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From: Mathieu Poirier <mathieu.poirier@linaro.org>
To: Greg KH <greg@kroah.com>
Cc: linux-pm@vger.kernel.org, linux-pci@vger.kernel.org,
	linux-usb@vger.kernel.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	dri-devel@lists.freedesktop.org, linux-mtd@lists.infradead.org,
	"# 4 . 7" <stable@vger.kernel.org>,
	linux-omap@vger.kernel.org, linux-i2c@vger.kernel.org
Subject: Re: [BACKPORT 4.14.y 04/18] usb: dwc3: Allow disabling of metastability workaround
Date: Wed, 11 Sep 2019 08:01:40 -0600
Message-ID: <CANLsYkwkq2fLWsGXHxr2tSBLHdfe4JXgu8ehuD1FOEQeDAPNnA@mail.gmail.com> (raw)
In-Reply-To: <20190910143601.GD3362@kroah.com>

On Tue, 10 Sep 2019 at 08:36, Greg KH <greg@kroah.com> wrote:
>
> On Thu, Sep 05, 2019 at 10:17:45AM -0600, Mathieu Poirier wrote:
> > From: Roger Quadros <rogerq@ti.com>
> >
> > commit 42bf02ec6e420e541af9a47437d0bdf961ca2972 upstream
> >
> > Some platforms (e.g. TI's DRA7 USB2 instance) have more trouble
> > with the metastability workaround as it supports only
> > a High-Speed PHY and the PHY can enter into an Erratic state [1]
> > when the controller is set in SuperSpeed mode as part of
> > the metastability workaround.
> >
> > This causes upto 2 seconds delay in enumeration on DRA7's USB2
> > instance in gadget mode.
> >
> > If these platforms can be better off without the workaround,
> > provide a device tree property to suggest that so the workaround
> > is avoided.
> >
> > [1] Device mode enumeration trace showing PHY Erratic Error.
> >      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]
>
> Does the DT also need to get updated with this new id for this?  Is that
> a separate patch somewhere?

The upstream commit is:

b8c9c6fa2002 ARM: dts: dra7: Disable USB metastability workaround for USB2

Should I just send the latter or you prefer a resend with both patches?

Thanks,
Mathieu

>
> thanks,
>
> greg k-h

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Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-05 16:17 [BACKPORT 4.14.y 00/18] Backport candidate from TI 4.14 product kernel Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 01/18] PCI: designware-ep: Fix find_first_zero_bit() usage Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 02/18] PCI: dra7xx: Fix legacy INTD IRQ handling Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 03/18] drm/omap: panel-dsi-cm: fix driver Mathieu Poirier
2019-09-10 14:34   ` Greg KH
2019-09-11 11:48     ` Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 04/18] usb: dwc3: Allow disabling of metastability workaround Mathieu Poirier
2019-09-10 14:36   ` Greg KH
2019-09-11 14:01     ` Mathieu Poirier [this message]
2019-09-05 16:17 ` [BACKPORT 4.14.y 05/18] mfd: palmas: Assign the right powerhold mask for tps65917 Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 06/18] ASoC: tlv320aic31xx: Handle inverted BCLK in non-DSP modes Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 07/18] mtd: spi-nor: enable 4B opcodes for mx66l51235l Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 08/18] mtd: spi-nor: cadence-quadspi: add a delay in write sequence Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 09/18] misc: pci_endpoint_test: Prevent some integer overflows Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 10/18] PCI: dra7xx: Add shutdown handler to cleanly turn off clocks Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 11/18] misc: pci_endpoint_test: Fix BUG_ON error during pci_disable_msi() Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 12/18] mailbox: reset txdone_method TXDONE_BY_POLL if client knows_txdone Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 13/18] ASoC: tlv320dac31xx: mark expected switch fall-through Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 14/18] ASoC: davinci-mcasp: Handle return value of devm_kasprintf Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 15/18] ASoC: davinci: Kill BUG_ON() usage Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 16/18] ASoC: davinci-mcasp: Fix an error handling path in 'davinci_mcasp_probe()' Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 17/18] i2c: omap: Trigger bus recovery in lockup case Mathieu Poirier
2019-09-05 16:17 ` [BACKPORT 4.14.y 18/18] cpufreq: ti-cpufreq: add missing of_node_put() Mathieu Poirier
2019-09-05 16:24 ` [BACKPORT 4.14.y 00/18] Backport candidate from TI 4.14 product kernel Wolfram Sang

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