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

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Date:	Thu, 26 Jun 2014 08:50:50 +0530
From:	Tushar Behera <trblinux@...il.com>
To:	Kevin Hilman <khilman@...aro.org>
Cc:	Doug Anderson <dianders@...gle.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Kukjin Kim <kgene.kim@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel@...ts.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>,
	Shaik Ameer Basha <shaik.ameer@...sung.com>
Subject: Re: [PATCH 2/3] ARM: dts: Update the parent for Audss clocks in Exynos5420

On Thu, Jun 26, 2014 at 4:51 AM, Kevin Hilman <khilman@...aro.org> wrote:
> 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

Kevin,

Can you please check if adding patch 1/3 alongwith patch 2/3 fixes the
issue for you?

Also can you please confirm that setting CLK_IGNORE_UNUSED flag
CLK_MAU_EPLL alone fixes the issue, without any need for
clk_ignore_unused in u-boot bootargs?

-- 
Tushar Behera
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