On Tue, 10 Sep 2019 at 08:36, Greg KH <greg@xxxxxxxxx> wrote: > > On Thu, Sep 05, 2019 at 10:17:45AM -0600, Mathieu Poirier wrote: > > From: Roger Quadros <rogerq@xxxxxx> > > > > 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
