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[RFC,v2,1/6] drm/display/dsc: Add flatness and initial scale value calculations

Message ID 20230329-rfc-msm-dsc-helper-v2-1-3c13ced536b2@quicinc.com
State New
Headers show
Series Introduce MSM-specific DSC helpers | expand

Commit Message

Jessica Zhang March 31, 2023, 6:49 p.m. UTC
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>
---
 include/drm/display/drm_dsc_helper.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

Comments

Dmitry Baryshkov April 1, 2023, 10:01 a.m. UTC | #1
On 31/03/2023 21:49, Jessica Zhang wrote:
> 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>
> ---
>   include/drm/display/drm_dsc_helper.h | 11 +++++++++++
>   1 file changed, 11 insertions(+)

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
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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..f6bc268c1719 100644
--- a/include/drm/display/drm_dsc_helper.h
+++ b/include/drm/display/drm_dsc_helper.h
@@ -17,6 +17,17 @@  enum drm_dsc_params_kind {
 	DRM_DSC_1_2_420,
 };
 
+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);
+}
+
 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,