drm/display/dsc: Add drm_dsc_get_bpp_int helper

Add helper to get the integer value of drm_dsc_config.bits_per_pixel
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/539268/
Link: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v14-3-bafc7be95691@quicinc.comSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/display/drm_dsc_helper.c

@@ -1436,6 +1436,19 @@ int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg)
 }
 EXPORT_SYMBOL(drm_dsc_compute_rc_parameters);
 
+/**
+ * drm_dsc_get_bpp_int() - Get integer bits per pixel value for the given DRM DSC config
+ * @vdsc_cfg: Pointer to DRM DSC config struct
+ *
+ * Return: Integer BPP value
+ */
+u32 drm_dsc_get_bpp_int(const struct drm_dsc_config *vdsc_cfg)
+{
+	WARN_ON_ONCE(vdsc_cfg->bits_per_pixel & 0xf);
+	return vdsc_cfg->bits_per_pixel >> 4;
+}
+EXPORT_SYMBOL(drm_dsc_get_bpp_int);
+
 /**
  * drm_dsc_initial_scale_value() - Calculate the initial scale value for the given DSC config
  * @dsc: Pointer to DRM DSC config struct

include/drm/display/drm_dsc_helper.h

@@ -27,6 +27,7 @@ int drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg, enum drm_dsc_params
 int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg);
 u8 drm_dsc_initial_scale_value(const struct drm_dsc_config *dsc);
 u32 drm_dsc_flatness_det_thresh(const struct drm_dsc_config *dsc);
+u32 drm_dsc_get_bpp_int(const struct drm_dsc_config *vdsc_cfg);
 
 #endif /* _DRM_DSC_HELPER_H_ */