Re: [RFC 0/2] Add workaround for core wake-up on IPI for i.MX8MQ

From: Martin Kepplinger
Date: Wed Oct 30 2019 - 02:11:46 EST

On 23.06.19 13:47, Martin Kepplinger wrote:
> On 10.06.19 14:13, Abel Vesa wrote:
>> This is another alternative for the RFC:
>> This new workaround proposal is a little bit more hacky but more contained
>> since everything is done within the irq-imx-gpcv2 driver.
>> Basically, it 'hijacks' the registered gic_raise_softirq __smp_cross_call
>> handler and registers instead a wrapper which calls in the 'hijacked'
>> handler, after that calling into EL3 which will take care of the actual
>> wake up. This time, instead of expanding the PSCI ABI, we use a new vendor SIP.
>> I also have the patches ready for TF-A but I'll hold on to them until I see if
>> this has a chance of getting in.

Hi Abel,

Running this workaround doesn't seem to work anymore on 5.4-rcX. Linux
doesn't boot, with ATF unchanged (includes your workaround changes). I
can try to add more details to this...

Have you tested this for 5.4? Could you update this workaround? Please
let me know if I missed any earlier update on this (having a cpu-sleep
idle state).