The DRM-managed function to register an encoder is drmm_encoder_alloc() and its variants, which will allocate the underlying structure and initialisation the encoder.
However, we might want to separate the structure creation and the encoder initialisation, for example if the structure is shared across multiple DRM entities, for example an encoder and a connector.
Let's create an helper to only initialise an encoder that would be passed as an argument.
Signed-off-by: Maxime Ripard maxime@cerno.tech --- drivers/gpu/drm/drm_encoder.c | 48 ++++++++++++++++++++++++++++++++--- include/drm/drm_encoder.h | 5 ++++ 2 files changed, 50 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c index a940024c8087..4b7b82f8c6fa 100644 --- a/drivers/gpu/drm/drm_encoder.c +++ b/drivers/gpu/drm/drm_encoder.c @@ -148,9 +148,9 @@ static int __drm_encoder_init(struct drm_device *dev, * the encoder structure. The encoder structure should not be allocated with * devm_kzalloc(). * - * Note: consider using drmm_encoder_alloc() instead of drm_encoder_init() to - * let the DRM managed resource infrastructure take care of cleanup and - * deallocation. + * Note: consider using drmm_encoder_alloc() or drmm_encoder_init() + * instead of drm_encoder_init() to let the DRM managed resource + * infrastructure take care of cleanup and deallocation. * * Returns: * Zero on success, error code on failure. @@ -244,6 +244,48 @@ void *__drmm_encoder_alloc(struct drm_device *dev, size_t size, size_t offset, } EXPORT_SYMBOL(__drmm_encoder_alloc);
+/** + * drmm_encoder_init - Initialize a preallocated encoder + * @dev: drm device + * @encoder: the encoder to init + * @funcs: callbacks for this encoder (optional) + * @encoder_type: user visible type of the encoder + * @name: printf style format string for the encoder name, or NULL for default name + * + * Initializes a preallocated encoder. Encoder should be subclassed as + * part of driver encoder objects. Cleanup is automatically handled + * through registering drm_encoder_cleanup() with drmm_add_action(). The + * encoder structure should be allocated with drmm_kzalloc(). + * + * The @drm_encoder_funcs.destroy hook must be NULL. + * + * Returns: + * Zero on success, error code on failure. + */ +int drmm_encoder_init(struct drm_device *dev, struct drm_encoder *encoder, + const struct drm_encoder_funcs *funcs, + int encoder_type, const char *name, ...) +{ + va_list ap; + int ret; + + if (WARN_ON(funcs && funcs->destroy)) + return -EINVAL; + + va_start(ap, name); + ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, ap); + va_end(ap); + if (ret) + return ret; + + ret = drmm_add_action_or_reset(dev, drmm_encoder_alloc_release, encoder); + if (ret) + return ret; + + return 0; +} +EXPORT_SYMBOL(drmm_encoder_init); + static struct drm_crtc *drm_encoder_get_crtc(struct drm_encoder *encoder) { struct drm_connector *connector; diff --git a/include/drm/drm_encoder.h b/include/drm/drm_encoder.h index 6e91a0280f31..6713fe1804e9 100644 --- a/include/drm/drm_encoder.h +++ b/include/drm/drm_encoder.h @@ -194,6 +194,11 @@ int drm_encoder_init(struct drm_device *dev, const struct drm_encoder_funcs *funcs, int encoder_type, const char *name, ...);
+int drmm_encoder_init(struct drm_device *dev, + struct drm_encoder *encoder, + const struct drm_encoder_funcs *funcs, + int encoder_type, const char *name, ...); + __printf(6, 7) void *__drmm_encoder_alloc(struct drm_device *dev, size_t size, size_t offset,