linux-kernel - Re: [PATCH] usb: dwc2: use a longer AHB idle timeout in dwc2_core

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Message-ID: <CAFBinCD1qj8sNXOK2Pcbz1MAcdvwywPSxQeERNVpmNw=Gmz=Vw@mail.gmail.com>
Date:   Wed, 3 Jul 2019 11:01:10 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     "felipe.balbi@...ux.intel.com" <felipe.balbi@...ux.intel.com>
Cc:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-stable <stable@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] usb: dwc2: use a longer AHB idle timeout in dwc2_core_reset()

On Mon, Jul 1, 2019 at 7:54 PM Martin Blumenstingl
<martin.blumenstingl@...glemail.com> wrote:
>
> On Mon, Jun 24, 2019 at 7:41 AM Minas Harutyunyan
> <Minas.Harutyunyan@...opsys.com> wrote:
> >
> > On 6/20/2019 9:51 PM, Martin Blumenstingl wrote:
> > > Use a 10000us AHB idle timeout in dwc2_core_reset() and make it
> > > consistent with the other "wait for AHB master IDLE state" ocurrences.
> > >
> > > This fixes a problem for me where dwc2 would not want to initialize when
> > > updating to 4.19 on a MIPS Lantiq VRX200 SoC. dwc2 worked fine with
> > > 4.14.
> > > Testing on my board shows that it takes 180us until AHB master IDLE
> > > state is signalled. The very old vendor driver for this SoC (ifxhcd)
> > > used a 1 second timeout.
> > > Use the same timeout that is used everywhere when polling for
> > > GRSTCTL_AHBIDLE instead of using a timeout that "works for one board"
> > > (180us in my case) to have consistent behavior across the dwc2 driver.
> > >
> > > Cc: linux-stable <stable@...r.kernel.org> # 4.19+
> > > Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> > > ---
> >
> > Acked-by: Minas Harutyunyan <hminas@...opsys.com>
> thank you for reviewing this!
>
> is there any chance we can get this fix into Linux 5.3? I know that
> it's too late for 5.2 so I'm fine with skipping that.
thank you Felipe for queuing this for v5.3!
for reference, this patch is now in the usb-for-v5.3-part2 tag: [0]


[0] https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git/commit/?h=usb-for-v5.3-part2&id=dfc4fdebc5d62ac4e2fe5428e59b273675515fb2