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[v4,10/12] drm/display/dsc: Add flatness and initial scale value calculations

Message ID 20230403092313.235320-11-dmitry.baryshkov@linaro.org
State New
Headers show
Series drm/i915: move DSC RC tables to drm_dsc_helper.c | expand

Commit Message

Dmitry Baryshkov April 3, 2023, 9:23 a.m. UTC 
From: Jessica Zhang <quic_jesszhan@quicinc.com>

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

Changes in v2:
- Renamed det_thresh_flatness to flatness_det_thresh
- Set initial_scale_value directly in helper

Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 include/drm/display/drm_dsc_helper.h | 11 +++++++++++
 1 file changed, 11 insertions(+)
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Patch

diff --git a/include/drm/display/drm_dsc_helper.h b/include/drm/display/drm_dsc_helper.h
index 4448c482b092..bfa7f3acafcb 100644
--- a/include/drm/display/drm_dsc_helper.h
+++ b/include/drm/display/drm_dsc_helper.h
@@ -26,5 +26,16 @@  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_kind kind);
 int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg);
 
+static inline void drm_dsc_set_initial_scale_value(struct drm_dsc_config *dsc)
+{
+	dsc->initial_scale_value = 8 * dsc->rc_model_size /
+		(dsc->rc_model_size - dsc->initial_offset);
+}
+
+static inline int drm_dsc_calculate_flatness_det_thresh(struct drm_dsc_config *dsc)
+{
+	return 2 << (dsc->bits_per_component - 8);
+}
+
 #endif /* _DRM_DSC_HELPER_H_ */