Hi, Balbi, > -----Original Message----- > From: Felipe Balbi [mailto:felipe.balbi@xxxxxxxxxxxxxxx] > Sent: Thursday, December 08, 2016 6:56 PM > To: Jerry Huang <jerry.huang@xxxxxxx>; stern@xxxxxxxxxxxxxxxxxxx; > linux-usb@xxxxxxxxxxxxxxx; Mathias Nyman > <mathias.nyman@xxxxxxxxxxxxxxx>; Arnd Bergmann <arnd@xxxxxxxx> > Cc: Sriram Dash <sriram.dash@xxxxxxx>; Greg Kroah-Hartman > <gregkh@xxxxxxxxxxxxxxxxxxx> > Subject: RE: USB3.0 DWC3 can't work with latest Linux-4.9.rc7 > > > Hi, > > Jerry Huang <jerry.huang@xxxxxxx> writes: > >> -----Original Message----- > >> From: Felipe Balbi [mailto:felipe.balbi@xxxxxxxxxxxxxxx] > >> Sent: Thursday, December 08, 2016 5:46 PM > >> To: Jerry Huang <jerry.huang@xxxxxxx>; stern@xxxxxxxxxxxxxxxxxxx; > >> linux-usb@xxxxxxxxxxxxxxx; Mathias Nyman > >> <mathias.nyman@xxxxxxxxxxxxxxx>; Arnd Bergmann <arnd@xxxxxxxx> > >> Cc: Sriram Dash <sriram.dash@xxxxxxx>; Greg Kroah-Hartman > >> <gregkh@xxxxxxxxxxxxxxxxxxx> > >> Subject: RE: USB3.0 DWC3 can't work with latest Linux-4.9.rc7 > >> > >> > >> Hi, > >> > >> Jerry Huang <jerry.huang@xxxxxxx> writes: > >> > >> [...] > >> > >> >> >> >> oh, it's the DMA thing. We have patches going to next for this. > >> >> >> >> Arnd, do you know if next has all missing pieces? There was > >> >> >> >> something pending on XHCI IIRC, right? > >> >> >> > So, there are some patches for this issue? Where can I find it? > >> >> >> > I need these > >> >> >> patches for my work. > >> >> >> > >> >> >> https://lkml.org/lkml/2016/11/17/339 > >> >> > You means these below 6 patches? They have been applied to > >> >> > Linux-4.9- > >> >> rc8. > >> >> > Based on Linux-4.9-rc8, I got the error when I connect USB3.0 > >> >> > disk to board > >> >> (USB2.0 disk works well): > >> >> > [ 16.360257] usb 4-1: device descriptor read/8, error -61 > >> >> > So, I think all these 6 patches did not set the USB3.0 DMA > >> >> > coherent correctly, and we need another patch to handle it. > >> >> > >> >> okay, please prepare one such patch :-) > >> > We still need this patch, after applying it to Linux-4.9-rc8, the > >> > USB3.0 can > >> work well. > >> > https://patches.linaro.org/patch/65892/ > >> > dwc3 initiated xhci probe problem in arm64 4.4 kernel due to DMA > >> > setup > >> > >> you're hiding the actual problem. The hole idea for Arnd's work was > >> to fix the problem for all users, not only OF. > > Then, I want to know if this patch can be accepted by open source? Or > > there is another patch to replace it? > > There is no other patch, yet. I can't reproduce this problem here, so you'd > have to debug it and figure out what's the best way to fix it. I found below link, there are some discussion about this issue, http://thread.gmane.org/gmane.linux.usb.general/140374 it seems the patch (commit ID: 1dccb598df549d892b6450c261da54cdd7af44b4) is the root cause. I don't know if I can find out one better solution for it. Maybe I need to create one new file like dwc3-omap.c or dwc3-pci.c to handle the DMA ops? -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
