exynos5420-peach-pi: linux-next boot fails unless mau_epll left enabled?

[Tushar Behera]

On 06/11/2014 01:56 AM, Doug Anderson wrote:
> Javier,
> 
> On Tue, Jun 10, 2014 at 1:03 PM, Javier Martinez Canillas
> <javier.martinez at collabora.co.uk> wrote:
>> Yes, I did not have this issue before. However... I installed the latest Peach
>> pit recovery image you provided me and mainline kernel started to hang on boot.
>> I remembered this thread so tested Kevin's patch which make it boot again.
>>
>> You said that chain-booting u-boot runs the sound init code but did you try
>> booting a signed FIT image using the verified u-boot?
> 
> Right, I'd bet that it's actually verified boot that's calling the
> sound init code (probably just in case it needs to beep at the user).
> ...so this would happen even without chain booting.  I haven't tried
> signing / booting without chain booting, but I can totally believe it
> would hang just as easily.
> 
> 
>> I'm asking because I'm see the hang both when chain-booting nv-u-boot from a
>> kernel partition and booting a signed FIT image with the verified u-boot.
>>
>> So it seems this is a regression in latest U-boot and I didn't run into this
>> before due having an older RW U-Boot on my Peach pit?
> 
> You must have had a very old RW U-Boot, possibly one before audio
> support was added.  I think we just need to fix this in the kernel so
> it doesn't hang.
> 
> -Doug
> 

Hi Kevin,

I have posted the fixes[1] in the mailing list. Please test and update.

Changes:
1 patch in drivers/clk/samsung/clk-exynos-audss.c
1 patch in arch/arm/boot/dts/exynos5420.dtsi

For testing audio in Peach-pi,
1 patch in arch/arm/boot/dts/exynos5800-peach-pi.dts

[1] [PATCH 0/3] Fix boot-hang on Peach-pit and Enable audio

-- 
Tushar Behera