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    SubjectRe: earlyprintk=xdbc seems broken
    On Tue, Dec 21, 2021 at 10:40:50AM +0100, Peter Zijlstra wrote:
    > On Fri, Dec 17, 2021 at 02:55:07PM +0100, Peter Zijlstra wrote:
    > > On Fri, Dec 17, 2021 at 01:01:43PM +0200, Mathias Nyman wrote:
    > > > 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()
    > >
    > > I can confirm, reverting that solves the boot hang, things aren't quite
    > > working for me though.
    >
    > I've been poking at this a little, find debug patch and full dmesg
    > below. The TL;DR version of the dmesg seems to be:
    >
    > [ 4.984148] xhci_dbc:xdbc_start: waiting for connection timed out
    > [ 4.984149] xhci_dbc:early_xdbc_setup_hardware: failed to setup the connection to host
    >
    > Initially I thought this was due to delay not being set up properly, but
    > I 'fixed' that, and I've ran out of ideas. I really don't know anything
    > about USB :/

    Any thoughts on this? I'd really like to be able to use this machine but
    can't due to lack of console.

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