Hi Leonard, On Tue, Apr 25, 2017 at 1:57 PM, Leonard Crestez <[email protected]> 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 <[email protected]> > > --- > 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
