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>

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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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include/drm/display/drm_dp_helper.h

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