Re: [Intel-gfx] [PATCH 16/26] drm/i915: Make all clock checks non-fuzzy

[Jani Nikula <jani.nikula@linux.intel.com>]

On Tue, 03 May 2022, Ville Syrjala <ville.syrjala@linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> Now that we backfeed the actual DPLL frequency into the
> compute crtc state all our clocks should come out exact.

/me looks at where intel_fuzzy_clock_check() is still used, and it's of
course DSI. Maybe we could move the function there until we figure it
out.

Reviewed-by: Jani Nikula <jani.nikula@intel.com>

>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 22 +++++---------------
>  1 file changed, 5 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 198c6340a463..066b9e7a5696 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -6118,16 +6118,6 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
>  	} \
>  } while (0)
>  
> -#define PIPE_CONF_CHECK_CLOCK_FUZZY(name) do { \
> -	if (!intel_fuzzy_clock_check(current_config->name, pipe_config->name)) { \
> -		pipe_config_mismatch(fastset, crtc, __stringify(name), \
> -				     "(expected %i, found %i)", \
> -				     current_config->name, \
> -				     pipe_config->name); \
> -		ret = false; \
> -	} \
> -} while (0)
> -
>  #define PIPE_CONF_CHECK_INFOFRAME(name) do { \
>  	if (!intel_compare_infoframe(&current_config->infoframes.name, \
>  				     &pipe_config->infoframes.name)) { \
> @@ -6242,7 +6232,7 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
>  		PIPE_CONF_CHECK_RECT(pch_pfit.dst);
>  
>  		PIPE_CONF_CHECK_I(scaler_state.scaler_id);
> -		PIPE_CONF_CHECK_CLOCK_FUZZY(pixel_rate);
> +		PIPE_CONF_CHECK_I(pixel_rate);
>  
>  		PIPE_CONF_CHECK_X(gamma_mode);
>  		if (IS_CHERRYVIEW(dev_priv))
> @@ -6312,9 +6302,9 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
>  	if (IS_G4X(dev_priv) || DISPLAY_VER(dev_priv) >= 5)
>  		PIPE_CONF_CHECK_I(pipe_bpp);
>  
> -	PIPE_CONF_CHECK_CLOCK_FUZZY(hw.pipe_mode.crtc_clock);
> -	PIPE_CONF_CHECK_CLOCK_FUZZY(hw.adjusted_mode.crtc_clock);
> -	PIPE_CONF_CHECK_CLOCK_FUZZY(port_clock);
> +	PIPE_CONF_CHECK_I(hw.pipe_mode.crtc_clock);
> +	PIPE_CONF_CHECK_I(hw.adjusted_mode.crtc_clock);
> +	PIPE_CONF_CHECK_I(port_clock);
>  
>  	PIPE_CONF_CHECK_I(min_voltage_level);
>  
> @@ -6358,7 +6348,6 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config,
>  #undef PIPE_CONF_CHECK_BOOL_INCOMPLETE
>  #undef PIPE_CONF_CHECK_P
>  #undef PIPE_CONF_CHECK_FLAGS
> -#undef PIPE_CONF_CHECK_CLOCK_FUZZY
>  #undef PIPE_CONF_CHECK_COLOR_LUT
>  #undef PIPE_CONF_CHECK_TIMINGS
>  #undef PIPE_CONF_CHECK_RECT
> @@ -6379,8 +6368,7 @@ static void intel_pipe_config_sanity_check(struct drm_i915_private *dev_priv,
>  		 * FDI already provided one idea for the dotclock.
>  		 * Yell if the encoder disagrees.
>  		 */
> -		drm_WARN(&dev_priv->drm,
> -			 !intel_fuzzy_clock_check(fdi_dotclock, dotclock),
> +		drm_WARN(&dev_priv->drm, fdi_dotclock != dotclock,
>  			 "FDI dotclock and encoder dotclock mismatch, fdi: %i, encoder: %i\n",
>  			 fdi_dotclock, dotclock);
>  	}

-- 
Jani Nikula, Intel Open Source Graphics Center