linux-kernel - RE: [PATCH v2] ARM: exynos: add debug_ll_io_init() call in exynos_init

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Date:	Thu, 06 Jun 2013 08:32:04 +0900
From:	Kukjin Kim <kgene.kim@...sung.com>
To:	'Olof Johansson' <olof@...om.net>,
	'Doug Anderson' <dianders@...omium.org>
Cc:	'Thomas Abraham' <thomas.abraham@...aro.org>,
	'Simon Glass' <sjg@...omium.org>,
	linux-samsung-soc@...r.kernel.org,
	'Tomasz Figa' <tomasz.figa@...il.com>,
	'Russell King' <linux@....linux.org.uk>,
	'Ben Dooks' <ben-linux@...ff.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: RE: [PATCH v2] ARM: exynos: add debug_ll_io_init() call in
 exynos_init_io()

Olof Johansson wrote:
> 
> On Wed, Jun 5, 2013 at 1:56 PM, Doug Anderson <dianders@...omium.org>
> wrote:
> > If the early MMU mapping of the UART happens to get booted out of the
> > TLB between the start of paging_init() and when we finally re-add the
> > UART at the very end of s3c_init_cpu(), we'll get a hang at bootup if
> > we've got early_printk enabled.  Avoid this hang by calling
> > debug_ll_io_init() early.
> >
> > Without this patch, you can reliably reproduce a hang when early
> > printk is enabled by adding flush_tlb_all() at the start of
> > exynos_init_io().  After this patch the hang goes away.
> >
> > Signed-off-by: Doug Anderson <dianders@...omium.org>
> 
> Acked-by: Olof Johansson <olof@...om.net>
> 
> 
> Kukjin, this seems appropriate for 3.10. Do you have other fixes
> queued or should I apply this directly?
> 
If I remember correctly, nothing in my tree for 3.10.

So please go ahead with my ack if you want,

Acked-by: Kukjin Kim <kgene.kim@...sung.com>

Thanks.

- Kukjin

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