linux-kernel - Re: [PATCH v5 00/39] i.MX Media Driver

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Date:   Sun, 12 Mar 2017 19:10:02 -0300
From:   Mauro Carvalho Chehab <mchehab@...pensource.com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     Steve Longerbeam <slongerbeam@...il.com>, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, kernel@...gutronix.de,
        fabio.estevam@....com, mchehab@...nel.org, hverkuil@...all.nl,
        nick@...anahar.org, markus.heiser@...marIT.de,
        p.zabel@...gutronix.de, laurent.pinchart+renesas@...asonboard.com,
        bparrot@...com, geert@...ux-m68k.org, arnd@...db.de,
        sudipm.mukherjee@...il.com, minghsiu.tsai@...iatek.com,
        tiffany.lin@...iatek.com, jean-christophe.trotin@...com,
        horms+renesas@...ge.net.au, niklas.soderlund+renesas@...natech.se,
        robert.jarzmik@...e.fr, songjun.wu@...rochip.com,
        andrew-ct.chen@...iatek.com, gregkh@...uxfoundation.org,
        shuah@...nel.org, sakari.ailus@...ux.intel.com, pavel@....cz,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH v5 00/39] i.MX Media Driver

Em Sun, 12 Mar 2017 21:13:24 +0000
Russell King - ARM Linux <linux@...linux.org.uk> escreveu:

> On Sun, Mar 12, 2017 at 05:59:28PM -0300, Mauro Carvalho Chehab wrote:
> > Yet, udev/systemd has some rules that provide an unique name for V4L
> > devices at /lib/udev/rules.d/60-persistent-v4l.rules. Basically, it
> > runs a small application (v4l_id) with creates a persistent symling
> > using rules like this:
> > 
> > 	KERNEL=="video*", ENV{ID_SERIAL}=="?*", SYMLINK+="v4l/by-id/$env{ID_BUS}-$env{ID_SERIAL}-video-index$attr{index}"
> > 
> > Those names are stored at /dev/v4l/by-path.  
> 
> This doesn't help:
> 
> $ ls -Al /dev/v4l/by-id/
> total 0
> lrwxrwxrwx 1 root root 13 Mar 12 19:54 usb-Sonix_Technology_Co.__Ltd._USB_2.0_Camera-video-index0 -> ../../video10
> $ ls -Al /dev/v4l/by-path/
> total 0
> lrwxrwxrwx 1 root root 12 Mar 12 19:54 platform-2040000.vpu-video-index0 -> ../../video0
> lrwxrwxrwx 1 root root 12 Mar 12 19:54 platform-2040000.vpu-video-index1 -> ../../video1
> lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index0 -> ../../video2
> lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index1 -> ../../video3
> lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index2 -> ../../video4
> lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index3 -> ../../video5
> lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index4 -> ../../video6
> lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index5 -> ../../video7
> lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index6 -> ../../video8
> lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index7 -> ../../video9
> lrwxrwxrwx 1 root root 13 Mar 12 19:54 platform-ci_hdrc.0-usb-0:1:1.0-video-index0 -> ../../video10
> 
> The problem is the "platform-capture-subsystem-video-index" entries.
> These themselves change order.  For instance, I now have:
> 
> - entity 72: ipu1_csi0 capture (1 pad, 1 link)
>              type Node subtype V4L flags 0
>              device node name /dev/video6
> 
> which means it's platform-capture-subsystem-video-index4.  Before, it
> was platform-capture-subsystem-video-index2.

That's a driver problem. v4l_id gets information to build the persistent
name from the result of VIDIOC_QUERYCAP.

In the case of Exynos gsc driver, for example, the information is here:

static int gsc_m2m_querycap(struct file *file, void *fh,
			   struct v4l2_capability *cap)
{
	struct gsc_ctx *ctx = fh_to_ctx(fh);
	struct gsc_dev *gsc = ctx->gsc_dev;

	strlcpy(cap->driver, GSC_MODULE_NAME, sizeof(cap->driver));
	strlcpy(cap->card, GSC_MODULE_NAME " gscaler", sizeof(cap->card));
	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
		 dev_name(&gsc->pdev->dev));
	cap->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE |
		V4L2_CAP_VIDEO_CAPTURE_MPLANE |	V4L2_CAP_VIDEO_OUTPUT_MPLANE;

	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
	return 0;
}

See that the bus_info there is filled with:

	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s", dev_name(&gsc->pdev->dev));

>From the output you printed, it seems that the i.MX6 is just doing:
	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:");
for some devices.

If you change the i.MX6 driver to do the same, you'll likely be able to
have unique names there too.

Regards,
Mauro