diff options
| author | Jessica Zhang <quic_jesszhan@quicinc.com> | 2023-05-24 10:45:14 -0700 |
|---|---|---|
| committer | Dmitry Baryshkov <dmitry.baryshkov@linaro.org> | 2023-06-15 12:58:55 +0300 |
| commit | 7df1ed6ddf3da52b020ef3c3f5597bc628c3e58e (patch) | |
| tree | 9f736a696b3f8c9eff62b6f4064e0f6f803c07a2 /drivers/gpu/drm/display | |
| parent | c72375172194a371935c78b0edaae75cd0c408ea (diff) | |
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 <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/539282/
Link: https://lore.kernel.org/r/20230329-rfc-msm-dsc-helper-v14-1-bafc7be95691@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Diffstat (limited to 'drivers/gpu/drm/display')
| -rw-r--r-- | drivers/gpu/drm/display/drm_dsc_helper.c | 24 |
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); |