Hi Sakari,
On Wed, Nov 01, 2023 at 02:13:14PM +0000, Sakari Ailus wrote:
> Hi Tommaso,
>
> On Tue, Oct 31, 2023 at 12:46:09PM +0100, Tommaso Merciai wrote:
> > > > +static int alvium_get_dt_data(struct alvium_dev *alvium)
> > > > +{
> > > > + struct device *dev = &alvium->i2c_client->dev;
> > > > + struct fwnode_handle *fwnode = dev_fwnode(dev);
> > > > + struct fwnode_handle *endpoint;
> > > > + int ret = -EINVAL;
> > > > +
> > > > + if (!fwnode)
> > > > + return -EINVAL;
> > > > +
> > > > + /* Only CSI2 is supported for now: */
> > > > + alvium->ep.bus_type = V4L2_MBUS_CSI2_DPHY;
> > > > +
> > > > + endpoint = fwnode_graph_get_endpoint_by_id(fwnode, 0, 0, 0);
> > > > + if (!endpoint) {
> > > > + dev_err(dev, "endpoint node not found\n");
> > > > + return -EINVAL;
> > > > + }
> > > > +
> > > > + if (v4l2_fwnode_endpoint_alloc_parse(endpoint, &alvium->ep)) {
> > > > + dev_err(dev, "could not parse endpoint\n");
> > > > + goto error_out;
> > >
> > > This could go to another label to be less confusing, but
> > > v4l2_fwnode_endpoint_free() looks to be a no-op here, so good enough.
> >
> > Thanks for the comment.
> > To be honest right now this is clear to me
> > I prefere to stay on the following :)
> > Prefer to keep just only one path.
>
> You can safely call v4l2_fwnode_endpoint_free() on an unparsed endpoint (or
> on and endpoint the parsing of which failed). I prefer this too.
>
> > > > + ret = -ENODEV;
> > > > + goto err_powerdown;
> > > > + }
> > > > +
> > > > + ret = alvium_get_hw_info(alvium);
> > > > + if (ret) {
> > > > + dev_err(dev, "get_hw_info fail %d\n", ret);
> > > > + goto err_powerdown;
> > > > + }
> > > > +
> > > > + ret = alvium_hw_init(alvium);
> > > > + if (ret) {
> > > > + dev_err(dev, "hw_init fail %d\n", ret);
> > > > + goto err_powerdown;
> > > > + }
> > > > +
> > > > + ret = alvium_setup_mipi_fmt(alvium);
> > > > + if (ret) {
> > > > + dev_err(dev, "setup_mipi_fmt fail %d\n", ret);
> > > > + goto err_powerdown;
> > > > + }
> > > > +
> > > > + /*
> > > > + * Enable runtime PM without autosuspend:
> > > > + *
> > > > + * Don't use pm autosuspend (alvium have ~7s boot time).
> > > > + * Alvium has been powered manually:
> > > > + * - mark it as active
> > > > + * - increase the usage count without resuming the device.
> > > > + */
> > > > + pm_runtime_set_active(dev);
> > > > + pm_runtime_get_noresume(dev);
> > > > + pm_runtime_enable(dev);
> > > > +
> > > > + /* Initialize the V4L2 subdev. */
> > > > + ret = alvium_subdev_init(alvium);
> > > > + if (ret)
> > > > + goto err_pm;
> > > > +
> > > > + ret = v4l2_async_register_subdev(&alvium->sd);
> > > > + if (ret < 0) {
> > > > + dev_err(dev, "Could not register v4l2 device\n");
> > > > + goto err_subdev;
> > > > + }
> > > > +
> > > > + return 0;
> > > > +
> > > > +err_subdev:
> > > > + alvium_subdev_cleanup(alvium);
> > >
> > > Should this also be called by the remove function?
> > > Or is it already handled by an un-register mechanism?
> >
> > Right, I miss this.
> > Thanks.
> > I put this to remove function like:
> >
> > static void alvium_remove(struct i2c_client *client)
> > {
> > struct v4l2_subdev *sd = i2c_get_clientdata(client);
> > struct alvium_dev *alvium = sd_to_alvium(sd);
> > struct device *dev = &alvium->i2c_client->dev;
> >
> > /*
> > * Disable runtime PM. In case runtime PM is disabled in the kernel,
> > * make sure to turn power off manually.
> > */
> > pm_runtime_disable(dev);
> > if (!pm_runtime_status_suspended(dev))
> > alvium_power_on(alvium, false);
> > pm_runtime_set_suspended(dev);
> >
> > alvium_subdev_cleanup(alvium);
> > i2c_unregister_device(alvium->i2c_client);
>
> This doesn't belong here (as you didn't register it). It was missed in the
> review earlier.
Arg.. Good catch! Thanks :)
You are right we remove i2c_register into some previous review.
Regards,
Tommaso
>
> > }
> >
> >
> > If for you Cristophe, Sakari, Laurent,
> > it's ok I prefer to skip v11 that I sent this morning too early.
> > I collected hints from Cristophe right now and I plan to send v12
> > this afternoon/evening if for you all is ok.
> >
> > https://github.com/avs-sas/linux/blob/tm/media_stage/v6.6.0-rc3/alvium_drv/v12/drivers/media/i2c/alvium-csi2.c
> >
> > Please let me know.
> >
> > Thanks again to all! :)
>
> --
> Regards,
>
> Sakari Ailus
