linux-kernel - Re: [PATCH v9 4/5] usb: ehci: Add new EHCI driver for Broadcom STB SoC's

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Message-ID: <CAOGqxeXSZY6-NNCvrYmurVb1q9e5_fJVdpU3EwO4vFV+hpxwvg@mail.gmail.com>
Date:   Tue, 12 May 2020 10:24:09 -0400
From:   Alan Cooper <alcooperx@...il.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     ": Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        DTML <devicetree@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        USB list <linux-usb@...r.kernel.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v9 4/5] usb: ehci: Add new EHCI driver for Broadcom STB SoC's

On Mon, May 11, 2020 at 3:51 PM Alan Stern <stern@...land.harvard.edu> wrote:
>
> On Mon, 11 May 2020, Al Cooper wrote:
>
> > Add a new EHCI driver for Broadcom STB SoC's. A new EHCI driver
> > was created instead of adding support to the existing ehci platform
> > driver because of the code required to work around bugs in the EHCI
> > controller. The primary workaround is for a bug where the Core
> > violates the SOF interval between the first two SOFs transmitted after
> > resume. This only happens if the resume occurs near the end of a
> > microframe. The fix is to intercept the ehci-hcd request to complete
> > RESUME and align it to the start of the next microframe.
> >
> > Signed-off-by: Al Cooper <alcooperx@...il.com>
> > Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> > Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
> > ---
>
> I hate to point this out...
>
> > +static int ehci_brcm_probe(struct platform_device *pdev)
> > +{
> > +     struct device *dev = &pdev->dev;
> > +     struct resource *res_mem;
> > +     struct brcm_priv *priv;
> > +     struct usb_hcd *hcd;
> > +     int irq;
> > +     int err;
> > +
> > +     err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
> > +     if (err)
> > +             return err;
> > +
> > +     irq = platform_get_irq(pdev, 0);
> > +     if (irq <= 0)
> > +             return irq ? irq : EINVAL;
>
> That should be -EINVAL.
>
> To tell the truth, I'm not sure it's worthwhile checking for irq == 0.
> That's up to Greg to decide.

Darn, I've been looking at this code for too long :(
Since Greg originally requested <=, I'll fix this and send v10.

Thanks
Al

>
> Anyway, as far as I'm concerned you can either change EINVAL to -EINVAL
> or change the whole thing back to "if (irq < 0) return irq;".  Either
> way, you may add:
>
> Acked-by: Alan Stern <stern@...land.harvard.edu>
>
> Alan Stern
>