Re: [PATCH 1/1] ARM: dts: Make DP a consumer of DISP1 power domain on Exynos5420
From: Javier Martinez Canillas
Date: Wed Apr 29 2015 - 20:32:39 EST
On 04/16/2015 09:40 AM, Javier Martinez Canillas wrote:
> On 04/12/2015 10:30 PM, Javier Martinez Canillas wrote:
>> Commit ea08de16eb1b ("ARM: dts: Add DISP1 power domain for exynos5420")
>> added a device node for the Exynos5420 DISP1 power domain but dit not
>> make the DP controller a consumer of that power domain.
>> This causes an "Unhandled fault: imprecise external abort" error if the
>> exynos-dp driver tries to access the DP controller registers and the PD
>> was turned off. This lead to a kernel panic and a complete system hang.
>> Make the DP controller device node a consumer of the DISP1 power domain
>> to ensure that the PD is turned on when the exynos-dp driver is probed.
>> Fixes: ea08de16eb1b ("ARM: dts: Add DISP1 power domain for exynos5420")
>> Signed-off-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx>
> Any comments about this patch?
> It's very trivial but fixes a very important regression on Exynos5420 boards
> with display panel and Peach Pit and Pi have been broken since next-20150401.
> This  is the Peach Pit boot log with yesteday's linux-next for example.
> Best regards,
> : http://arm-soc.lixom.net/bootlogs/next/next-20150415/pit-arm-exynos_defconfig.html
It has been many weeks since this patch has been posted and linux-next
is still broken:
Could you please apply $subject to fix the imprecise external abort issue.
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