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Date:   Mon, 16 Oct 2023 10:23:52 +0300
From:   Tony Lindgren <tony@atomide.com>
To:     Mikko Rapeli <mikko.rapeli@linaro.org>
Cc:     Richard Purdie <richard.purdie@linuxfoundation.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-serial@vger.kernel.org,
        openembedded-core <openembedded-core@lists.openembedded.org>,
        Bruce Ashfield <bruce.ashfield@gmail.com>,
        Randy MacLeod <randy.macleod@windriver.com>,
        Paul Gortmaker <paul.gortmaker@windriver.com>
Subject: Re: Kernel 6.5 ttyS1 hang with qemu (was Re: [OE-core] Summary of
 the remaining 6.5 kernel serial issue (and 6.5 summary)
Message-ID: <20231016072352.GM27774@atomide.com>
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* Mikko Rapeli <mikko.rapeli@linaro.org> [231016 07:16]:
> Hi,
> 
> On Mon, Oct 16, 2023 at 09:35:01AM +0300, Tony Lindgren wrote:
> > * Richard Purdie <richard.purdie@linuxfoundation.org> [231015 21:30]:
> > > On Sun, 2023-10-15 at 17:31 +0200, Greg Kroah-Hartman wrote:
> > > > Can you try the patch below?  I just sent it to Linus and it's from Tony
> > > > to resolve some other pm issues with the serial port code.
> > > 
> > > Thanks for the pointer to this. I've put it through some testing and
> > > had one failure so far so I suspect this isn't enough unfortunately.
> > >
> > > FWIW I was looping the testing on the complete removal of the
> > > conditions and didn't see any failures with that.
> > 
> > Care to clarify what's the failing test now?
> > 
> > Is the issue still the second port not always coming up after boot or
> > something else?
> 
> Yes, data from the ttyS1 getty is not coming through from kernel and qemu to
> the test framework looking for login prompt after qemu machine boot.
> Workarounds like sending "\n\n" from the test framework through qemu to ttyS1
> or "echo helloB > /dev/ttyS1" via working ttyS0 don't seem to help and wake
> it up.

OK so for trying to reproduce this with qemu, is this with the default uarts
or with some -device pci-serial-2x type options?

Regards,

Tony