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

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Message-ID: <4be400281b3fe53b724025ffa837ceed777d7699.camel@collabora.com>
Date: Fri, 18 Apr 2025 08:28:35 -0400
From: Nicolas Dufresne <nicolas.dufresne@...labora.com>
To: Jonas Karlman <jonas@...boo.se>
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

Le vendredi 18 avril 2025 à 08:22 +0200, Jonas Karlman a écrit :
> 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.

Applied locally. With this change, may I have your Rb ?

thanks,
Nicolas

> 
> 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 {
> > 
>