Hi, Vicente Bergas <vicencb@xxxxxxxxx> writes: > On Monday, July 22, 2019 4:31:27 PM CEST, Vicente Bergas wrote: >> Hi, i have been running linux on rk3399 booted with kexec fine until 5.2 >> From 5.2 onwards, there are memory corruption issues as reported here: >> http://lkml.iu.edu/hypermail/linux/kernel/1906.2/07211.html >> kexec has been identified as the principal reason for the issues. >> >> It turns out that kexec has never worked reliably on this platform, >> i was just lucky until recently. >> >> Please, can you provide some directions on how to debug the issue? > > Thank you all for your suggestions on where the issue could be. > > It seems that it was the USB driver. > Now using v5.2.8 booted with kexec from v5.2.8 with a workaround and > so far so good. It is being tested on the Sapphire board. > > The workaround is: > --- a/drivers/usb/dwc3/dwc3-of-simple.c > +++ b/drivers/usb/dwc3/dwc3-of-simple.c > @@ -133,6 +133,13 @@ > return 0; > } > > +static void dwc3_of_simple_shutdown(struct platform_device *pdev) > +{ > + struct dwc3_of_simple *simple = platform_get_drvdata(pdev); > + > + reset_control_assert(simple->resets); > +} > + > static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device > *dev) > { > struct dwc3_of_simple *simple = dev_get_drvdata(dev); > @@ -190,6 +197,7 @@ > static struct platform_driver dwc3_of_simple_driver = { > .probe = dwc3_of_simple_probe, > .remove = dwc3_of_simple_remove, > + .shutdown = dwc3_of_simple_shutdown, > .driver = { > .name = "dwc3-of-simple", > .of_match_table = of_dwc3_simple_match, > > If this patch is OK after review i can resubmit it as a pull request. not a pull request, just send a patch using git send-email > Should a similar change be applied to drivers/usb/dwc3/core.c ? Is it necessary? We haven't had any bug reports regarding that. Also, if we have reset control support in the core driver, why do we need it in of_simple? Seems like of_simple could just rely on what core does. -- balbi
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