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

[Daniel Vetter]

On Mon, Jan 23, 2017 at 11:42:59AM +0200, 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)

Not really clear to me what's going on, but if it helps ...

> Cc: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

> ---
>  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
> -- 
> 2.1.4
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch