linux-kernel - Re: [PATCH v2 2/4] drm/komeda: Add drm_lut_to_fgamma

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Date:   Fri, 11 Oct 2019 08:30:47 +0000
From:   Mihail Atanassov <Mihail.Atanassov@....com>
To:     "james qian wang (Arm Technology China)" <james.qian.wang@....com>
CC:     Liviu Dudau <Liviu.Dudau@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        Brian Starkey <Brian.Starkey@....com>,
        "maarten.lankhorst@...ux.intel.com" 
        <maarten.lankhorst@...ux.intel.com>,
        "sean@...rly.run" <sean@...rly.run>,
        "imirkin@...m.mit.edu" <imirkin@...m.mit.edu>,
        "Jonathan Chai (Arm Technology China)" <Jonathan.Chai@....com>,
        "Julien Yin (Arm Technology China)" <Julien.Yin@....com>,
        "Thomas Sun (Arm Technology China)" <thomas.Sun@....com>,
        "Lowry Li (Arm Technology China)" <Lowry.Li@....com>,
        Ayan Halder <Ayan.Halder@....com>,
        "Tiannan Zhu (Arm Technology China)" <Tiannan.Zhu@....com>,
        "Yiqi Kang (Arm Technology China)" <Yiqi.Kang@....com>,
        nd <nd@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Ben Davis <Ben.Davis@....com>,
        "Oscar Zhang (Arm Technology China)" <Oscar.Zhang@....com>,
        "Channing Chen (Arm Technology China)" <Channing.Chen@....com>
Subject: Re: [PATCH v2 2/4] drm/komeda: Add drm_lut_to_fgamma_coeffs()

On Friday, 11 October 2019 06:45:35 BST james qian wang (Arm Technology China) wrote:
> This function is used to convert drm 3dlut to komeda HW required 1d curve
> coeffs values.
> 
> Signed-off-by: james qian wang (Arm Technology China) <james.qian.wang@....com>
> ---
>  .../arm/display/komeda/komeda_color_mgmt.c    | 52 +++++++++++++++++++
>  .../arm/display/komeda/komeda_color_mgmt.h    |  9 +++-
>  2 files changed, 60 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c b/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c
> index 9d14a92dbb17..c180ce70c26c 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.c
> @@ -65,3 +65,55 @@ const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range)
>  
>  	return coeffs;
>  }
> +
> +struct gamma_curve_sector {
> +	u32 boundary_start;
> +	u32 num_of_segments;
> +	u32 segment_width;
> +};
> +
> +struct gamma_curve_segment {
> +	u32 start;
> +	u32 end;
> +};
> +
> +static struct gamma_curve_sector sector_tbl[] = {
[bikeshed] I'd name this fgamma_sector_tbl (didn't the previous version
of this patch stack have an gamma_curve_sector for igamma?).
> +	{ 0,    4,  4   },
> +	{ 16,   4,  4   },
> +	{ 32,   4,  8   },
> +	{ 64,   4,  16  },
> +	{ 128,  4,  32  },
> +	{ 256,  4,  64  },
> +	{ 512,  16, 32  },
> +	{ 1024, 24, 128 },
> +};
> +
> +static void
> +drm_lut_to_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs,
> +		  struct gamma_curve_sector *sector_tbl, u32 num_sectors)
> +{
> +	struct drm_color_lut *lut;
> +	u32 i, j, in, num = 0;
> +
> +	if (!lut_blob)
> +		return;
> +
> +	lut = lut_blob->data;
> +
> +	for (i = 0; i < num_sectors; i++) {
> +		for (j = 0; j < sector_tbl[i].num_of_segments; j++) {
> +			in = sector_tbl[i].boundary_start +
> +			     j * sector_tbl[i].segment_width;
> +
> +			coeffs[num++] = drm_color_lut_extract(lut[in].red,
> +						KOMEDA_COLOR_PRECISION);
> +		}
> +	}
> +
> +	coeffs[num] = BIT(KOMEDA_COLOR_PRECISION);
> +}
> +
> +void drm_lut_to_fgamma_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs)
> +{
> +	drm_lut_to_coeffs(lut_blob, coeffs, sector_tbl, ARRAY_SIZE(sector_tbl));
> +}
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h b/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h
> index a2df218f58e7..08ab69281648 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_color_mgmt.h
> @@ -11,7 +11,14 @@
>  #include <drm/drm_color_mgmt.h>
>  
>  #define KOMEDA_N_YUV2RGB_COEFFS		12
> +#define KOMEDA_N_RGB2YUV_COEFFS		12
> +#define KOMEDA_COLOR_PRECISION		12
> +#define KOMEDA_N_GAMMA_COEFFS		65
> +#define KOMEDA_COLOR_LUT_SIZE		BIT(KOMEDA_COLOR_PRECISION)
> +#define KOMEDA_N_CTM_COEFFS		9
[nit] The alignment with the group above seems a bit off.
> +
> +void drm_lut_to_fgamma_coeffs(struct drm_property_blob *lut_blob, u32 *coeffs);
>  
>  const s32 *komeda_select_yuv2rgb_coeffs(u32 color_encoding, u32 color_range);
>  
> -#endif
> +#endif /*_KOMEDA_COLOR_MGMT_H_*/
> 
Reviewed-by: Mihail Atanassov <mihail.atanassov@....com>

-- 
Mihail