diff options
| -rw-r--r-- | drivers/gpu/drm/display/drm_dp_helper.c | 32 | ||||
| -rw-r--r-- | include/drm/display/drm_dp_helper.h | 2 |
2 files changed, 34 insertions, 0 deletions
diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index 32b295003f49..92990a3d577a 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -390,6 +390,38 @@ void drm_dp_link_train_channel_eq_delay(const struct drm_dp_aux *aux, } EXPORT_SYMBOL(drm_dp_link_train_channel_eq_delay); +/** + * drm_dp_phy_name() - Get the name of the given DP PHY + * @dp_phy: The DP PHY identifier + * + * Given the @dp_phy, get a user friendly name of the DP PHY, either "DPRX" or + * "LTTPR <N>", or "<INVALID DP PHY>" on errors. The returned string is always + * non-NULL and valid. + * + * Returns: Name of the DP PHY. + */ +const char *drm_dp_phy_name(enum drm_dp_phy dp_phy) +{ + static const char * const phy_names[] = { + [DP_PHY_DPRX] = "DPRX", + [DP_PHY_LTTPR1] = "LTTPR 1", + [DP_PHY_LTTPR2] = "LTTPR 2", + [DP_PHY_LTTPR3] = "LTTPR 3", + [DP_PHY_LTTPR4] = "LTTPR 4", + [DP_PHY_LTTPR5] = "LTTPR 5", + [DP_PHY_LTTPR6] = "LTTPR 6", + [DP_PHY_LTTPR7] = "LTTPR 7", + [DP_PHY_LTTPR8] = "LTTPR 8", + }; + + if (dp_phy < 0 || dp_phy >= ARRAY_SIZE(phy_names) || + WARN_ON(!phy_names[dp_phy])) + return "<INVALID DP PHY>"; + + return phy_names[dp_phy]; +} +EXPORT_SYMBOL(drm_dp_phy_name); + void drm_dp_lttpr_link_train_clock_recovery_delay(void) { usleep_range(100, 200); diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h index db0fe9f8a612..ab55453f2d2c 100644 --- a/include/drm/display/drm_dp_helper.h +++ b/include/drm/display/drm_dp_helper.h @@ -69,6 +69,8 @@ bool drm_dp_128b132b_link_training_failed(const u8 link_status[DP_LINK_STATUS_SI u8 drm_dp_link_rate_to_bw_code(int link_rate); int drm_dp_bw_code_to_link_rate(u8 link_bw); +const char *drm_dp_phy_name(enum drm_dp_phy dp_phy); + /** * struct drm_dp_vsc_sdp - drm DP VSC SDP * |