linux-kernel - Re: [PATCH] media: v4l2-tpg: Remove unused tpg

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Message-ID: <bb65cb39-eba4-4e0f-a83c-285ab6bae753@jjverkuil.nl>
Date: Wed, 4 Jun 2025 09:09:30 +0200
From: Hans Verkuil <hans@...erkuil.nl>
To: linux@...blig.org, mchehab@...nel.org, linux-media@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: v4l2-tpg: Remove unused tpg_fillbuffer

On 04/06/2025 00:51, linux@...blig.org wrote:
> From: "Dr. David Alan Gilbert" <linux@...blig.org>
> 
> The last use of tpg_fillbuffer() was removed in 2015 by
> commit ddcaee9dd4c0 ("[media] vivid: add support for single buffer planar
> formats")
> 
> Remove it.

Ah, this can't be removed.

This tpg code is actually also used in git://linuxtv.org/v4l-utils.git which
copies the code from the kernel source. And there this function is in use.

This function is really a helper function. I think the best approach is to move
this out of v4l2-tpg-core.c and into v4l2-tpg.h as a static inline.

That way it doesn't add to the kernel code size, but is still available when needed.

Perhaps add a comment in front of this function noting that it is used in v4l-utils.

Regards,

	Hans

> 
> Signed-off-by: Dr. David Alan Gilbert <linux@...blig.org>
> ---
>  drivers/media/common/v4l2-tpg/v4l2-tpg-core.c | 17 -----------------
>  include/media/tpg/v4l2-tpg.h                  |  2 --
>  2 files changed, 19 deletions(-)
> 
> diff --git a/drivers/media/common/v4l2-tpg/v4l2-tpg-core.c b/drivers/media/common/v4l2-tpg/v4l2-tpg-core.c
> index 931e5dc453b9..d51d8ba99dcb 100644
> --- a/drivers/media/common/v4l2-tpg/v4l2-tpg-core.c
> +++ b/drivers/media/common/v4l2-tpg/v4l2-tpg-core.c
> @@ -2710,23 +2710,6 @@ void tpg_fill_plane_buffer(struct tpg_data *tpg, v4l2_std_id std,
>  }
>  EXPORT_SYMBOL_GPL(tpg_fill_plane_buffer);
>  
> -void tpg_fillbuffer(struct tpg_data *tpg, v4l2_std_id std, unsigned p, u8 *vbuf)
> -{
> -	unsigned offset = 0;
> -	unsigned i;
> -
> -	if (tpg->buffers > 1) {
> -		tpg_fill_plane_buffer(tpg, std, p, vbuf);
> -		return;
> -	}
> -
> -	for (i = 0; i < tpg_g_planes(tpg); i++) {
> -		tpg_fill_plane_buffer(tpg, std, i, vbuf + offset);
> -		offset += tpg_calc_plane_size(tpg, i);
> -	}
> -}
> -EXPORT_SYMBOL_GPL(tpg_fillbuffer);
> -
>  MODULE_DESCRIPTION("V4L2 Test Pattern Generator");
>  MODULE_AUTHOR("Hans Verkuil");
>  MODULE_LICENSE("GPL");
> diff --git a/include/media/tpg/v4l2-tpg.h b/include/media/tpg/v4l2-tpg.h
> index a55088921d1d..3e3bd0889b6d 100644
> --- a/include/media/tpg/v4l2-tpg.h
> +++ b/include/media/tpg/v4l2-tpg.h
> @@ -248,8 +248,6 @@ void tpg_calc_text_basep(struct tpg_data *tpg,
>  unsigned tpg_g_interleaved_plane(const struct tpg_data *tpg, unsigned buf_line);
>  void tpg_fill_plane_buffer(struct tpg_data *tpg, v4l2_std_id std,
>  			   unsigned p, u8 *vbuf);
> -void tpg_fillbuffer(struct tpg_data *tpg, v4l2_std_id std,
> -		    unsigned p, u8 *vbuf);
>  bool tpg_s_fourcc(struct tpg_data *tpg, u32 fourcc);
>  void tpg_s_crop_compose(struct tpg_data *tpg, const struct v4l2_rect *crop,
>  		const struct v4l2_rect *compose);