Re: [RFC v4 7/8] drm/i915: Implement Plane Gamma for Bdw and Gen9 platforms

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Hi Uma,

On Fri, Aug 17, 2018 at 07:48:50PM +0530, Uma Shankar wrote:
> Implement Plane Gamma feature for BDW and Gen9 platforms.
> 
> v2: Used newly added drm_color_lut_ext structure for enhanced
> precision for Gamma LUT entries.
> 
> v3: Rebase
> 
> Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/i915_pci.c      |  5 +++-
>  drivers/gpu/drm/i915/i915_reg.h      | 25 ++++++++++++++++
>  drivers/gpu/drm/i915/intel_color.c   | 58 ++++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_display.c |  4 +++
>  drivers/gpu/drm/i915/intel_sprite.c  |  4 +++
>  5 files changed, 95 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
> index e931b48..40de78c 100644
> --- a/drivers/gpu/drm/i915/i915_pci.c
> +++ b/drivers/gpu/drm/i915/i915_pci.c
> @@ -54,7 +54,10 @@
>  	.cursor_offsets = { CURSOR_A_OFFSET, IVB_CURSOR_B_OFFSET, IVB_CURSOR_C_OFFSET }
>  
>  #define BDW_COLORS \
> -	.color = { .degamma_lut_size = 512, .gamma_lut_size = 512 }
> +	.color = { .degamma_lut_size = 512, .gamma_lut_size = 512 }, \
> +	.plane_color = { .plane_degamma_lut_size = 0, \
> +			 .plane_gamma_lut_size = 16 }
> +
>  #define CHV_COLORS \
>  	.color = { .degamma_lut_size = 65, .gamma_lut_size = 257 }
>  #define GLK_COLORS \
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 0c9f03d..2db6a84 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -172,6 +172,10 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
>  #define _PHY3(phy, ...) _PICK(phy, __VA_ARGS__)
>  #define _MMIO_PHY3(phy, a, b, c) _MMIO(_PHY3(phy, a, b, c))
>  
> +/* Plane Gamma Registers */
> +#define _MMIO_PLANE_GAMC(plane, i, a, b)  _MMIO(_PIPE(plane, a, b) + (i) * 4)
> +#define _MMIO_PLANE_GAMC16(plane, i, a, b)  _MMIO(_PIPE(plane, a, b) + (i) * 4)
> +
>  #define __MASKED_FIELD(mask, value) ((mask) << 16 | (value))
>  #define _MASKED_FIELD(mask, value) ({					   \
>  	if (__builtin_constant_p(mask))					   \
> @@ -9713,6 +9717,27 @@ enum skl_power_gate {
>  #define PRE_CSC_GAMC_INDEX(pipe)	_MMIO_PIPE(pipe, _PRE_CSC_GAMC_INDEX_A, _PRE_CSC_GAMC_INDEX_B)
>  #define PRE_CSC_GAMC_DATA(pipe)		_MMIO_PIPE(pipe, _PRE_CSC_GAMC_DATA_A, _PRE_CSC_GAMC_DATA_B)
>  
> +/* Plane Gamma in Gen9+ */
> +#define _PLANE_GAMC_1_A	0x701d0
> +#define _PLANE_GAMC_1_B	0x711d0
> +#define _PLANE_GAMC_2_A	0x702d0
> +#define _PLANE_GAMC_2_B	0x712d0
> +#define _PLANE_GAMC_1(pipe)	_PIPE(pipe, _PLANE_GAMC_1_A, _PLANE_GAMC_1_B)
> +#define _PLANE_GAMC_2(pipe)	_PIPE(pipe, _PLANE_GAMC_2_A, _PLANE_GAMC_2_B)
> +#define PLANE_GAMC(pipe, plane, i)	\
> +	_MMIO_PLANE_GAMC(plane, i, _PLANE_GAMC_1(pipe), _PLANE_GAMC_2(pipe))
> +
> +#define _PLANE_GAMC16_1_A	0x70210
> +#define _PLANE_GAMC16_1_B	0x71210
> +#define _PLANE_GAMC16_2_A	0x70310
> +#define _PLANE_GAMC16_2_B	0x71310
> +#define _PLANE_GAMC16_1(pipe)	_PIPE(pipe, _PLANE_GAMC16_1_A, \
> +				     _PLANE_GAMC16_1_B)
> +#define _PLANE_GAMC16_2(pipe)	_PIPE(pipe, _PLANE_GAMC16_2_A, \
> +				     _PLANE_GAMC16_2_B)
> +#define PLANE_GAMC16(pipe, plane, i) _MMIO_PLANE_GAMC16(plane, i, \
> +				_PLANE_GAMC16_1(pipe), _PLANE_GAMC16_2(pipe))
> +
>  /* pipe CSC & degamma/gamma LUTs on CHV */
>  #define _CGM_PIPE_A_CSC_COEFF01	(VLV_DISPLAY_BASE + 0x67900)
>  #define _CGM_PIPE_A_CSC_COEFF23	(VLV_DISPLAY_BASE + 0x67904)
> diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
> index fb8402f..2b5c0cd 100644
> --- a/drivers/gpu/drm/i915/intel_color.c
> +++ b/drivers/gpu/drm/i915/intel_color.c
> @@ -492,6 +492,59 @@ static void broadwell_load_luts(struct drm_crtc_state *state)
>  	I915_WRITE(PREC_PAL_INDEX(pipe), 0);
>  }
>  
> +static void bdw_load_plane_gamma_lut(const struct drm_plane_state *state,
> +				     u32 offset)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(state->plane->dev);
> +	enum pipe pipe = to_intel_plane(state->plane)->pipe;
> +	enum plane_id plane = to_intel_plane(state->plane)->id;
> +	uint32_t i, lut_size =
> +			INTEL_INFO(dev_priv)->plane_color.plane_gamma_lut_size;
> +
> +	if (state->gamma_lut) {
> +		struct drm_color_lut_ext *lut =
> +			(struct drm_color_lut_ext *) state->gamma_lut->data;
> +
> +		for (i = 0; i < lut_size; i++) {
> +			uint32_t word =
> +			(drm_color_lut_extract(lut[i].red, 10) << 20) |
> +			(drm_color_lut_extract(lut[i].green, 10) << 10) |
> +			drm_color_lut_extract(lut[i].blue, 10);


