Re: [PATCH] drm/color: un-inline drm_color_lut_extract()

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

On Fri, 27 Jan 2017, Jani Nikula <jani.nikula@intel.com> wrote:
> On Fri, 27 Jan 2017, Lionel Landwerlin <lionel.g.landwerlin@intel.com> wrote:
>> Hi Jani,
>>
>> Looks good to me :
>>
>> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
>
> Thanks for the reviews, pushed... to drm-intel-next-queued instead of
> drm-misc-next. /o\
>
> Dave, Daniel, please advise, shall I revert or shall we let this flow in
> via drm-intel?
>
> Sorry for the mess.

Reverted, there was a conflict in the docs updates as well so this is
easier. I'll post a rebase version of the patch.

BR,
Jani.


>
> BR,
> Jani.
>
>
>
>>
>> On 23/01/17 09:42, Jani Nikula wrote:
>>> The function is not that big, but it's also not used for anything
>>> performance critical. Make it a normal function.
>>>
>>> As a side effect, this apparently makes sparse smarter about what it's
>>> doing, and gets rid of the warning:
>>>
>>> ./include/drm/drm_color_mgmt.h:53:28: warning: shift too big (4294967295) for type unsigned long
>>> ./include/drm/drm_color_mgmt.h:53:28: warning: cast truncates bits from constant value (8000000000000000 becomes 0)
>>>
>>> Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
>>> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
>>> ---
>>>   drivers/gpu/drm/drm_color_mgmt.c | 24 ++++++++++++++++++++++++
>>>   include/drm/drm_color_mgmt.h     | 27 ++-------------------------
>>>   2 files changed, 26 insertions(+), 25 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
>>> index 789b4c65cd69..5618f60c7690 100644
>>> --- a/drivers/gpu/drm/drm_color_mgmt.c
>>> +++ b/drivers/gpu/drm/drm_color_mgmt.c
>>> @@ -88,6 +88,30 @@
>>>    */
>>>   
>>>   /**
>>> + * drm_color_lut_extract - clamp&round LUT entries
>>> + * @user_input: input value
>>> + * @bit_precision: number of bits the hw LUT supports
>>> + *
>>> + * Extract a degamma/gamma LUT value provided by user (in the form of
>>> + * &drm_color_lut entries) and round it to the precision supported by the
>>> + * hardware.
>>> + */
>>> +uint32_t drm_color_lut_extract(uint32_t user_input, uint32_t bit_precision)
>>> +{
>>> +	uint32_t val = user_input;
>>> +	uint32_t max = 0xffff >> (16 - bit_precision);
>>> +
>>> +	/* Round only if we're not using full precision. */
>>> +	if (bit_precision < 16) {
>>> +		val += 1UL << (16 - bit_precision - 1);
>>> +		val >>= 16 - bit_precision;
>>> +	}
>>> +
>>> +	return clamp_val(val, 0, max);
>>> +}
>>> +EXPORT_SYMBOL(drm_color_lut_extract);
>>> +
>>> +/**
>>>    * drm_crtc_enable_color_mgmt - enable color management properties
>>>    * @crtc: DRM CRTC
>>>    * @degamma_lut_size: the size of the degamma lut (before CSC)
>>> diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
>>> index c767238ac9d5..bce4a532836d 100644
>>> --- a/include/drm/drm_color_mgmt.h
>>> +++ b/include/drm/drm_color_mgmt.h
>>> @@ -25,6 +25,8 @@
>>>   
>>>   #include <linux/ctype.h>
>>>   
>>> +uint32_t drm_color_lut_extract(uint32_t user_input, uint32_t bit_precision);
>>> +
>>>   void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
>>>   				uint degamma_lut_size,
>>>   				bool has_ctm,
>>> @@ -33,29 +35,4 @@ void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
>>>   int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
>>>   				 int gamma_size);
>>>   
>>> -/**
>>> - * drm_color_lut_extract - clamp&round LUT entries
>>> - * @user_input: input value
>>> - * @bit_precision: number of bits the hw LUT supports
>>> - *
>>> - * Extract a degamma/gamma LUT value provided by user (in the form of
>>> - * &drm_color_lut entries) and round it to the precision supported by the
>>> - * hardware.
>>> - */
>>> -static inline uint32_t drm_color_lut_extract(uint32_t user_input,
>>> -					     uint32_t bit_precision)
>>> -{
>>> -	uint32_t val = user_input;
>>> -	uint32_t max = 0xffff >> (16 - bit_precision);
>>> -
>>> -	/* Round only if we're not using full precision. */
>>> -	if (bit_precision < 16) {
>>> -		val += 1UL << (16 - bit_precision - 1);
>>> -		val >>= 16 - bit_precision;
>>> -	}
>>> -
>>> -	return clamp_val(val, 0, max);
>>> -}
>>> -
>>> -
>>>   #endif
>>
>>

-- 
Jani Nikula, Intel Open Source Technology Center
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