linux-kernel - Re: [PATCH v1 4/7] staging: media: starfive: Add multi streams for ISP

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Date: Wed, 6 Mar 2024 17:24:01 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Changhuang Liang <changhuang.liang@...rfivetech.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Hans Verkuil <hverkuil-cisco@...all.nl>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Jack Zhu <jack.zhu@...rfivetech.com>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: Re: [PATCH v1 4/7] staging: media: starfive: Add multi streams for
 ISP

On Wed, Mar 06, 2024 at 01:33:31AM -0800, Changhuang Liang wrote:
> ISP support multi streams output. Add stream_count to save the number
> of stream on.
> 

The ISP can support multiple output streams.  Introduce stream_count to
store the number of streams.  No functional change.

> Signed-off-by: Changhuang Liang <changhuang.liang@...rfivetech.com>
> ---
>  .../staging/media/starfive/camss/stf-isp.c    | 28 +++++++++++++------
>  .../staging/media/starfive/camss/stf-isp.h    |  1 +
>  2 files changed, 21 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/staging/media/starfive/camss/stf-isp.c b/drivers/staging/media/starfive/camss/stf-isp.c
> index 9b5745669fa6..1bfd336b14a1 100644
> --- a/drivers/staging/media/starfive/camss/stf-isp.c
> +++ b/drivers/staging/media/starfive/camss/stf-isp.c
> @@ -92,15 +92,27 @@ static int isp_set_stream(struct v4l2_subdev *sd, int enable)
>  	src = stf_isp_g_index_by_mcode(fmt_t_src, fmt_src->code);
>  
>  	if (enable) {
> -		stf_isp_reset(isp_dev);
> -		stf_isp_init_cfg(isp_dev);
> -		stf_isp_settings(isp_dev, crop, fmt->code);
> -		stf_isp_config_yuv_out_stride(isp_dev, crop->width,
> -					      fmt_t_src->fmts[src].bpp);
> -		stf_isp_stream_set(isp_dev);
> -	}
> +		if (!isp_dev->stream_count) {
> +			stf_isp_reset(isp_dev);
> +			stf_isp_init_cfg(isp_dev);
> +			stf_isp_settings(isp_dev, crop, fmt->code);
> +			stf_isp_config_yuv_out_stride(isp_dev, crop->width,
> +						      fmt_t_src->fmts[src].bpp);
> +			stf_isp_stream_set(isp_dev);
> +
> +			v4l2_subdev_call(isp_dev->source_subdev, video,
> +					 s_stream, enable);

s/enable/true/

> +		}
> +
> +		isp_dev->stream_count++;
> +	} else {
> +		isp_dev->stream_count--;
>  
> -	v4l2_subdev_call(isp_dev->source_subdev, video, s_stream, enable);
> +		if (!isp_dev->stream_count) {
> +			v4l2_subdev_call(isp_dev->source_subdev, video,
> +					 s_stream, enable);

s/enable/false/

> +		}
> +	}

regards,
dan carpenter