diff options
| author | Damon Ding <damon.ding@rock-chips.com> | 2026-08-28 14:51:50 +0800 |
|---|---|---|
| committer | Luca Ceresoli <luca.ceresoli@bootlin.com> | 2026-09-09 15:36:12 +0200 |
| commit | 6eac4c8bb10302abc0ea0bd1d506c46ec789ce2b (patch) | |
| tree | 921d6415f34912547bf5e836415ae37822cb0628 /include | |
| parent | af9b0fc07000db17656580fd38e5ff27c36c2ab9 (diff) | |
| download | linux-next-6eac4c8bb10302abc0ea0bd1d506c46ec789ce2b.tar.gz linux-next-6eac4c8bb10302abc0ea0bd1d506c46ec789ce2b.zip | |
drm/dp: Add helper to validate DP lane counts
Add a generic helper function drm_dp_lane_count_is_valid() to check
if a DisplayPort lane count is valid. According to the DP specification,
only 1, 2, or 4 lanes are supported.
This helper avoids duplicating DP lane count validation logic across
individual DisplayPort drivers.
Suggested-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Link: https://patch.msgid.link/20260828065153.590802-3-damon.ding@rock-chips.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/drm/display/drm_dp_helper.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h index ab16c1be3900..5b05a7fbe174 100644 --- a/include/drm/display/drm_dp_helper.h +++ b/include/drm/display/drm_dp_helper.h @@ -139,6 +139,12 @@ bool drm_dp_as_sdp_supported(struct drm_dp_aux *aux, const u8 dpcd[DP_RECEIVER_C int drm_dp_psr_setup_time(const u8 psr_cap[EDP_PSR_RECEIVER_CAP_SIZE]); +static inline bool +drm_dp_lane_count_is_valid(int lane_count) +{ + return lane_count == 1 || lane_count == 2 || lane_count == 4; +} + static inline int drm_dp_max_link_rate(const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { |