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drm/bridge: add devm_drm_bridge_alloc()

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Add a macro to allocate and initialize a DRM bridge embedded within a
private driver struct.

Compared to current practice, which is based on [devm_]kzalloc() allocation
followed by open-coded initialization of fields, this allows to have a
common and explicit API to allocate and initialize DRM bridges.

Besides being useful to consolidate bridge driver code, this is a
fundamental step in preparation for adding dynamic lifetime to bridges
based on refcount.

Reviewed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250326-drm-bridge-refcount-v9-1-5e0661fe1f84@bootlin.com
Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com>
This commit is contained in:
Luca Ceresoli
2025-03-26 18:47:35 +01:00
committed by Louis Chauvet
parent 81feddc126
commit 0cc6aadd7f
2 changed files with 39 additions and 0 deletions
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22
drivers/gpu/drm/drm_bridge.c
View File

@@ -199,6 +199,28 @@
static DEFINE_MUTEX(bridge_lock);
static LIST_HEAD(bridge_list);
void *__devm_drm_bridge_alloc(struct device *dev, size_t size, size_t offset,
const struct drm_bridge_funcs *funcs)
{
void *container;
struct drm_bridge *bridge;
if (!funcs) {
dev_warn(dev, "Missing funcs pointer\n");
return ERR_PTR(-EINVAL);
}
container = devm_kzalloc(dev, size, GFP_KERNEL);
if (!container)
return ERR_PTR(-ENOMEM);
bridge = container + offset;
bridge->funcs = funcs;
return container;
}
EXPORT_SYMBOL(__devm_drm_bridge_alloc);
/**
* drm_bridge_add - add the given bridge to the global bridge list
*