linux-kernel - Re: [PATCH v2 12/12] ipu3-cio2: Add cio2-bridge to ipu3-cio2 driver

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Date:   Sat, 19 Dec 2020 20:52:29 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Daniel Scally <djrscally@...il.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        devel@...ica.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yong Zhi <yong.zhi@...el.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Bingbu Cao <bingbu.cao@...el.com>,
        Tian Shu Qiu <tian.shu.qiu@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        kieran.bingham+renesas@...asonboard.com,
        Linus Walleij <linus.walleij@...aro.org>,
        "Krogerus, Heikki" <heikki.krogerus@...ux.intel.com>,
        Tsuchiya Yuto <kitakar@...il.com>, jorhand@...ux.microsoft.com
Subject: Re: [PATCH v2 12/12] ipu3-cio2: Add cio2-bridge to ipu3-cio2 driver

On Sat, Dec 19, 2020 at 2:25 AM Daniel Scally <djrscally@...il.com> wrote:
> On 18/12/2020 21:17, Andy Shevchenko wrote:
> > On Thu, Dec 17, 2020 at 11:43:37PM +0000, Daniel Scally wrote:

...

> >> +    sensor->ep_properties[0] = PROPERTY_ENTRY_U32(sensor->prop_names.bus_type, 4);
> >
> > Does 4 has any meaning that can be described by #define ?
>
> It's V4L2_FWNODE_BUS_TYPE_CSI2_DPHY:
>
> https://elixir.bootlin.com/linux/latest/source/drivers/media/v4l2-core/v4l2-fwnode.c#L36
>
> That enum's not in an accessible header, but I can define it in this
> module's header

Maybe you can do a preparatory patch to make it visible to v4l2
drivers? (Like moving to one of v4l2 headers)

...

> >> +                    if (bridge->n_sensors >= CIO2_NUM_PORTS) {
> >> +                            dev_warn(&cio2->dev, "Exceeded available CIO2 ports\n");
> >
> >> +                            /* overflow i so outer loop ceases */
> >> +                            i = ARRAY_SIZE(cio2_supported_sensors);
> >> +                            break;
> >
> > Why not to create a new label below and assign ret here with probably comment
> > why it's not an error?
>
> Sure, I can do that, but since it wouldn't need any cleanup I could also
> just return 0 here as Laurent suggest (but with a comment explaining why
> that's ok as you say) - do you have a preference?

While it's a good suggestion it will bring a bit of inconsistency into
approach. Everywhere else in the function you are using the goto
approach.
So yes, I have a preference.

> >> +                    }

...

> >> +                    ret = cio2_bridge_read_acpi_buffer(adev, "SSDB",
> >> +                                                       &sensor->ssdb,
> >> +                                                       sizeof(sensor->ssdb));
> >> +                    if (ret < 0)
> >
> > if (ret) (because positive case can be returned just by next conditional).
>
> cio2_bridge_read_acpi_buffer() returns the buffer length on success at
> the moment, but I can change it to return 0 and have this be if (ret)

Please correct this somehow, because the next failure returns it
instead of error...

> >> +                            goto err_put_adev;
> >> +
> >> +                    if (sensor->ssdb.lanes > 4) {
> >> +                            dev_err(&adev->dev,
> >> +                                    "Number of lanes in SSDB is invalid\n");

...I'm even thinking that you have to assign ret here to something meaningful.

> >> +                            goto err_put_adev;
> >> +                    }

-- 
With Best Regards,
Andy Shevchenko