linux-kernel - Re: [PATCH v2] ARM: dts: imx6sx-sdb: Remove OPP override

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Message-ID: <20170512003354.GA8471@dragon>
Date:   Fri, 12 May 2017 08:33:55 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Leonard Crestez <leonard.crestez@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Sascha Hauer <kernel@...gutronix.de>,
        Anson Huang <Anson.Huang@....com>,
        Robin Gong <yibin.gong@....com>,
        Peter Chen <peter.chen@....com>,
        Fabio Estevam <fabio.estevam@....com>,
        Henri Roosen <henri.roosen@...zinger.com>,
        Marek Vasut <marex@...x.de>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2] ARM: dts: imx6sx-sdb: Remove OPP override

On Fri, May 05, 2017 at 02:00:17PM +0300, Leonard Crestez wrote:
> The board file for imx6sx-sdb 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 only applies to LDO bypass mode, a feature not present in upstream.
> When LDOs are enabled the effect is to use higher voltages than necessary
> 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 only
> happen on board rev. C, rev. B is reported to still work.
> 
> Signed-off-by: Leonard Crestez <leonard.crestez@....com>
> CC: stable@...r.kernel.org

Applied, thanks.