Shouldn't you be using drm_color_lut_extract_ext ?


> +
> +			I915_WRITE(PLANE_GAMC(pipe, plane, i), word);
> +		}
> +
> +		/* Program the max register to clamp values > 1.0. */
> +		i = lut_size - 1;
> +		I915_WRITE(PLANE_GAMC16(pipe, plane, 0),
> +			   drm_color_lut_extract(lut[i].red, 16));
> +		I915_WRITE(PLANE_GAMC16(pipe, plane, 1),
> +			   drm_color_lut_extract(lut[i].green, 16));
> +		I915_WRITE(PLANE_GAMC16(pipe, plane, 2),
> +			   drm_color_lut_extract(lut[i].blue, 16));
> +	} else {
> +		for (i = 0; i < lut_size; i++) {
> +			uint32_t v = (i * ((1 << 10) - 1)) / (lut_size - 1);
> +
> +			I915_WRITE(PLANE_GAMC(pipe, plane, i),
> +				   (v << 20) | (v << 10) | v);
> +		}
> +
> +		I915_WRITE(PLANE_GAMC16(pipe, plane, 0), (1 << 16) - 1);
> +		I915_WRITE(PLANE_GAMC16(pipe, plane, 1), (1 << 16) - 1);
> +		I915_WRITE(PLANE_GAMC16(pipe, plane, 2), (1 << 16) - 1);
> +	}
> +}
> +
> +/* Loads the palette/gamma unit for the CRTC on Broadwell+. */
> +static void broadwell_load_plane_luts(const struct drm_plane_state *state)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(state->plane->dev);
> +
> +	bdw_load_plane_gamma_lut(state,
> +		INTEL_INFO(dev_priv)->plane_color.plane_degamma_lut_size);
> +}
> +
>  static void glk_load_degamma_lut(struct drm_crtc_state *state)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(state->crtc->dev);
> @@ -648,6 +701,11 @@ void intel_plane_color_init(struct drm_plane *plane)
>  
>  	drm_plane_color_create_prop(plane->dev, plane);
>  
> +	if (IS_BROADWELL(dev_priv) || IS_GEN9_BC(dev_priv) ||
> +		IS_BROXTON(dev_priv)) {
> +		dev_priv->display.load_plane_luts = broadwell_load_plane_luts;
> +	}
> +
>  	/* Enable color management support when we have degamma & gamma LUTs. */
>  	if (INTEL_INFO(dev_priv)->plane_color.plane_degamma_lut_size != 0 &&
>  	    INTEL_INFO(dev_priv)->plane_color.plane_gamma_lut_size != 0)
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 690e1e8..2d15ac2 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -13803,6 +13803,10 @@ bool skl_plane_has_planar(struct drm_i915_private *dev_priv,
>  						  DRM_COLOR_YCBCR_BT709,
>  						  DRM_COLOR_YCBCR_LIMITED_RANGE);
>  
> +	/* Add Plane Color properties */
> +	if (IS_BROADWELL(dev_priv) || INTEL_GEN(dev_priv) >= 9)
> +		intel_plane_color_init(&primary->base);
> +
>  	drm_plane_helper_add(&primary->base, &intel_plane_helper_funcs);
>  
>  	return primary;
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
> index f7026e8..0eeb1d3 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -1650,6 +1650,10 @@ struct intel_plane *
>  					  DRM_COLOR_YCBCR_BT709,
>  					  DRM_COLOR_YCBCR_LIMITED_RANGE);
>  
> +	/* Add Plane Color properties */
> +	if (IS_BROADWELL(dev_priv) || INTEL_GEN(dev_priv) >= 9)
> +		intel_plane_color_init(&intel_plane->base);
> +
>  	drm_plane_helper_add(&intel_plane->base, &intel_plane_helper_funcs);
>  
>  	return intel_plane;
> -- 
> 1.9.1
> 
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> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Cheers,
Alex G
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