[Skiboot] [PATCH-RESEND] phb4: Reset FIR/NFIR registers before PHB4 probe

[Vaibhav Jain]

Thanks looking into this patch Mikey,

Michael Neuling <mikey at neuling.org> writes:
>> >  hw/phb4.c | 9 +++++++++
>> >  1 file changed, 9 insertions(+)
>> > 
>> > diff --git a/hw/phb4.c b/hw/phb4.c
>> > index e45be01f..c5a33a0f 100644
>> > --- a/hw/phb4.c
>> > +++ b/hw/phb4.c
>> > @@ -5315,6 +5315,15 @@ static void phb4_probe_stack(struct dt_nod
>
> Can we put this in phb4_init_hw() instead or is that too late?

Its too late to put this in phb4_init_hw() as phb4_probe_stack() will do
the first test mmio to read the PHB version register. This is done just
after resetting the ETU. Without this change the PHB version was being
reported as 0xffffffffffffffff.

>
>> > *stk_node, uint32_t pec_index,
>> >  		return;
>> >  	}
>> >  
>> > +	/* Clear errors in PFIR and NFIR */
>> > +	xscom_read(gcid, pci_stack + XPEC_PCI_STK_PCI_FIR, &val);
>> > +	prlog_once(PR_DEBUG, "PFIR: %llx\n", val);
>
> Can we removed these reads and prints.  I'm not sure they add any value.

Agreed they dont add much value. Was trying to follow the same
convention to dump ETU reset register before its being overwritten. Will
send a v2 with these debug prints removed.

-- 
Vaibhav Jain <vaibhav at linux.vnet.ibm.com>
Linux Technology Center, IBM India Pvt. Ltd.