linux-kernel - Re: [PATCH v3 00/24] i.MX Media Driver

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Date:   Thu, 2 Feb 2017 22:29:25 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Steve Longerbeam <slongerbeam@...il.com>
Cc:     mark.rutland@....com, andrew-ct.chen@...iatek.com,
        minghsiu.tsai@...iatek.com, nick@...anahar.org,
        songjun.wu@...rochip.com, hverkuil@...all.nl,
        Steve Longerbeam <steve_longerbeam@...tor.com>,
        robert.jarzmik@...e.fr, devel@...verdev.osuosl.org,
        markus.heiser@...marIT.de,
        laurent.pinchart+renesas@...asonboard.com, geert@...ux-m68k.org,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        kernel@...gutronix.de, arnd@...db.de, mchehab@...nel.org,
        bparrot@...com, robh+dt@...nel.org, horms+renesas@...ge.net.au,
        tiffany.lin@...iatek.com, linux-arm-kernel@...ts.infradead.org,
        niklas.soderlund+renesas@...natech.se, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, jean-christophe.trotin@...com,
        p.zabel@...gutronix.de, fabio.estevam@....com, shawnguo@...nel.org,
        sudipm.mukherjee@...il.com
Subject: Re: [PATCH v3 00/24] i.MX Media Driver

On Thu, Feb 02, 2017 at 11:12:41AM -0800, Steve Longerbeam wrote:
> Here is the current .queue_setup() op in imx-media-capture.c:
> 
> static int capture_queue_setup(struct vb2_queue *vq,
>                                unsigned int *nbuffers,
>                                unsigned int *nplanes,
>                                unsigned int sizes[],
>                                struct device *alloc_devs[])
> {
>         struct capture_priv *priv = vb2_get_drv_priv(vq);
>         struct v4l2_pix_format *pix = &priv->vdev.fmt.fmt.pix;
>         unsigned int count = *nbuffers;
> 
>         if (vq->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
>                 return -EINVAL;
> 
>         if (*nplanes) {
>                 if (*nplanes != 1 || sizes[0] < pix->sizeimage)
>                         return -EINVAL;
>                 count += vq->num_buffers;
>         }
> 
>         while (pix->sizeimage * count > VID_MEM_LIMIT)
>                 count--;

That's a weird way of writing:

	unsigned int max_num = VID_MEM_LIMIT / pix->sizeimage;
	count = max(count, max_num);

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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