linux-kernel - Re: [PATCH 11/21] media: atmel: atmel-isc-base: implement mbus

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Message-ID: <20211105092559.ce6pdm4hwvxkmutd@uno.localdomain>
Date:   Fri, 5 Nov 2021 10:25:59 +0100
From:   Jacopo Mondi <jacopo@...ndi.org>
To:     Eugen Hristev <eugen.hristev@...rochip.com>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        laurent.pinchart@...asonboard.com, sakari.ailus@....fi,
        robh+dt@...nel.org, nicolas.ferre@...rochip.com
Subject: Re: [PATCH 11/21] media: atmel: atmel-isc-base: implement mbus_code
 support in enumfmt

Hi Eugen,

On Fri, Oct 22, 2021 at 10:52:37AM +0300, Eugen Hristev wrote:
> If enumfmt is called with an mbus_code, the enumfmt handler should only
> return the formats that are supported for this mbus_code.
> To make it more easy to understand the formats, changed the report order
> to report first the native formats, and after that the formats that the ISC
> can convert to.
>
> Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>

Reviewed-by: Jacopo Mondi <jacopo@...ndi.org>

Thanks
   j

> ---
>  drivers/media/platform/atmel/atmel-isc-base.c | 51 ++++++++++++++++---
>  1 file changed, 43 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
> index 2dd2511c7be1..1f7fbe5e4d79 100644
> --- a/drivers/media/platform/atmel/atmel-isc-base.c
> +++ b/drivers/media/platform/atmel/atmel-isc-base.c
> @@ -499,21 +499,56 @@ static int isc_enum_fmt_vid_cap(struct file *file, void *priv,
>  	u32 index = f->index;
>  	u32 i, supported_index;
>
> -	if (index < isc->controller_formats_size) {
> -		f->pixelformat = isc->controller_formats[index].fourcc;
> -		return 0;
> +	supported_index = 0;
> +
> +	for (i = 0; i < isc->formats_list_size; i++) {
> +		if (!isc->formats_list[i].sd_support)
> +			continue;
> +		/*
> +		 * If specific mbus_code is requested, provide only
> +		 * supported formats with this mbus code
> +		 */
> +		if (f->mbus_code && f->mbus_code !=
> +		    isc->formats_list[i].mbus_code)
> +			continue;
> +		if (supported_index == index) {
> +			f->pixelformat = isc->formats_list[i].fourcc;
> +			return 0;
> +		}
> +		supported_index++;
>  	}
>
> -	index -= isc->controller_formats_size;
> +	/*
> +	 * If the sensor does not support this mbus_code whatsoever,
> +	 * there is no reason to advertise any of our output formats
> +	 */
> +	if (supported_index == 0)
> +		return -EINVAL;
> +
> +	/*
> +	 * If the sensor uses a format that is not raw, then we cannot
> +	 * convert it to any of the formats that we usually can with a
> +	 * RAW sensor. Thus, do not advertise them.
> +	 */
> +	if (!isc->config.sd_format ||
> +	    !ISC_IS_FORMAT_RAW(isc->config.sd_format->mbus_code))
> +		return -EINVAL;
>
> +	/*
> +	 * Iterate again through the formats that we can convert to.
> +	 * However, to avoid duplicates, skip the formats that
> +	 * the sensor already supports directly
> +	 */
> +	index -= supported_index;
>  	supported_index = 0;
>
> -	for (i = 0; i < isc->formats_list_size; i++) {
> -		if (!ISC_IS_FORMAT_RAW(isc->formats_list[i].mbus_code) ||
> -		    !isc->formats_list[i].sd_support)
> +	for (i = 0; i < isc->controller_formats_size; i++) {
> +		/* if this format is already supported by sensor, skip it */
> +		if (find_format_by_fourcc(isc, isc->controller_formats[i].fourcc))
>  			continue;
>  		if (supported_index == index) {
> -			f->pixelformat = isc->formats_list[i].fourcc;
> +			f->pixelformat =
> +				isc->controller_formats[i].fourcc;
>  			return 0;
>  		}
>  		supported_index++;
> --
> 2.25.1
>