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Date: Tue, 6 Apr 2021 20:41:30 +0530
From: Pratyush Yadav <p.yadav@...com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC: Mauro Carvalho Chehab <mchehab@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Kishon Vijay Abraham I <kishon@...com>,
Vinod Koul <vkoul@...nel.org>,
Peter Ujfalusi <peter.ujfalusi@...il.com>,
Maxime Ripard <mripard@...nel.org>,
Benoit Parrot <bparrot@...com>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Alexandre Courbot <acourbot@...omium.org>,
Stanimir Varbanov <stanimir.varbanov@...aro.org>,
Helen Koike <helen.koike@...labora.com>,
Michael Tretter <m.tretter@...gutronix.de>,
Peter Chen <peter.chen@....com>,
Chunfeng Yun <chunfeng.yun@...iatek.com>,
<linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-phy@...ts.infradead.org>,
<dmaengine@...r.kernel.org>, Vignesh Raghavendra <vigneshr@...com>,
Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: Re: [PATCH 10/16] media: cadence: csi2rx: Add wrappers for subdev
calls
On 02/04/21 01:47PM, Laurent Pinchart wrote:
> Hi Pratyush,
>
> Thank you for the patch.
Thank you for the review :-)
>
> On Tue, Mar 30, 2021 at 11:03:42PM +0530, Pratyush Yadav wrote:
> > When this bridge driver is being user by another platform driver, it
> > might want to call subdev operations like getting format, setting
> > format, enumerating format codes, etc. Add wrapper functions that pass
> > that call through to the sensor.
> >
> > Currently wrappers are added only for the ops used by TI's platform
> > driver. More can be added later as needed.
>
> This isn't the direction we want to take. For new platforms, propagation
> of subdev configuration should be handled by userspace, using the V4L2
> userspace subdev API. This subdev should not call any subdev operation
> from its source other than .s_stream().
Right. I have replied to Tomi's message about this too. Will move the
driver to use the media controller API.
>
> > Signed-off-by: Pratyush Yadav <p.yadav@...com>
> > ---
> > drivers/media/platform/cadence/cdns-csi2rx.c | 77 ++++++++++++++++++++
> > 1 file changed, 77 insertions(+)
> >
> > diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
> > index 3385e1bc213e..2e8bbc53cb8b 100644
> > --- a/drivers/media/platform/cadence/cdns-csi2rx.c
> > +++ b/drivers/media/platform/cadence/cdns-csi2rx.c
> > @@ -408,12 +408,89 @@ static int csi2rx_s_stream(struct v4l2_subdev *subdev, int enable)
> > return ret;
> > }
> >
> > +static int csi2rx_g_frame_interval(struct v4l2_subdev *subdev,
> > + struct v4l2_subdev_frame_interval *fi)
> > +{
> > + struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
> > +
> > + return v4l2_subdev_call(csi2rx->source_subdev, video, g_frame_interval,
> > + fi);
> > +}
> > +
> > +static int csi2rx_s_frame_interval(struct v4l2_subdev *subdev,
> > + struct v4l2_subdev_frame_interval *fi)
> > +{
> > + struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
> > +
> > + return v4l2_subdev_call(csi2rx->source_subdev, video, s_frame_interval,
> > + fi);
> > +}
> > +
> > +static int csi2rx_enum_mbus_code(struct v4l2_subdev *subdev,
> > + struct v4l2_subdev_pad_config *cfg,
> > + struct v4l2_subdev_mbus_code_enum *code)
> > +{
> > + struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
> > +
> > + return v4l2_subdev_call(csi2rx->source_subdev, pad, enum_mbus_code,
> > + cfg, code);
> > +}
> > +
> > +static int csi2rx_get_fmt(struct v4l2_subdev *subdev,
> > + struct v4l2_subdev_pad_config *cfg,
> > + struct v4l2_subdev_format *fmt)
> > +{
> > + struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
> > +
> > + return v4l2_subdev_call(csi2rx->source_subdev, pad, get_fmt, cfg, fmt);
> > +}
> > +
> > +static int csi2rx_set_fmt(struct v4l2_subdev *subdev,
> > + struct v4l2_subdev_pad_config *cfg,
> > + struct v4l2_subdev_format *fmt)
> > +{
> > + struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
> > +
> > + return v4l2_subdev_call(csi2rx->source_subdev, pad, set_fmt, cfg, fmt);
> > +}
> > +
> > +static int csi2rx_enum_frame_size(struct v4l2_subdev *subdev,
> > + struct v4l2_subdev_pad_config *cfg,
> > + struct v4l2_subdev_frame_size_enum *fse)
> > +{
> > + struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
> > +
> > + return v4l2_subdev_call(csi2rx->source_subdev, pad, enum_frame_size,
> > + cfg, fse);
> > +}
> > +
> > +static int csi2rx_enum_frame_interval(struct v4l2_subdev *subdev,
> > + struct v4l2_subdev_pad_config *cfg,
> > + struct v4l2_subdev_frame_interval_enum *fie)
> > +{
> > + struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
> > +
> > + return v4l2_subdev_call(csi2rx->source_subdev, pad, enum_frame_interval,
> > + cfg, fie);
> > +}
> > +
> > static const struct v4l2_subdev_video_ops csi2rx_video_ops = {
> > .s_stream = csi2rx_s_stream,
> > + .g_frame_interval = csi2rx_g_frame_interval,
> > + .s_frame_interval = csi2rx_s_frame_interval,
> > +};
> > +
> > +static const struct v4l2_subdev_pad_ops csi2rx_pad_ops = {
> > + .enum_mbus_code = csi2rx_enum_mbus_code,
> > + .get_fmt = csi2rx_get_fmt,
> > + .set_fmt = csi2rx_set_fmt,
> > + .enum_frame_size = csi2rx_enum_frame_size,
> > + .enum_frame_interval = csi2rx_enum_frame_interval,
> > };
> >
> > static const struct v4l2_subdev_ops csi2rx_subdev_ops = {
> > .video = &csi2rx_video_ops,
> > + .pad = &csi2rx_pad_ops,
> > };
> >
> > static int csi2rx_async_bound(struct v4l2_async_notifier *notifier,
>
> --
> Regards,
>
> Laurent Pinchart
--
Regards,
Pratyush Yadav
Texas Instruments Inc.
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