[Skiboot] [PATCH] hw/phb4: Prevent register accesses when in reset

[Vasant Hegde]

On 08/02/2019 01:30 PM, Oliver O'Halloran wrote:
> While the the ETU is in reset we cannot access any of the PHB registers.
> If a PHB register is accessed via the XSCOM indirect interface then
> we'll cause an ETU reset error which may prevent the PHB from being
> re-initialised once the reset is lifted.
> 
> Prevent register accesses while in reset by adding a flag that is set
> while the ETU reset bit is high and checking that flag in the XSCOM
> (ASB) backdoor register access path.

Candidate for #stable ?

-Vasant