diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2025-07-18 15:01:52 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2025-09-19 23:24:37 +0300 |
| commit | 3a9cf301794c1a49d95eeb13119ff490fb5cfe88 (patch) | |
| tree | fa1e5fd5f349013aae7f5c0cd26ceb68197c2d5f /include | |
| parent | 2b8e4b94c1b6cea1b4d3f989b3dfe4301d0d3a4a (diff) | |
| download | linux-3a9cf301794c1a49d95eeb13119ff490fb5cfe88.tar.xz | |
drm/dp: Add POST_LT_ADJ_REQ helpers
Add small helpers (drm_dp_post_lt_adj_req_supported() and
drm_dp_post_lt_adj_req_in_progress()) to help with implementing
the POST_LT_ADJ_REQ sequence.
Tested-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250718120154.15492-3-ville.syrjala@linux.intel.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/drm/display/drm_dp_helper.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h index 87caa4f1fdb8..52ce28097015 100644 --- a/include/drm/display/drm_dp_helper.h +++ b/include/drm/display/drm_dp_helper.h @@ -37,6 +37,7 @@ bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE], int lane_count); bool drm_dp_clock_recovery_ok(const u8 link_status[DP_LINK_STATUS_SIZE], int lane_count); +bool drm_dp_post_lt_adj_req_in_progress(const u8 link_status[DP_LINK_STATUS_SIZE]); u8 drm_dp_get_adjust_request_voltage(const u8 link_status[DP_LINK_STATUS_SIZE], int lane); u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SIZE], @@ -156,6 +157,13 @@ drm_dp_enhanced_frame_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) } static inline bool +drm_dp_post_lt_adj_req_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) +{ + return dpcd[DP_DPCD_REV] >= 0x13 && + (dpcd[DP_MAX_LANE_COUNT] & DP_POST_LT_ADJ_REQ_SUPPORTED); +} + +static inline bool drm_dp_fast_training_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { return dpcd[DP_DPCD_REV] >= 0x11 && |