linux-kernel - Re: [PATCH v9 3/4] media: rkvdec: Add get_image

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Message-ID: <8d1c3c82-dbdc-4064-8188-bab586996302@kwiboo.se>
Date: Fri, 18 Apr 2025 08:22:42 +0200
From: Jonas Karlman <jonas@...boo.se>
To: Nicolas Dufresne <nicolas.dufresne@...labora.com>
Cc: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
 linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 3/4] media: rkvdec: Add get_image_fmt ops

Hi Nicolas,

On 2025-04-17 23:58, Nicolas Dufresne wrote:
> From: Jonas Karlman <jonas@...boo.se>
> 
> Add support for a get_image_fmt() ops that returns the required image
> format.
> 
> The CAPTURE format is reset when the required image format changes and
> the buffer queue is not busy.
> 
> Signed-off-by: Jonas Karlman <jonas@...boo.se>
> Tested-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
> Co-developed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
> Signed-off-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
> ---
>  drivers/staging/media/rkvdec/rkvdec.c | 35 +++++++++++++++++++++++++++++++++++
>  drivers/staging/media/rkvdec/rkvdec.h |  2 ++
>  2 files changed, 37 insertions(+)
> 
> diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
> index 7b780392bb6a63cc954655ef940e87146d2b852f..6c6fe411f48772419e1810d869ab40d168848e65 100644
> --- a/drivers/staging/media/rkvdec/rkvdec.c
> +++ b/drivers/staging/media/rkvdec/rkvdec.c
> @@ -72,6 +72,15 @@ static bool rkvdec_is_valid_fmt(struct rkvdec_ctx *ctx, u32 fourcc,
>  	return false;
>  }
>  
> +static bool rkvdec_fmt_changed(struct rkvdec_ctx *ctx,
> +			       enum rkvdec_image_fmt image_fmt)

Just a small nitpick:

Maybe this function should be called rkvdec_image_fmt_changed() and
could be moved closer to rkvdec_image_fmt_match() as those two are
related to image_fmt and not the pixfmt/fourcc.

Regards,
Jonas

> +{
> +	if (image_fmt == RKVDEC_IMG_FMT_ANY)
> +		return false;
> +
> +	return ctx->image_fmt != image_fmt;
> +}
> +
>  static void rkvdec_fill_decoded_pixfmt(struct rkvdec_ctx *ctx,
>  				       struct v4l2_pix_format_mplane *pix_mp)
>  {
> @@ -118,8 +127,34 @@ static int rkvdec_try_ctrl(struct v4l2_ctrl *ctrl)
>  	return 0;
>  }
>  
> +static int rkvdec_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct rkvdec_ctx *ctx = container_of(ctrl->handler, struct rkvdec_ctx, ctrl_hdl);
> +	const struct rkvdec_coded_fmt_desc *desc = ctx->coded_fmt_desc;
> +	enum rkvdec_image_fmt image_fmt;
> +	struct vb2_queue *vq;
> +
> +	/* Check if this change requires a capture format reset */
> +	if (!desc->ops->get_image_fmt)
> +		return 0;
> +
> +	image_fmt = desc->ops->get_image_fmt(ctx, ctrl);
> +	if (rkvdec_fmt_changed(ctx, image_fmt)) {
> +		vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx,
> +				     V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
> +		if (vb2_is_busy(vq))
> +			return -EBUSY;
> +
> +		ctx->image_fmt = image_fmt;
> +		rkvdec_reset_decoded_fmt(ctx);
> +	}
> +
> +	return 0;
> +}
> +
>  static const struct v4l2_ctrl_ops rkvdec_ctrl_ops = {
>  	.try_ctrl = rkvdec_try_ctrl,
> +	.s_ctrl = rkvdec_s_ctrl,
>  };
>  
>  static const struct rkvdec_ctrl_desc rkvdec_h264_ctrl_descs[] = {
> diff --git a/drivers/staging/media/rkvdec/rkvdec.h b/drivers/staging/media/rkvdec/rkvdec.h
> index 6f8cf50c5d99aad2f52e321f54f3ca17166ddf98..e466a2753ccfc13738e0a672bc578e521af2c3f2 100644
> --- a/drivers/staging/media/rkvdec/rkvdec.h
> +++ b/drivers/staging/media/rkvdec/rkvdec.h
> @@ -73,6 +73,8 @@ struct rkvdec_coded_fmt_ops {
>  		     struct vb2_v4l2_buffer *dst_buf,
>  		     enum vb2_buffer_state result);
>  	int (*try_ctrl)(struct rkvdec_ctx *ctx, struct v4l2_ctrl *ctrl);
> +	enum rkvdec_image_fmt (*get_image_fmt)(struct rkvdec_ctx *ctx,
> +					       struct v4l2_ctrl *ctrl);
>  };
>  
>  enum rkvdec_image_fmt {
>