linux-kernel - Re: [PATCH v5 4/5] ARM: dts: mt8135: enable basic SMP bringup for mt8135

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Message-ID: <7hlhamjawi.fsf@deeprootsystems.com>
Date:	Thu, 29 Oct 2015 02:12:45 -0700
From:	Kevin Hilman <khilman@...nel.org>
To:	Eddie Huang <eddie.huang@...iatek.com>
Cc:	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	"devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	<srv_heupstream@...iatek.com>, Arnd Bergmann <arnd@...db.de>,
	Tyler Baker <tyler.baker@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Olof Johansson <olof@...om.net>,
	Rob Herring <robh+dt@...nel.org>,
	<linux-mediatek@...ts.infradead.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Matthias Brugger <matthias.bgg@...il.com>,
	"linux-arm-kernel\@lists.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 4/5] ARM: dts: mt8135: enable basic SMP bringup for mt8135

Eddie Huang <eddie.huang@...iatek.com> writes:

> Hi Kevin,
>
> On Mon, 2015-10-26 at 17:06 +0900, Kevin Hilman wrote:
>> On Mon, Oct 26, 2015 at 4:15 PM, Yingjoe Chen <yingjoe.chen@...iatek.com> wrote:
>> > On Mon, 2015-10-26 at 09:56 +0900, Kevin Hilman wrote:
>> >> Hello,
>> >>
>> >> On Sat, Oct 3, 2015 at 12:19 AM, Yingjoe Chen <yingjoe.chen@...iatek.com> wrote:
>> >> > Add arch timer node to enable arch-timer support. MT8135 firmware
>> >> > doesn't correctly setup arch-timer frequency and CNTVOFF, add
>> >> > properties to workaround this.
>> >> >
>> >> > This also set cpu enable-method to enable SMP.
>> >> >
>> >> > Signed-off-by: Yingjoe Chen <yingjoe.chen@...iatek.com>
>> >>
>> >> kernelci.org started detecting new boot failures for the mt8135-evb in
>> >> the arm-soc tree[1], and the boot failures were bisected down to this
>> >> patch, which landed upstream in the form of commit d186a394bb98 (ARM:
>> >> dts: mt8135: enable basic SMP bringup for mt8135)
>> >>
>> >> Maybe this new SMP support requires updating the firmware on the board
>> >> as well?  If so, the changelog should've been a bit more explicit
>> >> about firmware dependencies.
>> >
>> > Kevin,
>> >
>> > Thanks for testing.
>> >
>> > No, it doesn't need new firmware. Will test to see what's going wrong.
>> 
>> Thanks for following up.  I'll be glad to test any patches if you have
>> anything you'd like me to test.
>
> You need "clockevents/drivers/mtk: Fix spurious interrupt leading to
> crash" (https://lkml.org/lkml/2015/8/24/803)
>
> Daniel Lezcano already applied this patch in his tree for 4.4.
> (https://git.linaro.org/people/daniel.lezcano/linux.git)
>

Thanks for letting us know.

In the future, these kinds of cross-tree dependencies are important to
mention in the cover letter of  the pull request so we can setup
dependency branches and keep arm-soc/for-next building and booting.

Kevin
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