Messages in this thread | | | From | Fabio Estevam <> | Date | Tue, 25 Apr 2017 14:02:51 -0300 | Subject | Re: [PATCH] ARM: dts: imx6sx-sdb: Remove cpufreq OPP override |
| |
On Tue, Apr 25, 2017 at 2:02 PM, Fabio Estevam <festevam@gmail.com> wrote: > 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
Forgot to add Marek.
| |