Re: [PATCH 05/13] drm/i915: Pull GAMMA_MODE write out from haswell_load_luts()

[Matt Roper <matthew.d.roper@intel.com>]

On Fri, Jan 11, 2019 at 07:08:15PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> For bdw+ let's move the GAMMA_MODE write for the legacy LUT
> mode into the .load_luts() funciton directly, rather than
> relying on haswell_load_luts(). We'll be getting rid of
> haswell_load_luts() entirely soon, and it's anyway cleaner
> to have the GAMMA_MODE write in a single place.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>

> ---
>  drivers/gpu/drm/i915/intel_color.c | 36 +++++++++++++++++-------------
>  1 file changed, 20 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
> index 0dfd104b89d7..df3567686c45 100644
> --- a/drivers/gpu/drm/i915/intel_color.c
> +++ b/drivers/gpu/drm/i915/intel_color.c
> @@ -473,21 +473,20 @@ static void broadwell_load_luts(const struct intel_crtc_state *crtc_state)
>  	enum pipe pipe = crtc->pipe;
>  
>  	if (crtc_state_is_legacy_gamma(crtc_state)) {
> -		haswell_load_luts(crtc_state);
> -		return;
> -	}
> +		i9xx_load_luts(crtc_state);
> +	} else {
> +		bdw_load_degamma_lut(crtc_state);
> +		bdw_load_gamma_lut(crtc_state,
> +				   INTEL_INFO(dev_priv)->color.degamma_lut_size);
>  
> -	bdw_load_degamma_lut(crtc_state);
> -	bdw_load_gamma_lut(crtc_state,
> -			   INTEL_INFO(dev_priv)->color.degamma_lut_size);
> +		/*
> +		 * Reset the index, otherwise it prevents the legacy palette to be
> +		 * written properly.
> +		 */
> +		I915_WRITE(PREC_PAL_INDEX(pipe), 0);
> +	}
>  
>  	I915_WRITE(GAMMA_MODE(pipe), crtc_state->gamma_mode);
> -
> -	/*
> -	 * Reset the index, otherwise it prevents the legacy palette to be
> -	 * written properly.
> -	 */
> -	I915_WRITE(PREC_PAL_INDEX(pipe), 0);
>  }
>  
>  static void glk_load_degamma_lut(const struct intel_crtc_state *crtc_state)
> @@ -530,11 +529,16 @@ static void glk_load_luts(const struct intel_crtc_state *crtc_state)
>  	glk_load_degamma_lut(crtc_state);
>  
>  	if (crtc_state_is_legacy_gamma(crtc_state)) {
> -		haswell_load_luts(crtc_state);
> -		return;
> -	}
> +		i9xx_load_luts(crtc_state);
> +	} else {
> +		bdw_load_gamma_lut(crtc_state, 0);
>  
> -	bdw_load_gamma_lut(crtc_state, 0);
> +		/*
> +		 * Reset the index, otherwise it prevents the legacy palette to be
> +		 * written properly.
> +		 */
> +		I915_WRITE(PREC_PAL_INDEX(pipe), 0);
> +	}
>  
>  	I915_WRITE(GAMMA_MODE(pipe), crtc_state->gamma_mode);
>  }
> -- 
> 2.19.2
> 

-- 
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795
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