linux-kernel - Re: [PATCH v12 30/31] ARM: dts: add System MMU nodes of exynos5250

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 28 Apr 2014 16:13:19 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Vikas Sajjan <sajjan.linux@...il.com>
Cc:	Shaik Ameer Basha <shaik.ameer@...sung.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	iommu@...ts.linux-foundation.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Prathyush <prathyush.k@...sung.com>,
	Grant Grundler <grundler@...omium.org>, joro@...tes.org,
	supash.ramaswamy@...aro.org, Tomasz Figa <tomasz.figa@...il.com>,
	sunil joshi <joshi@...sung.com>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Varun.Sethi@...escale.com, a.motakis@...tualopensystems.com,
	pullip.cho@...sung.com, Tomasz Figa <t.figa@...sung.com>,
	RAHUL SHARMA <rahul.sharma@...sung.com>,
	Abhilash Kesavan <a.kesavan@...sung.com>
Subject: Re: [PATCH v12 30/31] ARM: dts: add System MMU nodes of exynos5250

Vikas,


On Sun, Apr 27, 2014 at 10:39 AM, Vikas Sajjan <sajjan.linux@...il.com> wrote:
> Hi shaik,
>
> +Doug, Abhilash,
>
> On Sun, Apr 27, 2014 at 1:08 PM, Shaik Ameer Basha
> <shaik.ameer@...sung.com> wrote:
>> From: Cho KyongHo <pullip.cho@...sung.com>
>>
>> Signed-off-by: Cho KyongHo <pullip.cho@...sung.com>
>> ---
>>  arch/arm/boot/dts/exynos5250.dtsi |  270 ++++++++++++++++++++++++++++++++++++-
>>  1 file changed, 267 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arm/boot/dts/exynos5250.dtsi b/arch/arm/boot/dts/exynos5250.dtsi
>> index 3742331..eebd397 100644
>> --- a/arch/arm/boot/dts/exynos5250.dtsi
>> +++ b/arch/arm/boot/dts/exynos5250.dtsi
>> @@ -82,6 +82,16 @@
>>                 reg = <0x10044040 0x20>;
>>         };
>>
>> +       pd_isp: isp-power-domain@...0044020 {
>> +               compatible = "samsung,exynos4210-pd";
>> +               reg = <0x10044020 0x20>;
>> +       };
>> +
>> +       pd_disp1: disp1-power-domain@...00440A0 {
>> +               compatible = "samsung,exynos4210-pd";
>> +               reg = <0x100440A0 0x20>;
>> +       };
>> +
>
> As per subject "add System MMU nodes of exynos5250", it should only
> add SysMMU node.
> So, I think adding power domain nodes should go in a separate patch.
>
> Adding power domain nodes can break the system, if powering ON/OFF of
> the given power domain is NOT taken care well.
> I can see ISP is one such case. With this series I can see S2R breaks
> [1] on 5250 chromebook with current mainline kernel (same applies for
> arndale and smdk5250, but I have tested on these boards yet)

Thanks for catching that!  Let's make sure not to break suspend/resume.

Given that these power domains are actually used as the domains for
some of the System MMU nodes I don't totally object to adding them in
the same patch, but if they're breaking things then I agree that we
could leave them out and add them in a later patch (once issues are
sorted out).

-Doug
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/