linux-kernel - Re: [PATCH v2] usb: host: Implement workaround for Erratum A-009611

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Date:   Mon, 11 Dec 2017 08:34:43 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Yinbo Zhu <yinbo.zhu@....com>
Cc:     Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        "open list:DESIGNWARE USB3 DRD IP DRIVER" <linux-usb@...r.kernel.org>,
        "open list:DESIGNWARE USB3 DRD IP DRIVER" 
        <linux-omap@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Xiaobo Xie <xiaobo.xie@....com>,
        Jerry Huang <jerry.huang@....com>,
        Ran Wang <ran.wang_1@....com>
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:felipe.balbi@...ux.intel.com] 
> Sent: Friday, December 08, 2017 6:44 PM
> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>; Yinbo Zhu <yinbo.zhu@....com>
> Cc: Mathias Nyman <mathias.nyman@...el.com>; open list:DESIGNWARE USB3 DRD IP DRIVER <linux-usb@...r.kernel.org>; open list:DESIGNWARE USB3 DRD IP DRIVER <linux-omap@...r.kernel.org>; open list <linux-kernel@...r.kernel.org>; Xiaobo Xie <xiaobo.xie@....com>; Jerry Huang <jerry.huang@....com>; Ran Wang <ran.wang_1@....com>
> Subject: Re: [PATCH v2] usb: host: Implement workaround for Erratum A-009611
> 
> 
> >Hi,
> 
> >Greg Kroah-Hartman <gregkh@...uxfoundation.org> writes:
> > On Fri, Dec 08, 2017 at 05:49:41PM +0800, yinbo.zhu@....com wrote:
> >> From: "yinbo.zhu" <yinbo.zhu@....com>
> >> 
> >> 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