Commit f2c9df10 authored Sep 07, 2022 by Ville Syrjälä

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

parent c46af562

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

+2 −1

Original line number	Diff line number	Diff line
		@@ -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

+1 −1

Original line number	Diff line number	Diff line
		@@ -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)