From: Viresh Kumar <viresh.kumar@linaro.org>
To: Leonard Crestez <leonard.crestez@nxp.com>
Cc: Mark Brown <broonie@kernel.org>,
Liam Girdwood <lgirdwood@gmail.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Shawn Guo <shawnguo@kernel.org>,
Sascha Hauer <kernel@pengutronix.de>,
Robin Gong <yibin.gong@nxp.com>,
Anson Huang <Anson.Huang@nxp.com>,
Irina Tirdea <irina.tirdea@nxp.com>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Fabio Estevam <fabio.estevam@nxp.com>,
Octavian Purdila <octavian.purdila@nxp.com>,
linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC 3/8] cpufreq: imx6q: Set max suspend_freq to avoid changes during suspend
Date: Thu, 23 Mar 2017 10:04:27 +0530 [thread overview]
Message-ID: <20170323043427.GE12094@vireshk-i7> (raw)
In-Reply-To: <f2126423e233757eb113f115e0be562ea0902a7a.1490199005.git.leonard.crestez@nxp.com>
On 22-03-17, 18:53, Leonard Crestez wrote:
> If the cpufreq driver tries to modify voltage/freq during suspend/resume
> it might need to control an external PMIC via I2C or SPI but those
> devices might be already suspended.
>
> To avoid this scenario we just increase cpufreq to highest setpoint
> before suspend. This issue can easily be triggered by ldo-bypass but in
> theory any regulator set_voltage call can end up having to modify
> external supply voltages.
>
> Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
> ---
> drivers/cpufreq/imx6q-cpufreq.c | 2 ++
> 1 file changed, 2 insertions(+)
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
--
viresh
next prev parent reply other threads:[~2017-03-23 4:34 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-22 16:53 [RFC 0/8] ARM: imx: Upstream fsl,ldo-bypass Leonard Crestez
2017-03-22 16:53 ` [RFC 1/8] ARM: imx: gpc: Do not print error message for EPROBE_DEFER Leonard Crestez
2017-03-22 16:53 ` [RFC 2/8] cpufreq: imx6q: Fix handling EPROBE_DEFER from regulator Leonard Crestez
[not found] ` <7f2618363d43b30db29f5f8ae822df413392f99d.1490199005.git.leonard.crestez-3arQi8VN3Tc@public.gmane.org>
2017-03-23 4:33 ` Viresh Kumar
2017-03-22 16:53 ` [RFC 3/8] cpufreq: imx6q: Set max suspend_freq to avoid changes during suspend Leonard Crestez
2017-03-23 4:34 ` Viresh Kumar [this message]
2017-03-28 20:03 ` Leonard Crestez
2017-03-28 20:50 ` Rafael J. Wysocki
2017-03-28 22:23 ` Rafael J. Wysocki
2017-03-22 16:53 ` [RFC 4/8] regulator: core: Check enabling bypass respects constraints Leonard Crestez
[not found] ` <1edff9bc610969b0c53fa1080d5db021c8e00b2d.1490199005.git.leonard.crestez-3arQi8VN3Tc@public.gmane.org>
2017-03-24 12:52 ` Mark Brown
2017-03-28 12:39 ` Leonard Crestez
[not found] ` <1490704781.3546.57.camel-3arQi8VN3Tc@public.gmane.org>
2017-03-28 16:47 ` Mark Brown
2017-03-28 19:49 ` Leonard Crestez
[not found] ` <1490730595.15830.1.camel-3arQi8VN3Tc@public.gmane.org>
2017-04-06 18:52 ` Mark Brown
[not found] ` <20170406185202.uixxcv3dgucrddgc-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2017-04-07 10:51 ` Leonard Crestez
2017-04-07 11:22 ` Mark Brown
[not found] ` <20170407112212.gzv3p7ldkh62657m-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2017-04-13 20:46 ` Leonard Crestez
2017-03-22 16:53 ` [RFC 5/8] regulator: anatop: fix min dropout for bypass mode Leonard Crestez
2017-03-24 12:54 ` Mark Brown
2017-03-28 11:52 ` Leonard Crestez
2017-03-22 16:53 ` [RFC 6/8] regulator: core: Add regulator_is_bypass function Leonard Crestez
[not found] ` <e74c2f4d2b452cbe01aa2a48edde5c024212ffcb.1490199005.git.leonard.crestez-3arQi8VN3Tc@public.gmane.org>
2017-03-24 12:55 ` Mark Brown
2017-03-28 14:53 ` Leonard Crestez
2017-03-22 16:53 ` [RFC 7/8] cpufreq: imx6q: Initialize LDO bypass Leonard Crestez
2017-03-22 17:09 ` Lucas Stach
[not found] ` <1490202585.29056.5.camel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2017-03-22 17:48 ` Leonard Crestez
2017-03-22 18:00 ` Lucas Stach
2017-03-22 16:53 ` [RFC 8/8] ARM: dts: imx6qdl-sabresd: Enable fsl,ldo-bypass Leonard Crestez
2017-03-22 17:13 ` Lucas Stach
[not found] ` <1490202830.29056.8.camel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2017-03-29 13:32 ` Leonard Crestez
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