Re: [PATCH v12 3/9] drm/display/dsc: Add drm_dsc_get_bpp_int helper

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

On Wed, 17 May 2023, Jessica Zhang <quic_jesszhan@quicinc.com> wrote:
> Add helper to get the integer value of drm_dsc_config.bits_per_pixel
>
> Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
> Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
> ---
>  include/drm/display/drm_dsc_helper.h | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/include/drm/display/drm_dsc_helper.h b/include/drm/display/drm_dsc_helper.h
> index e0cbc38ada26..7bf7e8ff8eb4 100644
> --- a/include/drm/display/drm_dsc_helper.h
> +++ b/include/drm/display/drm_dsc_helper.h
> @@ -9,6 +9,7 @@
>  #define DRM_DSC_HELPER_H_
>  
>  #include <drm/display/drm_dsc.h>
> +#include <linux/bug.h>

Seems like a small thing, adding static inlines in headers usually leads
to more header dependencies like this, and gradually slows down build.

Does it need to be a static inline?

BR,
Jani.

>  
>  enum drm_dsc_params_type {
>  	DRM_DSC_1_2_444,
> @@ -26,6 +27,12 @@ void drm_dsc_set_rc_buf_thresh(struct drm_dsc_config *vdsc_cfg);
>  int drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg, enum drm_dsc_params_type type);
>  int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg);
>  
> +static inline u32 drm_dsc_get_bpp_int(const struct drm_dsc_config *dsc)
> +{
> +	WARN_ON_ONCE(dsc->bits_per_pixel & 0xf);
> +	return dsc->bits_per_pixel >> 4;
> +}
> +
>  static inline u8 drm_dsc_initial_scale_value(const struct drm_dsc_config *dsc)
>  {
>  	return 8 * dsc->rc_model_size / (dsc->rc_model_size - dsc->initial_offset);

-- 
Jani Nikula, Intel Open Source Graphics Center