adjusted_mode.crtc_clock;
 
-       return intel_hdmi_bpc_possible(crtc_state, bpc, intel_dp->has_hdmi_sink,
-                                      intel_dp_hdmi_ycbcr420(intel_dp, crtc_state)) &&
-               intel_dp_hdmi_tmds_clock_valid(intel_dp, crtc_state, bpc);
+       return intel_hdmi_bpc_possible(crtc_state, bpc,
+                                      intel_dp->has_hdmi_sink, ycbcr420_output) &&
+               intel_dp_tmds_clock_valid(intel_dp, clock, bpc, ycbcr420_output) == MODE_OK;
 }
 
 static int intel_dp_max_bpp(struct intel_dp *intel_dp,