Add a helper for calculating the rc buffer size from the DCPD offsets DP_DSC_RC_BUF_BLK_SIZE and DP_DSC_RC_BUF_SIZE.
Cc: Alex Deucher alexdeucher@gmail.com Cc: Harry Wentland hwentlan@amd.com Cc: Manasi Navare manasi.d.navare@intel.com Signed-off-by: Jani Nikula jani.nikula@intel.com --- drivers/gpu/drm/drm_dsc.c | 27 +++++++++++++++++++++++++++ include/drm/drm_dsc.h | 1 + 2 files changed, 28 insertions(+)
diff --git a/drivers/gpu/drm/drm_dsc.c b/drivers/gpu/drm/drm_dsc.c index 09afbc01ea94..ff602f7ec65b 100644 --- a/drivers/gpu/drm/drm_dsc.c +++ b/drivers/gpu/drm/drm_dsc.c @@ -49,6 +49,33 @@ void drm_dsc_dp_pps_header_init(struct dp_sdp_header *pps_header) } EXPORT_SYMBOL(drm_dsc_dp_pps_header_init);
+/** + * drm_dsc_dp_rc_buffer_size - get rc buffer size in bytes + * @rc_buffer_block_size: block size code, according to DPCD offset 62h + * @rc_buffer_size: number of blocks - 1, according to DPCD offset 63h + * + * return: + * buffer size in bytes, or 0 on invalid input + */ +int drm_dsc_dp_rc_buffer_size(u8 rc_buffer_block_size, u8 rc_buffer_size) +{ + int size = 1024 * (rc_buffer_size + 1); + + switch (rc_buffer_block_size) { + case DP_DSC_RC_BUF_BLK_SIZE_1: + return 1 * size; + case DP_DSC_RC_BUF_BLK_SIZE_4: + return 4 * size; + case DP_DSC_RC_BUF_BLK_SIZE_16: + return 16 * size; + case DP_DSC_RC_BUF_BLK_SIZE_64: + return 64 * size; + default: + return 0; + } +} +EXPORT_SYMBOL(drm_dsc_dp_rc_buffer_size); + /** * drm_dsc_pps_payload_pack() - Populates the DSC PPS * diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h index 887954cbfc60..537a68330840 100644 --- a/include/drm/drm_dsc.h +++ b/include/drm/drm_dsc.h @@ -602,6 +602,7 @@ struct drm_dsc_pps_infoframe { } __packed;
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, const struct drm_dsc_config *dsc_cfg); int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg);