drm/i915: Don't overestimate 4:2:0 link symbol clock

With 4:2:0 output the LS clock can be half of what it is with 4:4:4.
Make that happen.

Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190710125851.3275-1-ville.syrjala@linux.intel.com
Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Tested-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index a9db16de2999a152b448eb7a9d46b9082501443b..24592d985bcb5ffedc9a6485671d0f61161b24cd 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1854,8 +1854,10 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
        int mode_rate, link_clock, link_avail;
 
        for (bpp = limits->max_bpp; bpp >= limits->min_bpp; bpp -= 2 * 3) {
+               int output_bpp = intel_dp_output_bpp(pipe_config, bpp);
+
                mode_rate = intel_dp_link_required(adjusted_mode->crtc_clock,
-                                                  bpp);
+                                                  output_bpp);
 
                for (clock = limits->min_clock; clock <= limits->max_clock; clock++) {
                        for (lane_count = limits->min_lane_count;