drm/i915: Round TMDS clock to nearest

Use round-to-nearest behavour when calculating the TMDS clock.
Matches what we do for most other clock related things.
Acked-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907091057.11572-18-ville.syrjala@linux.intel.com

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

@@ -4505,7 +4505,8 @@ int intel_crtc_dotclock(const struct intel_crtc_state *pipe_config)
 		dotclock = intel_dotclock_calculate(pipe_config->port_clock,
 						    &pipe_config->dp_m_n);
 	else if (pipe_config->has_hdmi_sink && pipe_config->pipe_bpp > 24)
-		dotclock = pipe_config->port_clock * 24 / pipe_config->pipe_bpp;
+		dotclock = DIV_ROUND_CLOSEST(pipe_config->port_clock * 24,
+					     pipe_config->pipe_bpp);
 	else
 		dotclock = pipe_config->port_clock;
 

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

@@ -1892,7 +1892,7 @@ int intel_hdmi_tmds_clock(int clock, int bpc, bool ycbcr420_output)
 	 *  1.5x for 12bpc
 	 *  1.25x for 10bpc
 	 */
-	return clock * bpc / 8;
+	return DIV_ROUND_CLOSEST(clock * bpc, 8);
 }
 
 static bool intel_hdmi_source_bpc_possible(struct drm_i915_private *i915, int bpc)