linux-kernel - Re: [PATCH v9 2/2] media: v4l: xilinx: Add Xilinx MIPI CSI-2 Rx Subsystem driver

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Date:   Tue, 16 Jul 2019 21:33:18 +0300
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Vishal Sagar <vsagar@...inx.com>
Cc:     Vishal Sagar <vishal.sagar@...inx.com>,
        Hyun Kwon <hyunk@...inx.com>,
        "laurent.pinchart@...asonboard.com" 
        <laurent.pinchart@...asonboard.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        Michal Simek <michals@...inx.com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "hans.verkuil@...co.com" <hans.verkuil@...co.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Dinesh Kumar <dineshk@...inx.com>,
        Sandip Kothari <sandipk@...inx.com>,
        Luca Ceresoli <luca@...aceresoli.net>,
        Jacopo Mondi <jacopo@...ndi.org>
Subject: Re: [PATCH v9 2/2] media: v4l: xilinx: Add Xilinx MIPI CSI-2 Rx
 Subsystem driver

Hi Vishal,

On Thu, Jul 11, 2019 at 09:09:37AM +0000, Vishal Sagar wrote:
...
> > > +static int xcsi2rxss_subscribe_event(struct v4l2_subdev *sd,
> > > +                                  struct v4l2_fh *fh,
> > > +                                  struct v4l2_event_subscription *sub)
> > > +{
> > > +     struct xcsi2rxss_state *xcsi2rxss = to_xcsi2rxssstate(sd);
> > > +     int ret;
> > > +
> > > +     mutex_lock(&xcsi2rxss->lock);
> > > +
> > > +     switch (sub->type) {
> > > +     case V4L2_EVENT_XILINX_CSI2RX_SLBF:
> > > +             ret = v4l2_event_subscribe(fh, sub, XCSI_MAX_EVENT, NULL);
> > 
> > Please either use dev_dbg() or propose an API for conveying this
> > information downstream in the pipeline.
> > 
> 
> I will use a dev_alert() in the irq handler for this for now and remove this event.

dev_dbg(), please, as this is certainly not fatal. We should probably have
an API to tell this to the downstream sub-device driver in the pipeline if
the hardware has no way to detect this independently.

-- 
Regards,

Sakari Ailus