linux-kernel - Re: [PATCH] ARM: dts: dra7: Disable USB metastability workaround for USB2

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Date:   Mon, 11 Dec 2017 08:47:31 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     Roger Quadros <rogerq@...com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: dra7: Disable USB metastability workaround for
 USB2

* Felipe Balbi <balbi@...nel.org> [171204 11:43]:
> Roger Quadros <rogerq@...com> writes:
> 
> > The metastability workaround causes Erratic errors [1]
> > on the HighSpeed USB PHY which can cause upto 2 seconds
> > delay in enumerating to a USB host while in Gadget mode.
> >
> > Disable the Run/Stop metastability workaround to avoid this
> > ill effect. We are aware that this opens up the opportunity
> > for Run/Stop metastability, however this issue has never been
> > observed in TI releases so we think that Run/Stop metastability
> > is a lesser evil than the PHY Erratic errors. So disable it.
> >
> > [1] USB controller trace during gadget enumeration
> >     irq/90-dwc3-969   [000] d...    52.323145: dwc3_event: event (00000901): Erratic Error [U0]
> >     irq/90-dwc3-969   [000] d...    52.560646: dwc3_event: event (00000901): Erratic Error [U0]
> >     irq/90-dwc3-969   [000] d...    52.798144: dwc3_event: event (00000901): Erratic Error [U0]
> >
> > Signed-off-by: Roger Quadros <rogerq@...com>
> 
> FWIW:
> 
> Acked-by: Felipe Balbi <felipe.balbi@...ux/intel.com>
> 
> I'm taking the dwc3 counterpart to v4.16

OK applying this into omap-for-v4.16/dt thanks.

Tony