[PATCH] [RFC] ARM: dts: imx6sx-sdb: Drop OPP hackery

[Leonard Crestez]

On Tue, 2017-04-25 at 22:39 +0300, Leonard Crestez wrote:
> On Tue, 2017-04-25 at 21:30 +0200, Marek Vasut wrote:
> > 
> > On 04/25/2017 06:42 PM, Marek Vasut wrote:
> > > 
> > > The imx6sx-sdb has one power supply that drives both VDDARM_IN
> > > and VDDSOC_IN, which is the sw1a regulator on the PFUZE PMIC.
> > > Connect both inputs to the sw1a regulator on the PMIC and drop
> > > the OPP hackery which is no longer needed as the power framework
> > > will take care of the regulator configuration as needed.
> > > 
> > > Signed-off-by: Marek Vasut <marex at denx.de>
> > > Cc: Fabio Estevam <fabio.estevam at nxp.com>
> > > Cc: Shawn Guo <shawnguo at kernel.org>
> > +CC Leonard
> Tested-by: Leonard Crestez <leonard.crestez at nxp.com>
> 
> The OPP hack only applies to LDO bypass mode and that is not 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 (for example Rev B)
> fail to boot with ugly semi-random crashes reminiscent of memory
> corruption. These failures happen the first time the lowest idle state
> is used. This patch fixes those crashes.
> 
> It's not clear exactly why the crashes happen. Perhaps waking up from
> idle draws more power than is available? I don't think it matters.
> 
> I sent a very similar patch a few minutes after this one:
> 
> http://lists.infradead.org/pipermail/linux-arm-kernel/2017-April/503241
> .html

Adding Henri Roosen because he reported something very similar.

Henri: Can you please check if this patch fixes your issue?

-- 
Regards,
Leonard