Den 07.02.2020 09.41, skrev Thomas Zimmermann:
> The simple-encoder helpers initialize an encoder with an empty
> implementation. This covers the requirements of most of the existing
> DRM drivers. A call to drm_simple_encoder_create() allocates and
> initializes an encoder instance, a call to drm_simple_encoder_init()
> initializes a pre-allocated instance.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
> ---
> drivers/gpu/drm/drm_encoder.c | 116 ++++++++++++++++++++++++++++++++++
> include/drm/drm_encoder.h | 10 +++
> 2 files changed, 126 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c
<snip>
> +/**
> + * drm_simple_encoder_create - Allocate and initialize an encoder
> + * @dev: drm device
> + * @encoder_type: user visible type of the encoder
> + * @name: printf style format string for the encoder name, or NULL for
> + * default name
> + *
> + * Allocates and initialises an encoder that has no further functionality. The
> + * encoder will be released automatically.
> + *
> + * Returns:
> + * The encoder on success, a pointer-encoder error code on failure.
> + */
> +struct drm_encoder *drm_simple_encoder_create(struct drm_device *dev,
> + int encoder_type,
> + const char *name, ...)
> +{
> + char *namestr = NULL;
> + struct drm_encoder *encoder;
> + int ret;
> +
> + encoder = devm_kzalloc(dev->dev, sizeof(*encoder), GFP_KERNEL);
The encoder can outlive the devres if the device is unbound when
userspace has open fds, so you can't use devm_ here.
Noralf.
> + if (!encoder)
> + return ERR_PTR(-ENOMEM);
> +
> + if (name) {
> + va_list ap;
> +
> + va_start(ap, name);
> + namestr = kvasprintf(GFP_KERNEL, name, ap);
> + va_end(ap);
> + if (!namestr) {
> + ret = -ENOMEM;
> + goto err_devm_kfree;
> + }
> + }
> +
> + ret = __drm_encoder_init(dev, encoder,
> + &drm_simple_encoder_funcs_destroy,
> + encoder_type, namestr);
> + if (ret)
> + goto err_kfree;
> +
> + return encoder;
> +
> +err_kfree:
> + if (name)
> + kfree(namestr);
> +err_devm_kfree:
> + devm_kfree(dev->dev, encoder);
> + return ERR_PTR(ret);
> +}
> +EXPORT_SYMBOL(drm_simple_encoder_create);
> +
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