linux-kernel - Re: [PATCH v4 18/36] media: Add i.MX media core driver

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Date:   Fri, 17 Feb 2017 09:34:36 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Steve Longerbeam <slongerbeam@...il.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        kernel@...gutronix.de, fabio.estevam@....com,
        linux@...linux.org.uk, mchehab@...nel.org, hverkuil@...all.nl,
        nick@...anahar.org, markus.heiser@...marIT.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 v4 18/36] media: Add i.MX media core driver

On Thu, 2017-02-16 at 17:33 -0800, Steve Longerbeam wrote:
> 
> On 02/16/2017 05:02 AM, Philipp Zabel wrote:
> > On Wed, 2017-02-15 at 18:19 -0800, Steve Longerbeam wrote:
> <snip>
> >> +
> >> +- Clean up and move the ov5642 subdev driver to drivers/media/i2c, and
> >> +  create the binding docs for it.
> >
> > This is done already, right?
> 
> 
> I cleaned up ov5640 and moved it to drivers/media/i2c with binding docs,
> but not the ov5642 yet.

Ok, thanks.

> >> +- The Frame Interval Monitor could be exported to v4l2-core for
> >> +  general use.
> >> +
> >> +- The subdev that is the original source of video data (referred to as
> >> +  the "sensor" in the code), is called from various subdevs in the
> >> +  pipeline in order to set/query the video standard ({g|s|enum}_std)
> >> +  and to get/set the original frame interval from the capture interface
> >> +  ([gs]_parm). Instead, the entities that need this info should call its
> >> +  direct neighbor, and the neighbor should propagate the call to its
> >> +  neighbor in turn if necessary.
> >
> > Especially the [gs]_parm fix is necessary to present userspace with the
> > correct frame interval in case of frame skipping in the CSI.
> 
> 
> Right, understood. I've added this to list of fixes for version 5.
> 
> What a pain though! It means propagating every call to g_frame_interval
> upstream until a subdev "that cares" returns ret == 0 or
> ret != -ENOIOCTLCMD. And that goes for any other chained subdev call
> as well.

Not at all. Since the frame interval is a property of the pad, that had
to be propagated downstream by media-ctl along with media bus format,
frame size, and colorimetry earlier.

regards
Philipp