drm/display/dsc: Add flatness and initial scale value calculations

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

Reviewed-by: Marijn Suijten <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Signed-off-by: Jessica Zhang <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/539282/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/gpu/drm/display/drm_dsc_helper.c b/drivers/gpu/drm/display/drm_dsc_helper.c
index fc187a8d8873..4efb6236d22c 100644
--- a/drivers/gpu/drm/display/drm_dsc_helper.c
+++ b/drivers/gpu/drm/display/drm_dsc_helper.c
@@ -1413,3 +1413,27 @@ int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg)
 	return 0;
 }
 EXPORT_SYMBOL(drm_dsc_compute_rc_parameters);
+
+/**
+ * drm_dsc_initial_scale_value() - Calculate the initial scale value for the given DSC config
+ * @dsc: Pointer to DRM DSC config struct
+ *
+ * Return: Calculated initial scale value
+ */
+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);
+}
+EXPORT_SYMBOL(drm_dsc_initial_scale_value);
+
+/**
+ * drm_dsc_flatness_det_thresh() - Calculate the flatness_det_thresh for the given DSC config
+ * @dsc: Pointer to DRM DSC config struct
+ *
+ * Return: Calculated flatness det thresh value
+ */
+u32 drm_dsc_flatness_det_thresh(const struct drm_dsc_config *dsc)
+{
+	return 2 << (dsc->bits_per_component - 8);
+}
+EXPORT_SYMBOL(drm_dsc_flatness_det_thresh);