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Date:   Thu, 26 May 2022 09:20:31 +0300
From:   Tony Lindgren <tony@atomide.com>
To:     Yegor Yefremov <yegorslists@googlemail.com>
Cc:     Arnd Bergmann <arnd@arndb.de>, Ard Biesheuvel <ardb@kernel.org>,
        Linux-OMAP <linux-omap@vger.kernel.org>,
        linux-clk <linux-clk@vger.kernel.org>,
        Stephen Boyd <sboyd@kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: am335x: 5.18.x: system stalling
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* Yegor Yefremov <yegorslists@googlemail.com> [220526 05:45]:
> On Tue, May 24, 2022 at 4:19 PM Tony Lindgren <tony@atomide.com> wrote:
> > Maybe also try with CONFIG_MUSB_PIO_ONLY=y to see if it makes things
> > better or worse :)
> 
> PIO is always the last resort :-) And now it proves it again. With
> PIO_ONLY the system doesn't stall.

OK great :) So it has something to do with drivers/dma/ti/cppi41.c, or
with drivers/usb/musb/cppi_dma.c or whatever the dma for am335x here
is. Or maybe there's something using stack for buffers being passed to
dma again that breaks with vmap stack.

Regards,

Tony