From: ta.omasab@gmail.com (Thomas Abraham)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v9 4/6] ARM: Exynos: switch to using generic cpufreq driver for Exynos4210/5250/5420
Date: Fri, 29 Aug 2014 18:22:16 +0530 [thread overview]
Message-ID: <CAJuA9ajtsrY7zSDMs=c6BZ0AqERoBgvq++dTF4Dn673zGMfcgQ@mail.gmail.com> (raw)
In-Reply-To: <CAGa+x86jU8MR=r_xuaiorbNNyqrezb0b6Ozy-MPg9HvsARESOw@mail.gmail.com>
Hi Kevin,
On Wed, Aug 27, 2014 at 3:55 AM, Kevin Hilman <khilman@linaro.org> wrote:
> On Tue, Aug 26, 2014 at 8:15 AM, Kevin Hilman <khilman@linaro.org> wrote:
>> On Mon, Aug 25, 2014 at 10:25 PM, Chander Kashyap <k.chander@samsung.com> wrote:
>
> [...]
>
>>>>
>>>> Can you clarify how you're setting the voltages to ensure stability?
>>>
>>> below is the diff : wip/exynos/integ
>>
>> Thanks.
>>
>> I've applied your patch, and bootup shows vdd_arm and vdd_kfc at
>> 1500mV, but still when booting with cpuidle enabled (bL switcher
>> disabled), I'm seeing lockups with no kernel output. With CPUidle
>> disabled, things are pretty stable.
>>
>> What tree are you using to test this out on 5420? I'm using mainline
>> v3.17-rc1 + DT patch for CPUidle and this cpufreq series. See my
>> wip/exynos/integ branch at
>> git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux.git.
>
> I mis-stated this. Actually my tree is based on the v3.17-rc1 branch
> of the exynos-reference tree[1] + the above mentioned patches for
> cpuidle and cpufreq.
>
> Also, I've narrowed down the instability a bit, and it's not related
> to CPUidle. I can now trigger a boot hang even without CPUidle
> enabled. Here's a quick way to cause a boot lockup. With the switcher
> disabled, I enable CPUfreq and set the default governor to
> performance. As soon as cpufreq driver loads, it tries to use the top
> frequences for both clusters, and it hangs.
>
> Selectively disabling frequencies, I narrowed it down to the 1.3GHz
> and 1.2GHz frequencies of the little cluster. With these commented
> out in the DT, it will fully boot with the performance governor
> enabled.
>
> So that leads to the question. Are all of the operating points in
> exynos5420.dtsi valid for exynos5800, and have they been validated?
I tried to recreate the boot lockup issue using the same steps you
listed above for the Exynos5800 peach-pi platform (Chromebook2), but I
do not see any issues. I can see both clusters with max clock speed
after boot (1.8GHz and 1.3GHz).
I am using v3.17-rc2 + CPUFreq Patches + max77802 regulator support
patches for Chromebook2 + temp hack to set A15 voltage to 1.35V and A7
voltage to 1.3V.
Sorry for the delaying in following up.
Thanks,
Thomas.
>
> Kevin
>
> [1]https://github.com/exynos-reference/kernel.git
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next prev parent reply other threads:[~2014-08-29 12:52 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-30 8:07 [PATCH v9 0/6] cpufreq: use generic cpufreq drivers for exynos platforms Thomas Abraham
2014-07-30 8:07 ` [PATCH v9 1/6] clk: samsung: add infrastructure to register cpu clocks Thomas Abraham
2014-09-01 22:29 ` Mike Turquette
2014-09-02 13:53 ` Thomas Abraham
2014-07-30 8:07 ` [PATCH v9 2/6] clk: samsung: add cpu clock configuration data and instantiate cpu clock Thomas Abraham
2014-09-01 22:29 ` Mike Turquette
2014-07-30 8:07 ` [PATCH v9 3/6] ARM: dts: Exynos: add CPU OPP and regulator supply property Thomas Abraham
2014-07-30 11:28 ` Andreas Färber
2014-07-31 2:55 ` Thomas Abraham
2014-07-31 0:37 ` Doug Anderson
2014-07-31 3:21 ` Thomas Abraham
2014-07-31 3:53 ` Doug Anderson
2014-07-31 4:06 ` Thomas Abraham
2014-07-31 4:08 ` Doug Anderson
2014-07-31 4:18 ` Thomas Abraham
2014-08-02 3:49 ` Javier Martinez Canillas
2014-08-04 3:00 ` Thomas Abraham
2014-07-30 8:07 ` [PATCH v9 4/6] ARM: Exynos: switch to using generic cpufreq driver for Exynos4210/5250/5420 Thomas Abraham
2014-07-31 18:32 ` Kukjin Kim
2014-07-31 18:40 ` Tomasz Figa
2014-07-31 18:54 ` Tomasz Figa
2014-07-31 19:25 ` Thomas Abraham
2014-07-31 19:30 ` Tomasz Figa
2014-08-04 3:24 ` Thomas Abraham
2014-08-22 23:54 ` Kevin Hilman
2014-08-23 0:02 ` Tomasz Figa
2014-08-25 6:53 ` Lukasz Majewski
2014-08-25 12:15 ` Chander Kashyap
2014-08-25 15:32 ` Kevin Hilman
2014-08-25 15:56 ` Tomasz Figa
2014-08-26 4:54 ` Viresh Kumar
2014-08-26 5:25 ` Chander Kashyap
2014-08-26 15:15 ` Kevin Hilman
2014-08-26 22:25 ` Kevin Hilman
2014-08-29 12:52 ` Thomas Abraham [this message]
2014-08-29 15:03 ` Kevin Hilman
2014-09-01 8:47 ` Thomas Abraham
2014-09-02 19:32 ` Kevin Hilman
2014-09-03 4:26 ` Thomas Abraham
2014-09-03 13:18 ` Thomas Abraham
2014-09-03 23:15 ` Kevin Hilman
2014-09-04 10:22 ` Thomas Abraham
2014-09-04 13:30 ` Kevin Hilman
2014-09-05 13:41 ` Thomas Abraham
2014-08-25 8:11 ` Sjoerd Simons
2014-07-30 8:07 ` [PATCH v9 5/6] cpufreq: exynos: remove exynos4210/5250 specific cpufreq driver support Thomas Abraham
2014-07-30 8:07 ` [PATCH v9 6/6] clk: samsung: remove unused clock aliases and update clock flags Thomas Abraham
2014-07-31 14:13 ` Tomasz Figa
2014-07-31 18:24 ` Thomas Abraham
2014-07-31 18:35 ` Tomasz Figa
2014-07-31 18:41 ` Thomas Abraham
2014-07-31 18:46 ` Tomasz Figa
2014-07-31 18:49 ` Thomas Abraham
2014-09-01 22:31 ` Mike Turquette
2014-07-31 6:20 ` [PATCH v9 0/6] cpufreq: use generic cpufreq drivers for exynos platforms Chander M. Kashyap
2014-07-31 10:59 ` Thomas Abraham
2014-07-31 12:24 ` Chander M. Kashyap
2014-07-31 14:15 ` Tomasz Figa
2014-07-31 18:25 ` Thomas Abraham
2014-07-31 18:34 ` Thomas Abraham
2014-08-01 9:42 ` Viresh Kumar
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