linux-kernel - Re: [PATCHv2 4/4] media: imx: Use dedicated format handler for i.MX7/8

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Date:   Thu, 4 Nov 2021 12:45:05 +0100
From:   Dorota Czaplejewicz <dorota.czaplejewicz@...i.sm>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Steve Longerbeam <slongerbeam@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...i.sm, phone-devel@...r.kernel.org
Subject: Re: [PATCHv2 4/4] media: imx: Use dedicated format handler for
 i.MX7/8

Hi,

On Wed, 3 Nov 2021 13:41:00 +0300
Dan Carpenter <dan.carpenter@...cle.com> wrote:

> On Sun, Oct 17, 2021 at 01:08:37PM +0200, Dorota Czaplejewicz wrote:
> > +static int imx78_media_mbus_fmt_to_pix_fmt(struct v4l2_pix_format *pix,
> > +					   const struct v4l2_mbus_framefmt *mbus,
> > +					   const struct imx_media_pixfmt *cc)
> > +{
> > +	u32 width;
> > +	u32 stride;
> > +	u8 divisor;
> > +
> > +	if (!cc) {
> > +		cc = imx_media_find_ipu_format(mbus->code,
> > +					       PIXFMT_SEL_YUV_RGB);
> > +		if (!cc)
> > +			cc = imx_media_find_mbus_format(mbus->code,
> > +							PIXFMT_SEL_ANY);
> > +		if (!cc)
> > +			return -EINVAL;
> > +	}
> > +
> > +	/*
> > +	 * TODO: the IPU currently does not support the AYUV32 format,
> > +	 * so until it does convert to a supported YUV format.
> > +	 */
> > +	if (cc->ipufmt && cc->cs == IPUV3_COLORSPACE_YUV) {
> > +		u32 code;
> > +
> > +		imx_media_enum_mbus_formats(&code, 0, PIXFMT_SEL_YUV);
> > +		cc = imx_media_find_mbus_format(code, PIXFMT_SEL_YUV);  
> 
> Do we need a if (!cc) NULL check after this assignment?

In v3 of this series, this statement is only present in the IMX56 code path, which is unmodified compared to the original.

However, there's a missing check in the IMX78. I'm not sure if those can fail in practice, but for the sake of correctness, I rolled out an updated v4 series, where both checks are present. Message-id: 20211104113631.206899-1-dorota.czaplejewicz@...i.sm

Cheers,
Dorota
> 
> > +	}
> > +
> > +	/*
> > +	 * The hardware can handle line lengths divisible by 4 bytes,
> > +	 * as long as the number of lines is even.
> > +	 * Otherwise, use the value of 8 bytes recommended in the datasheet.
> > +	 */
> > +	divisor = 4 << (mbus->height % 2);
> > +
> > +	width = round_up(mbus->width, divisor);
> > +
> > +	if (cc->planar)
> > +		stride = round_up(width, 16);
> > +	else
> > +		stride = round_up((width * cc->bpp) >> 3, divisor);
> > +
> > +	pix->width = width;
> > +	pix->height = mbus->height;
> > +	pix->pixelformat = cc->fourcc;
> > +	pix->colorspace = mbus->colorspace;
> > +	pix->xfer_func = mbus->xfer_func;
> > +	pix->ycbcr_enc = mbus->ycbcr_enc;
> > +	pix->quantization = mbus->quantization;
> > +	pix->field = mbus->field;
> > +	pix->bytesperline = stride;
> > +	pix->sizeimage = cc->planar ? ((stride * pix->height * cc->bpp) >> 3) :
> > +			 stride * pix->height;
> > +
> > +	return 0;
> > +}  
> 
> regards,
> dan carpenter


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