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@xxxxxxxxx>
Cc: Harry Wentland <hwentlan@xxxxxxx>
Cc: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Cc: Vandita Kulkarni <vandita.kulkarni@xxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
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);
--
2.20.1
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