-----Original Message----- From: Greg Kroah-Hartman [mailto:[email protected]] Sent: Monday, December 11, 2017 3:35 PM To: Yinbo Zhu <[email protected]> Cc: Felipe Balbi <[email protected]>; Mathias Nyman <[email protected]>; open list:DESIGNWARE USB3 DRD IP DRIVER <[email protected]>; open list:DESIGNWARE USB3 DRD IP DRIVER <[email protected]>; open list <[email protected]>; Xiaobo Xie <[email protected]>; Jerry Huang <[email protected]>; Ran Wang <[email protected]> Subject: Re: [PATCH v2] usb: host: Implement workaround for Erratum A-009611
On Mon, Dec 11, 2017 at 03:15:37AM +0000, Yinbo Zhu wrote: > > > -----Original Message----- > From: Felipe Balbi [mailto:[email protected]] > Sent: Friday, December 08, 2017 6:44 PM > To: Greg Kroah-Hartman <[email protected]>; Yinbo Zhu > <[email protected]> > Cc: Mathias Nyman <[email protected]>; open list:DESIGNWARE USB3 > DRD IP DRIVER <[email protected]>; open list:DESIGNWARE USB3 > DRD IP DRIVER <[email protected]>; open list > <[email protected]>; Xiaobo Xie <[email protected]>; Jerry > Huang <[email protected]>; Ran Wang <[email protected]> > Subject: Re: [PATCH v2] usb: host: Implement workaround for Erratum > A-009611 > > > >Hi, > > >Greg Kroah-Hartman <[email protected]> writes: > > On Fri, Dec 08, 2017 at 05:49:41PM +0800, [email protected] wrote: > >> From: "yinbo.zhu" <[email protected]> > >> > >> Description: This is a occasional problem where the software > > > > No need for a "Description:" word. That's just assumed here, right? > > I will remove "Description:" thanks. > >> issues an End Transfer command while a USB transfer is in progress, > >> resulting in the TxFIFO being flushed when the lower layer is > >> waiting for data,causing the super speed (SS) transmit to get blocked. > >> If the End Transfer command is issued on an IN endpoint to flush > >> out the pending transfers when the same IN endpoint is doing > >> transfers on the USB, then depending upon the timing of the End > >> Transfer (and the resulting internal FIFO flush),the lower layer > >> (U3PTL/U3MAC) could get stuck waiting for data indefinitely. This > >> blocks the transmission path on the SS, and no DP/ACK/ERDY/DEVNOTIF > >> packets can be sent from the device. > >> Impact: If this issue happens and the transmission gets blocked, > >> then the USB host aborts and resets/re-enumerates the device. > >> This unblocks the transmitt engine and the device functions normally. > >> > >> Workaround: Software must wait for all existing TRBs to complete > >> before issuing End transfer command. > >> > >> Configs Affected: > >> LS1088-48A-R1.0, LS2081A-R1.1, LS2088-48A-R1.0, LS2088-48A-R1.1, > >> LX2160-2120-2080A-R1. > > > > What are these Configs? That doesn't seem to match up with anything > > that is in the kernel tree that I can see. > > These configs is soc information, I don't enable it on these platform dts. > Although the erratum issue can't be reproduced. >I do not understand what this means, please explain it a bit better. >thanks, >greg k-h Maybe I have a problem with your words, Your meaning is that you want to ask me why I didn't add an attribute in the device tree to match kernel for every platform, right?
