drm: extract dp link bw helpers

[deliverable/linux.git] / drivers / gpu / drm / drm_dp_helper.c

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 7ecaa11f35f6f29e66dff97da4e2a3629552f10b..3c4cccd0d753a91197deed7dee96ed87c3224b8f 100644 (file)
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -297,3 +297,31 @@ void drm_dp_link_train_channel_eq_delay(u8 dpcd[DP_RECEIVER_CAP_SIZE]) {
                mdelay(dpcd[DP_TRAINING_AUX_RD_INTERVAL] * 4);
 }
 EXPORT_SYMBOL(drm_dp_link_train_channel_eq_delay);
+
+u8 drm_dp_link_rate_to_bw_code(int link_rate)
+{
+       switch (link_rate) {
+       case 162000:
+       default:
+               return DP_LINK_BW_1_62;
+       case 270000:
+               return DP_LINK_BW_2_7;
+       case 540000:
+               return DP_LINK_BW_5_4;
+       }
+}
+EXPORT_SYMBOL(drm_dp_link_rate_to_bw_code);
+
+int drm_dp_bw_code_to_link_rate(u8 link_bw)
+{
+       switch (link_bw) {
+       case DP_LINK_BW_1_62:
+       default:
+               return 162000;
+       case DP_LINK_BW_2_7:
+               return 270000;
+       case DP_LINK_BW_5_4:
+               return 540000;
+       }
+}
+EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate);