Messages in this thread | | | From | Mathias Nyman <> | Subject | Re: earlyprintk=xdbc seems broken | Date | Fri, 17 Dec 2021 13:01:43 +0200 |
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On 3.12.2021 17.29, Greg KH wrote: > On Fri, Dec 03, 2021 at 07:22:57AM -0800, Dave Hansen wrote: >> On 12/3/21 6:31 AM, Mathias Nyman wrote: >>>>> Can you please see if you can repro and fix this? >>>>> >>>>> This all was with current 5.16-rc3 on a tigerlake nuc. >>>>> >>>>> Also, perhaps you can update the guide on what sort of setup/cables >>>>> etc.. you need when either the host or the client is a usb3.1 usb-c only >>>>> device. >>>>> >>>> + Mathias, maybe he still has a USB 3.0 debugging cable. >>>> >>> Should have at the office, I'll pick it up next week and try it out. >> >> Is someone at Intel responsible for this thing? get_maintainer.pl >> doesn't think so: >> >>> $ perl scripts/get_maintainer.pl ./drivers/usb/early/xhci-dbc.c >>> Greg Kroah-Hartman <gregkh@linuxfoundation.org> (supporter:USB SUBSYSTEM) >>> Mike Rapoport <rppt@kernel.org> (commit_signer:1/1=100%,authored:1/1=100%,added_lines:5/5=100%,removed_lines:5/5=100%) >>> Andrew Morton <akpm@linux-foundation.org> (commit_signer:1/1=100%) >>> linux-usb@vger.kernel.org (open list:USB SUBSYSTEM) >>> linux-kernel@vger.kernel.org (open list) > > Intel is the only one that has this hardware :( > >
I can reproduce this. Looks like problems started when driver converted to readl_poll_timeout_atomic() in:
796eed4b2342 usb: early: convert to readl_poll_timeout_atomic()
Seems to hang when read_poll_timeout_atomic() calls ktime_* functions. Maybe it's too early for ktime.
After reverting that patch it works again for me.
-Mathias
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