diff options
| -rw-r--r-- | drivers/gpu/drm/drm_dp_helper.c | 20 | ||||
| -rw-r--r-- | include/drm/drm_dp_helper.h | 3 |
2 files changed, 23 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 23f9073bc473..81c4aaee422b 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -281,6 +281,26 @@ int drm_dp_read_channel_eq_delay(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIV } EXPORT_SYMBOL(drm_dp_read_channel_eq_delay); +/* Per DP 2.0 Errata */ +int drm_dp_128b132b_read_aux_rd_interval(struct drm_dp_aux *aux) +{ + int unit; + u8 val; + + if (drm_dp_dpcd_readb(aux, DP_128B132B_TRAINING_AUX_RD_INTERVAL, &val) != 1) { + drm_err(aux->drm_dev, "%s: failed rd interval read\n", + aux->name); + /* default to max */ + val = DP_128B132B_TRAINING_AUX_RD_INTERVAL_MASK; + } + + unit = (val & DP_128B132B_TRAINING_AUX_RD_INTERVAL_1MS_UNIT) ? 1 : 2; + val &= DP_128B132B_TRAINING_AUX_RD_INTERVAL_MASK; + + return (val + 1) * unit * 1000; +} +EXPORT_SYMBOL(drm_dp_128b132b_read_aux_rd_interval); + void drm_dp_link_train_clock_recovery_delay(const struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index 30359e434c3f..629ac2272e55 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -1115,6 +1115,7 @@ struct drm_panel; # define DP_UHBR13_5 (1 << 2) #define DP_128B132B_TRAINING_AUX_RD_INTERVAL 0x2216 /* 2.0 */ +# define DP_128B132B_TRAINING_AUX_RD_INTERVAL_1MS_UNIT (1 << 7) # define DP_128B132B_TRAINING_AUX_RD_INTERVAL_MASK 0x7f # define DP_128B132B_TRAINING_AUX_RD_INTERVAL_400_US 0x00 # define DP_128B132B_TRAINING_AUX_RD_INTERVAL_4_MS 0x01 @@ -1552,6 +1553,8 @@ void drm_dp_link_train_channel_eq_delay(const struct drm_dp_aux *aux, void drm_dp_lttpr_link_train_channel_eq_delay(const struct drm_dp_aux *aux, const u8 caps[DP_LTTPR_PHY_CAP_SIZE]); +int drm_dp_128b132b_read_aux_rd_interval(struct drm_dp_aux *aux); + u8 drm_dp_link_rate_to_bw_code(int link_rate); int drm_dp_bw_code_to_link_rate(u8 link_bw); |