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Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override

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Hi Leonard,

On Tue, Apr 25, 2017 at 1:57 PM, Leonard Crestez
<leonard.crestez@nxp.com> wrote:
> The board file for imx6sx-dbg overrides cpufreq operating points to use
> higher voltages. This is done because the board has a shared rail for
> VDD_ARM_IN and VDD_SOC_IN and when using LDO bypass the shared voltage
> needs to be a value suitable for both ARM and SOC.
>
> This was introduced in:
>
> commit 54183bd7f766 ("ARM: imx6sx-sdb: add revb board and make it default")
>
> This only only applies to LDO bypass mode, a feature not present in
> upstream. When LDOs are enabled the effect is to use higher voltages than
> necesarry for no good reason.
>
> Setting these higher voltages can make some boards fail to boot with ugly
> semi-random crashes, reminiscent of memory corruption. These failures
> happen the first time the lowest idle state is used. Remove the OPP
> override in order to fix those crashes.
>
> Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
>
> ---
> It's not clear exactly why the crashes happen. Perhaps waking up from idle
> draws more power than is available? Removing this override is a correct
> change anyway so maybe there is no need to investigate deeper.

Marek just sent a similar one a few minutes ago:
http://lists.infradead.org/pipermail/linux-arm-kernel/2017-April/503230.html

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Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Fabio Estevam <festevam@gmail.com> - 2017-04-25 19:10 +0200
  Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Fabio Estevam <festevam@gmail.com> - 2017-04-25 19:10 +0200
    Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Fabio Estevam <festevam@gmail.com> - 2017-04-25 19:30 +0200
    Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Marek Vasut <marex@denx.de> - 2017-04-25 19:30 +0200
      Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Shawn Guo <shawnguo@kernel.org> - 2017-05-03 16:00 +0200
        Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Marek Vasut <marex@denx.de> - 2017-05-03 16:30 +0200
          Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Marek Vasut <marex@denx.de> - 2017-05-03 16:40 +0200
            Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Shawn Guo <shawnguo@kernel.org> - 2017-05-03 16:50 +0200
              Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Marek Vasut <marex@denx.de> - 2017-05-03 17:00 +0200
          Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Marek Vasut <marex@denx.de> - 2017-05-03 18:00 +0200
            Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Marek Vasut <marex@denx.de> - 2017-05-03 21:50 +0200
              Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Marek Vasut <marex@denx.de> - 2017-05-04 12:10 +0200
                Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Shawn Guo <shawnguo@kernel.org> - 2017-05-04 14:50 +0200
                Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Marek Vasut <marex@denx.de> - 2017-05-04 15:10 +0200
                Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Shawn Guo <shawnguo@kernel.org> - 2017-05-04 15:50 +0200
                Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Marek Vasut <marex@denx.de> - 2017-05-04 17:20 +0200
                Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override Shawn Guo <shawnguo@kernel.org> - 2017-05-05 03:20 +0200

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