Re: [PATCH 11/11] [v4] drm/i915: Add intel_color_lut_equal() to compare hw and sw gamma lut values

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

On Wed, 17 Apr 2019, Swati Sharma <swati2.sharma@intel.com> wrote:
> v3: Rebase
> v4: -Renamed intel_compare_color_lut() to intel_color_lut_equal() (Jani)
>     -Added the default label above the correct label (Jani)
>     -Corrected smatch warn "variable dereferenced before check" (Dan Carpenter)
>
> Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_color.c   | 50 ++++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_color.h   |  7 +++++
>  drivers/gpu/drm/i915/intel_display.c | 10 ++++++++
>  3 files changed, 67 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
> index 731cb97..592c328 100644
> --- a/drivers/gpu/drm/i915/intel_color.c
> +++ b/drivers/gpu/drm/i915/intel_color.c
> @@ -1495,6 +1495,56 @@ static void ilk_get_color_config(struct intel_crtc_state *crtc_state)
>  		ilk_get_gamma_config(crtc_state);
>  }
>  
> +static inline bool gamma_err_check(struct drm_color_lut *sw_lut, struct drm_color_lut *hw_lut, u32 err)
> +{
> +	 return ((abs((long)hw_lut->red - sw_lut->red)) >= err) ||
> +	        ((abs((long)hw_lut->blue - sw_lut->blue)) >= err) ||
> +	        ((abs((long)hw_lut->green - sw_lut->green)) >= err);
> +}
> +
> +bool intel_color_lut_equal(struct drm_property_blob *blob1,
> +			   struct drm_property_blob *blob2,
> +			   u32 gamma_mode)
> +{
> +	struct drm_color_lut *sw_lut, *hw_lut;
> +	int sw_lut_size, hw_lut_size, i;
> +	u32 bit_precision, err;
> +
> +	if (!blob1 || !blob2)
> +		return false;

(!blob1 && !blob2) must return true, right?

> +
> +	sw_lut = blob1->data;
> +	hw_lut = blob2->data;
> +
> +	switch(gamma_mode) {
> +	default:
> +	case GAMMA_MODE_MODE_8BIT:
> +		bit_precision = 8;
> +		break;
> +	case GAMMA_MODE_MODE_10BIT:
> +		bit_precision = 10;
> +		break;
> +	case GAMMA_MODE_MODE_12BIT:
> +		bit_precision = 12;
> +		break;
> +	}
> +
> +	err = 0xffff >> bit_precision;
> +
> +	sw_lut_size = drm_color_lut_size(blob1);
> +	hw_lut_size = drm_color_lut_size(blob2);
> +
> +	if (sw_lut_size != hw_lut_size)
> +		return false;
> +
> +	for (i = 0; i < sw_lut_size; i++) {
> +		 if (!gamma_err_check(&hw_lut[i], &sw_lut[i], err))
> +			return false;
> +	}
> +
> +	return true;
> +}
> +
>  void intel_color_init(struct intel_crtc *crtc)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> diff --git a/drivers/gpu/drm/i915/intel_color.h b/drivers/gpu/drm/i915/intel_color.h
> index 057e8ac..2ae615e 100644
> --- a/drivers/gpu/drm/i915/intel_color.h
> +++ b/drivers/gpu/drm/i915/intel_color.h
> @@ -6,13 +6,20 @@
>  #ifndef __INTEL_COLOR_H__
>  #define __INTEL_COLOR_H__
>  
> +
> +#include <linux/types.h>
> +
>  struct intel_crtc_state;
>  struct intel_crtc;
> +struct drm_property_blob;
>  
>  void intel_color_init(struct intel_crtc *crtc);
>  int intel_color_check(struct intel_crtc_state *crtc_state);
>  void intel_color_commit(const struct intel_crtc_state *crtc_state);
>  void intel_color_load_luts(const struct intel_crtc_state *crtc_state);
>  void intel_color_get_config(struct intel_crtc_state *crtc_state);
> +bool intel_color_lut_equal(struct drm_property_blob *blob1,
> +			   struct drm_property_blob *blob2,
> +			   u32 gamma_mode);
>  
>  #endif /* __INTEL_COLOR_H__ */
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 0715b4e..bb1ccd7 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -12236,6 +12236,14 @@ static bool fastboot_enabled(struct drm_i915_private *dev_priv)
>  	} \
>  } while (0)
>  
> +#define PIPE_CONF_CHECK_COLOR_LUT(name, gamma_mode) do { \
> +	if (!intel_color_lut_equal(current_config->name, pipe_config->name, gamma_mode)) { \
> +		pipe_config_err(adjust, __stringify(name), \
> +				"hw_state doesn't match sw_state\n"); \
> +		ret = false; \
> +	} \
> +} while (0)
> +
>  #define PIPE_CONF_QUIRK(quirk) \
>  	((current_config->quirks | pipe_config->quirks) & (quirk))
>  
> @@ -12379,6 +12387,8 @@ static bool fastboot_enabled(struct drm_i915_private *dev_priv)
>  	PIPE_CONF_CHECK_INFOFRAME(spd);
>  	PIPE_CONF_CHECK_INFOFRAME(hdmi);
>  
> +	PIPE_CONF_CHECK_COLOR_LUT(base.gamma_lut, pipe_config->gamma_mode);
> +

Hmm, we check gamma_mode and gamma_enable within if (!adjust), I suppose
this should be there too.

>  #undef PIPE_CONF_CHECK_X
>  #undef PIPE_CONF_CHECK_I
>  #undef PIPE_CONF_CHECK_BOOL

Please add

#undef PIPE_CONF_CHECK_COLOR_LUT


-- 
Jani Nikula, Intel Open Source Graphics Center
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