linux-kernel - Re: [PATCH 2/3] ARM: dts: Update the parent for Audss clocks in Exynos5420

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Date:	Wed, 25 Jun 2014 16:21:39 -0700
From:	Kevin Hilman <khilman@...aro.org>
To:	Doug Anderson <dianders@...gle.com>
Cc:	Tushar Behera <tushar.b@...sung.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Kukjin Kim <kgene.kim@...il.com>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel\@lists.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mike Turquette <mturquette@...aro.org>,
	Tomasz Figa <t.figa@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Tushar Behera <trblinux@...il.com>,
	Shaik Ameer Basha <shaik.ameer@...sung.com>
Subject: Re: [PATCH 2/3] ARM: dts: Update the parent for Audss clocks in Exynos5420

Doug Anderson <dianders@...gle.com> writes:

> Tushar,
>
> On Tue, Jun 10, 2014 at 10:32 PM, Tushar Behera <tushar.b@...sung.com> wrote:
>> Currently CLK_FOUT_EPLL was set as one of the parents of AUDSS mux.
>> As per the user manual, it should be CLK_MAU_EPLL.
>>
>> The problem surfaced when the bootloader in Peach-pit board set
>> the EPLL clock as the parent of AUDSS mux. While booting the kernel,
>> we used to get a system hang during late boot if CLK_MAU_EPLL was
>> disabled.
>>
>> Signed-off-by: Tushar Behera <tushar.b@...sung.com>
>> Signed-off-by: Shaik Ameer Basha <shaik.ameer@...sung.com>
>> Reported-by: Kevin Hilman <khilman@...aro.org>
>> ---
>>  arch/arm/boot/dts/exynos5420.dtsi |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> I've tested this myself now as well.
>
> Tested-by: Doug Anderson <dianders@...omium.org>

For me, this patch alone (on top of -next) doesn't solve the boot hang.
I still need clk_ignore_unused for a successful boot.

So, this patch might be correct, but it doesn't prevent a boot hang
using a chain-loaded nv_uboot on peach-pi.  There's still another clock
being disabled that causes a hang.

Kevin
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