Re: [PATCH v3 2/7] drm/simple_kms_helper: add drmm_simple_encoder_alloc()

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Philipp,

Thank you for the patch.

On Fri, Sep 11, 2020 at 03:57:19PM +0200, Philipp Zabel wrote:
> Add an alternative to drm_simple_encoder_init() that allocates and
> initializes a simple encoder and registers drm_encoder_cleanup() with
> drmm_add_action_or_reset().
> 
> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
> ---
>  drivers/gpu/drm/drm_simple_kms_helper.c | 12 ++++++++++++
>  include/drm/drm_simple_kms_helper.h     | 24 ++++++++++++++++++++++++
>  2 files changed, 36 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
> index 74946690aba4..3cbbfb0f9b51 100644
> --- a/drivers/gpu/drm/drm_simple_kms_helper.c
> +++ b/drivers/gpu/drm/drm_simple_kms_helper.c
> @@ -9,6 +9,7 @@
>  #include <drm/drm_atomic.h>
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_bridge.h>
> +#include <drm/drm_managed.h>
>  #include <drm/drm_plane_helper.h>
>  #include <drm/drm_probe_helper.h>
>  #include <drm/drm_simple_kms_helper.h>
> @@ -71,6 +72,17 @@ int drm_simple_encoder_init(struct drm_device *dev,
>  }
>  EXPORT_SYMBOL(drm_simple_encoder_init);
>  
> +static const struct drm_encoder_funcs drmm_simple_encoder_funcs_empty = { };
> +
> +void *__drmm_simple_encoder_alloc(struct drm_device *dev, size_t size,
> +				  size_t offset, int encoder_type)
> +{
> +	return __drmm_encoder_alloc(dev, size, offset,
> +				    &drmm_simple_encoder_funcs_empty,
> +				    encoder_type, NULL);
> +}
> +EXPORT_SYMBOL(__drmm_simple_encoder_alloc);

Do we need this ? Wouldn't it be better support a NULL drm_encoder_funcs
in the core (if we don't already) and use drmm_encoder_alloc() directly
in drivers ?

> +
>  static enum drm_mode_status
>  drm_simple_kms_crtc_mode_valid(struct drm_crtc *crtc,
>  			       const struct drm_display_mode *mode)
> diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h
> index a026375464ff..e6dbf3161c2f 100644
> --- a/include/drm/drm_simple_kms_helper.h
> +++ b/include/drm/drm_simple_kms_helper.h
> @@ -185,4 +185,28 @@ int drm_simple_encoder_init(struct drm_device *dev,
>  			    struct drm_encoder *encoder,
>  			    int encoder_type);
>  
> +void *__drmm_simple_encoder_alloc(struct drm_device *dev, size_t size,
> +				  size_t offset, int encoder_type);
> +
> +/**
> + * drmm_simple_encoder_alloc - Allocate and initialize an encoder with basic
> + *                             functionality.
> + * @dev: drm device
> + * @type: the type of the struct which contains struct &drm_encoder
> + * @member: the name of the &drm_encoder within @type.
> + * @encoder_type: user visible type of the encoder
> + *
> + * Allocates and initializes an encoder that has no further functionality.
> + * Settings for possible CRTC and clones are left to their initial values.
> + * Cleanup is automatically handled through registering drm_encoder_cleanup()
> + * with drmm_add_action().
> + *
> + * Returns:
> + * Pointer to new encoder, or ERR_PTR on failure.
> + */
> +#define drmm_simple_encoder_alloc(dev, type, member, encoder_type) \
> +	((type *)__drmm_simple_encoder_alloc(dev, sizeof(type), \
> +					     offsetof(type, member), \
> +					     encoder_type))
> +
>  #endif /* __LINUX_DRM_SIMPLE_KMS_HELPER_H */

-- 
Regards,

Laurent Pinchart
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