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

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Message-ID: <87r2sau3fo.fsf@linux.intel.com>
Date:   Mon, 04 Dec 2017 13:40:11 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Roger Quadros <rogerq@...com>, tony@...mide.com
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, Roger Quadros <rogerq@...com>
Subject: Re: [PATCH] ARM: dts: dra7: Disable USB metastability workaround for USB2

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

-- 
balbi

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