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drm/bridge: add drm_for_each_bridge_in_chain_from()

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Add variant of drm_for_each_bridge_in_chain_scoped() that iterates on the
encoder bridge from a given bridge until the end of the chain.

Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/20250808-drm-bridge-alloc-getput-for_each_bridge-v2-8-edb6ee81edf1@bootlin.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
This commit is contained in:
Luca Ceresoli
2025-08-08 16:49:15 +02:00
parent 2f08387a44
commit 78f4eec620
1 changed files with 19 additions and 0 deletions
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19
include/drm/drm_bridge.h
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@@ -1471,6 +1471,25 @@ drm_bridge_get_next_bridge_and_put(struct drm_bridge *bridge)
bridge; \
bridge = drm_bridge_get_next_bridge_and_put(bridge))
/**
* drm_for_each_bridge_in_chain_from - iterate over all bridges starting
* from the given bridge
* @first_bridge: the bridge to start from
* @bridge: a bridge pointer updated to point to the current bridge at each
* iteration
*
* Iterate over all bridges in the encoder chain starting from
* @first_bridge, included.
*
* Automatically gets/puts the bridge reference while iterating, and puts
* the reference even if returning or breaking in the middle of the loop.
*/
#define drm_for_each_bridge_in_chain_from(first_bridge, bridge) \
for (struct drm_bridge *bridge __free(drm_bridge_put) = \
drm_bridge_get(first_bridge); \
bridge; \
bridge = drm_bridge_get_next_bridge_and_put(bridge))
enum drm_mode_status
drm_bridge_chain_mode_valid(struct drm_bridge *bridge,
const struct drm_display_info *info,