u8 drm_dp_link_rate_to_bw_code(int link_rate)
{
- switch (link_rate) {
- default:
- WARN(1, "unknown DP link rate %d, using %x\n", link_rate,
- DP_LINK_BW_1_62);
- /* fall through */
- case 162000:
- return DP_LINK_BW_1_62;
- case 270000:
- return DP_LINK_BW_2_7;
- case 540000:
- return DP_LINK_BW_5_4;
- case 810000:
- return DP_LINK_BW_8_1;
- }
+ /* Spec says link_bw = link_rate / 0.27Gbps */
+ return link_rate / 27000;
}
EXPORT_SYMBOL(drm_dp_link_rate_to_bw_code);
int drm_dp_bw_code_to_link_rate(u8 link_bw)
{
- switch (link_bw) {
- default:
- WARN(1, "unknown DP link BW code %x, using 162000\n", link_bw);
- /* fall through */
- case DP_LINK_BW_1_62:
- return 162000;
- case DP_LINK_BW_2_7:
- return 270000;
- case DP_LINK_BW_5_4:
- return 540000;
- case DP_LINK_BW_8_1:
- return 810000;
- }
+ /* Spec says link_rate = link_bw * 0.27Gbps */
+ return link_bw * 27000;
}
EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate);
* @aux: DisplayPort AUX channel
*
* Automatically calls drm_dp_aux_init() if this hasn't been done yet.
+ * This should only be called when the underlying &struct drm_connector is
+ * initialiazed already. Therefore the best place to call this is from
+ * &drm_connector_funcs.late_register. Not that drivers which don't follow this
+ * will Oops when CONFIG_DRM_DP_AUX_CHARDEV is enabled.
+ *
+ * Drivers which need to use the aux channel before that point (e.g. at driver
+ * load time, before drm_dev_register() has been called) need to call
+ * drm_dp_aux_init().
*
* Returns 0 on success or a negative error code on failure.
*/