Re: [PATCH 02/11] [v2] drm/i915: Extract i9xx_get_color_config()

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

On Mon, 15 Apr 2019, Swati Sharma <swati2.sharma@intel.com> wrote:
> Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h    |  3 +++
>  drivers/gpu/drm/i915/intel_color.c | 51 ++++++++++++++++++++++++++++++++++++++
>  2 files changed, 54 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 9c206e8..8f2ae8a 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -7175,6 +7175,9 @@ enum {
>  /* legacy palette */
>  #define _LGC_PALETTE_A           0x4a000
>  #define _LGC_PALETTE_B           0x4a800
> +#define LGC_PALETTE_RED_MASK     REG_GENMASK(23, 16)
> +#define LGC_PALETTE_GREEN_MASK   REG_GENMASK(15, 8)
> +#define LGC_PALETTE_BLUE_MASK    REG_GENMASK(7, 0)
>  #define LGC_PALETTE(pipe, i) _MMIO(_PIPE(pipe, _LGC_PALETTE_A, _LGC_PALETTE_B) + (i) * 4)
>  
>  /* ilk/snb precision palette */
> diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
> index 321cf52..f394402 100644
> --- a/drivers/gpu/drm/i915/intel_color.c
> +++ b/drivers/gpu/drm/i915/intel_color.c
> @@ -1228,6 +1228,56 @@ static int icl_color_check(struct intel_crtc_state *crtc_state)
>  	return 0;
>  }
>  
> +/* convert hw value with given bit_precision to lut property val */
> +static u32 intel_color_lut_pack(u32 val, u32 bit_precision)
> +{
> +	u32 max = 0xffff >> (16 - bit_precision);
> +
> +	val = clamp_val(val, 0, max);
> +
> +	if (bit_precision < 16)
> +		val <<= 16 - bit_precision;
> +
> +	return val;
> +}
> +
> +static void i9xx_get_config_internal(struct intel_crtc_state *crtc_state)
> +{
> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
> +	struct drm_device *dev = crtc->base.dev;
> +	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> +	enum pipe pipe = crtc->pipe;
> +	struct drm_property_blob *blob = NULL;

No need to initialize.

> +	struct drm_color_lut *blob_data;
> +	u32 i, val;
> +
> +	blob = drm_property_create_blob(dev,

You can drop the dev local var as it's simply &dev_priv->drm.

> +					sizeof(struct drm_color_lut) * 256,
> +					NULL);
> +	if (IS_ERR(blob))
> +		return;
> +
> +	blob_data = blob->data;
> +
> +	for (i = 0; i < 256; i++) {
> +		if (HAS_GMCH(dev_priv))
> +			val = I915_READ(PALETTE(pipe, i));
> +		else
> +			val = I915_READ(LGC_PALETTE(pipe, i));
> +
> +		blob_data[i].red = intel_color_lut_pack(REG_FIELD_GET(LGC_PALETTE_RED_MASK, val) >> 16, 8);
> +		blob_data[i].green = intel_color_lut_pack(REG_FIELD_GET(LGC_PALETTE_GREEN_MASK, val) >> 8, 8);
> +		blob_data[i].blue = intel_color_lut_pack(REG_FIELD_GET(LGC_PALETTE_BLUE_MASK, val), 8);

REG_FIELD_GET() return the fields already shifted down according to the
mask. So the right shifts here are not needed.

> +	}
> +
> +	crtc_state->base.gamma_lut = blob;
> +}
> +
> +static void i9xx_get_color_config(struct intel_crtc_state *crtc_state)
> +{
> +	i9xx_get_config_internal(crtc_state);
> +}
> +
>  void intel_color_init(struct intel_crtc *crtc)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> @@ -1248,6 +1298,7 @@ void intel_color_init(struct intel_crtc *crtc)
>  			dev_priv->display.color_check = i9xx_color_check;
>  			dev_priv->display.color_commit = i9xx_color_commit;
>  			dev_priv->display.load_luts = i9xx_load_luts;
> +			dev_priv->display.get_color_config = i9xx_get_color_config;
>  		}
>  	} else {
>  		if (INTEL_GEN(dev_priv) >= 11)

-- 
Jani Nikula, Intel Open Source Graphics Center
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