}
}
-void drm_dp_vsc_sdp_log(const char *level, struct device *dev,
- const struct drm_dp_vsc_sdp *vsc)
+void drm_dp_vsc_sdp_log(struct drm_printer *p, const struct drm_dp_vsc_sdp *vsc)
{
-#define DP_SDP_LOG(fmt, ...) dev_printk(level, dev, fmt, ##__VA_ARGS__)
- DP_SDP_LOG("DP SDP: %s, revision %u, length %u\n", "VSC",
+ drm_printf(p, "DP SDP: VSC, revision %u, length %u\n",
vsc->revision, vsc->length);
- DP_SDP_LOG(" pixelformat: %s\n",
+ drm_printf(p, " pixelformat: %s\n",
dp_pixelformat_get_name(vsc->pixelformat));
- DP_SDP_LOG(" colorimetry: %s\n",
+ drm_printf(p, " colorimetry: %s\n",
dp_colorimetry_get_name(vsc->pixelformat, vsc->colorimetry));
- DP_SDP_LOG(" bpc: %u\n", vsc->bpc);
- DP_SDP_LOG(" dynamic range: %s\n",
+ drm_printf(p, " bpc: %u\n", vsc->bpc);
+ drm_printf(p, " dynamic range: %s\n",
dp_dynamic_range_get_name(vsc->dynamic_range));
- DP_SDP_LOG(" content type: %s\n",
+ drm_printf(p, " content type: %s\n",
dp_content_type_get_name(vsc->content_type));
-#undef DP_SDP_LOG
}
EXPORT_SYMBOL(drm_dp_vsc_sdp_log);
return 800000;
}
EXPORT_SYMBOL(drm_dp_bw_channel_coding_efficiency);
+
+/**
+ * drm_dp_max_dprx_data_rate - Get the max data bandwidth of a DPRX sink
+ * @max_link_rate: max DPRX link rate in 10kbps units
+ * @max_lanes: max DPRX lane count
+ *
+ * Given a link rate and lanes, get the data bandwidth.
+ *
+ * Data bandwidth is the actual payload rate, which depends on the data
+ * bandwidth efficiency and the link rate.
+ *
+ * Note that protocol layers above the DPRX link level considered here can
+ * further limit the maximum data rate. Such layers are the MST topology (with
+ * limits on the link between the source and first branch device as well as on
+ * the whole MST path until the DPRX link) and (Thunderbolt) DP tunnels -
+ * which in turn can encapsulate an MST link with its own limit - with each
+ * SST or MST encapsulated tunnel sharing the BW of a tunnel group.
+ *
+ * Returns the maximum data rate in kBps units.
+ */
+int drm_dp_max_dprx_data_rate(int max_link_rate, int max_lanes)
+{
+ int ch_coding_efficiency =
+ drm_dp_bw_channel_coding_efficiency(drm_dp_is_uhbr_rate(max_link_rate));
+
+ return DIV_ROUND_DOWN_ULL(mul_u32_u32(max_link_rate * 10 * max_lanes,
+ ch_coding_efficiency),
+ 1000000 * 8);
+}
+EXPORT_SYMBOL(drm_dp_max_dprx_data_rate);