[PATCH RFC 1/5] drm/display/dsc: Add flatness and initial scale value calculations

[Jessica Zhang]

Add helpers to calculate det_thresh_flatness and initial_scale_value as
these calculations are defined within the DSC spec.

Signed-off-by: Jessica Zhang <quic_jesszhan at quicinc.com>
---
 include/drm/display/drm_dsc_helper.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/drm/display/drm_dsc_helper.h b/include/drm/display/drm_dsc_helper.h
index 4448c482b092..63175650a45e 100644
--- a/include/drm/display/drm_dsc_helper.h
+++ b/include/drm/display/drm_dsc_helper.h
@@ -17,6 +17,16 @@ enum drm_dsc_params_kind {
 	DRM_DSC_1_2_420,
 };
 
+static inline int drm_dsc_calculate_initial_scale_value(struct drm_dsc_config *dsc)
+{
+	return 8 * dsc->rc_model_size / (dsc->rc_model_size - dsc->initial_offset);
+}
+
+static inline int drm_dsc_calculate_det_thresh_flatness(struct drm_dsc_config *dsc)
+{
+	return 2 << (dsc->bits_per_component - 8);
+}
+
 void drm_dsc_dp_pps_header_init(struct dp_sdp_header *pps_header);
 int drm_dsc_dp_rc_buffer_size(u8 rc_buffer_block_size, u8 rc_buffer_size);
 void drm_dsc_pps_payload_pack(struct drm_dsc_picture_parameter_set *pps_sdp,

-- 
2.39.2