linux-kernel - Re: [PATCH v3 2/4] drm/simple_kms_helper: Add macro drmm_plain_simple_encoder

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Date:   Wed, 24 Mar 2021 04:24:50 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        linux-mips@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, od@...c.me,
        Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH v3 2/4] drm/simple_kms_helper: Add macro
 drmm_plain_simple_encoder_alloc()

Hi Paul,

Thank you for the patch.

On Sun, Jan 24, 2021 at 08:55:50AM +0000, Paul Cercueil wrote:
> This performs the same operation as drmm_simple_encoder_alloc(), but
> only allocates and returns a struct drm_encoder instance.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  include/drm/drm_simple_kms_helper.h | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h
> index e6dbf3161c2f..f07e70303cfb 100644
> --- a/include/drm/drm_simple_kms_helper.h
> +++ b/include/drm/drm_simple_kms_helper.h
> @@ -209,4 +209,21 @@ void *__drmm_simple_encoder_alloc(struct drm_device *dev, size_t size,
>  					     offsetof(type, member), \
>  					     encoder_type))
>  
> +/**
> + * drmm_plain_simple_encoder_alloc - Allocate and initialize a drm_encoder
> + *                                   struct with basic functionality.
> + * @dev: drm device
> + * @encoder_type: user visible type of the encoder
> + *
> + * This performs the same operation as drmm_simple_encoder_alloc(), but
> + * only allocates and returns a struct drm_encoder instance.
> + *
> + * Returns:
> + * Pointer to the new drm_encoder struct, or ERR_PTR on failure.
> + */
> +#define drmm_plain_simple_encoder_alloc(dev, encoder_type) \
> +	((struct drm_encoder *) \
> +	 __drmm_simple_encoder_alloc(dev, sizeof(struct drm_encoder), \
> +				     0, encoder_type))
> +

As this isn't related to the simple encoder helper anymore, how about
using __drmm_encoder_alloc instead ?

#define drmm_plain_simple_encoder_alloc(dev, encoder_type) \
	((struct drm_encoder *) \
	__drmm_encoder_alloc(dev, sizeof(struct drm_encoder), 0, NULL, \
			     encoder_type, NULL))

I'd also rename the macro to drmm_plain_encoder_alloc(), and move it to
drm_encoder.h. That way drivers that don't need the simple KMS helper
won't have to select it just for this.

>  #endif /* __LINUX_DRM_SIMPLE_KMS_HELPER_H */

-- 
Regards,

Laurent Pinchart