Re: [v9][PATCH 01/11] drm/i915/display: Add func to get gamma bit precision

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

On Fri, 30 Aug 2019, Jani Nikula <jani.nikula@intel.com> wrote:
> On Fri, 30 Aug 2019, Swati Sharma <swati2.sharma@intel.com> wrote:
>> Each platform supports different gamma modes and each gamma mode
>> has different bit precision. Here bit precision corresponds
>> to number of bits the hw LUT supports.
>>
>> Add func per platform to return bit precision corresponding to gamma mode
>> which will be later used as a parameter in lut comparison function
>> intel_color_lut_equal().
>>
>> This is done for legacy, i965, ilk, glk, icl and their variant platforms.
>>
>> v6: -Added func intel_color_get_bit_precision() to get bit precision for
>>      gamma and degamma lut readout depending upon platform and
>>      corresponding to load_luts() [Ankit]
>>     -Made patch11 as patch3 [Jani]
>> v7: -Renamed func intel_color_get_bit_precision() to
>>      intel_color_get_gamma_bit_precision()
>>     -Added separate function/platform for gamma bit precision [Ville]
>>     -Corrected checkpatch warnings
>> v8: -Split patch 3 into 4 separate patches
>> v9: -Changed commit message, gave more info [Uma]
>>     -Added precision func for icl+ platform
>>
>> Signed-off-by: Swati Sharma <swati2.sharma@intel.com>

Reviewed-by: Jani Nikula <jani.nikula@intel.com>

>> ---
>>  drivers/gpu/drm/i915/display/intel_color.c | 99 ++++++++++++++++++++++++++++++
>>  drivers/gpu/drm/i915/display/intel_color.h |  1 +
>>  2 files changed, 100 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
>> index 71a0201..dcc65d7 100644
>> --- a/drivers/gpu/drm/i915/display/intel_color.c
>> +++ b/drivers/gpu/drm/i915/display/intel_color.c
>> @@ -1371,6 +1371,105 @@ static int icl_color_check(struct intel_crtc_state *crtc_state)
>>  	return 0;
>>  }
>>  
>> +static int i9xx_gamma_precision(const struct intel_crtc_state *crtc_state)
>> +{
>> +	if (!crtc_state->gamma_enable)
>> +		return 0;
>> +
>> +	switch (crtc_state->gamma_mode) {
>> +	case GAMMA_MODE_MODE_8BIT:
>> +		return 8;
>> +	case GAMMA_MODE_MODE_10BIT:
>> +		return 16;
>> +	default:
>> +		MISSING_CASE(crtc_state->gamma_mode);
>> +		return 0;
>> +	}
>> +}
>> +
>> +static int ilk_gamma_precision(const struct intel_crtc_state *crtc_state)
>> +{
>> +	if (!crtc_state->gamma_enable)
>> +		return 0;
>> +
>> +	if ((crtc_state->csc_mode & CSC_POSITION_BEFORE_GAMMA) == 0)
>> +		return 0;
>> +
>> +	switch (crtc_state->gamma_mode) {
>> +	case GAMMA_MODE_MODE_8BIT:
>> +		return 8;
>> +	case GAMMA_MODE_MODE_10BIT:
>> +		return 10;
>> +	default:
>> +		MISSING_CASE(crtc_state->gamma_mode);
>> +		return 0;
>> +	}
>> +}
>> +
>> +static int chv_gamma_precision(const struct intel_crtc_state *crtc_state)
>> +{
>> +	if (crtc_state->cgm_mode & CGM_PIPE_MODE_GAMMA)
>> +		return 10;
>> +	else
>> +		return i9xx_gamma_precision(crtc_state);
>
> Why does one branch check for ->gamma_enable and the other not? See below.
>
>> +}
>> +
>> +static int glk_gamma_precision(const struct intel_crtc_state *crtc_state)
>> +{
>> +	if (!crtc_state->gamma_enable)
>> +		return 0;
>> +
>> +	switch (crtc_state->gamma_mode) {
>> +	case GAMMA_MODE_MODE_8BIT:
>> +		return 8;
>> +	case GAMMA_MODE_MODE_10BIT:
>> +		return 10;
>> +	default:
>> +		MISSING_CASE(crtc_state->gamma_mode);
>> +		return 0;
>> +	}
>> +}
>> +
>> +static int icl_gamma_precision(const struct intel_crtc_state *crtc_state)
>> +{
>
> Why does this function not check for ->gamma_enable but the others do?
> See below.
>
>> +	if ((crtc_state->gamma_mode & POST_CSC_GAMMA_ENABLE) == 0)
>> +		return 0;
>> +
>> +	switch (crtc_state->gamma_mode & GAMMA_MODE_MODE_MASK) {
>> +	case GAMMA_MODE_MODE_8BIT:
>> +		return 8;
>> +	case GAMMA_MODE_MODE_10BIT:
>> +		return 10;
>> +	case GAMMA_MODE_MODE_12BIT_MULTI_SEGMENTED:
>> +		return 16;
>> +	default:
>> +		MISSING_CASE(crtc_state->gamma_mode);
>> +		return 0;
>> +	}
>> +}
>> +
>> +int intel_color_get_gamma_bit_precision(const struct intel_crtc_state *crtc_state)
>> +{
>> +	struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
>> +	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
>> +
>
> Should the ->gamma_enable check be here once, instead?
>
> With that fixed,
>
> Reviewed-by: Jani Nikula <jani.nikula@intel.com>
>
>
> BR,
> Jani.
>
>
>> +	if (HAS_GMCH(dev_priv)) {
>> +		if (IS_CHERRYVIEW(dev_priv))
>> +			return chv_gamma_precision(crtc_state);
>> +		else
>> +			return i9xx_gamma_precision(crtc_state);
>> +	} else {
>> +		if (INTEL_GEN(dev_priv) >= 11)
>> +			return icl_gamma_precision(crtc_state);
>> +		else if (IS_CANNONLAKE(dev_priv) || IS_GEMINILAKE(dev_priv))
>> +			return glk_gamma_precision(crtc_state);
>> +		else if (IS_IRONLAKE(dev_priv))
>> +			return ilk_gamma_precision(crtc_state);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>>  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/display/intel_color.h b/drivers/gpu/drm/i915/display/intel_color.h
>> index 057e8ac..0226d3a 100644
>> --- a/drivers/gpu/drm/i915/display/intel_color.h
>> +++ b/drivers/gpu/drm/i915/display/intel_color.h
>> @@ -14,5 +14,6 @@
>>  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);
>> +int intel_color_get_gamma_bit_precision(const struct intel_crtc_state *crtc_state);
>>  
>>  #endif /* __INTEL_COLOR_H__ */

-- 
Jani Nikula, Intel Open Source Graphics Center
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