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drm/dp: Add helper to validate DP lane counts

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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>
This commit is contained in:
Damon Ding 2026-08-28 14:51:50 +08:00 committed by Luca Ceresoli
parent af9b0fc070
commit 6eac4c8bb1
1 changed files with 6 additions and 0 deletions
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6
include/drm/display/drm_dp_helper.h
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@ -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])
{