[Skiboot] [PATCH 5/7] hw/phb3: Disable ECRC on Broadcom adapter behind PMC switch

[Gavin Shan]

On Tue, Oct 11, 2016 at 03:09:53PM +1100, Stewart Smith wrote:
>Gavin Shan <gwshan at linux.vnet.ibm.com> writes:
>> The ECRC generation and check can't be enabled on Broadcom's NIC
>> (14e4:168a) when it seats behind PMC PCIe switch downstream port
>> (11f8:8546). Otherwise, the NIC's config space can not be accessed
>> and returns 0xFF's on read because of EEH error even after the error
>> is cleared. The issue is reported from Firestone.
>>
>> This disables ECRC generation and check on Broadcom's NIC when it
>> seats behind PMC PCIe switch downstream port. With this applied,
>> the NIC can be detected successfully.
>>
>> Reported-by: Li Meng <shlimeng at cn.ibm.com>
>> Signed-off-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
>
>Should this also go to stable?
>

I don't think it needn't go stable necessarily as the PMC switch isn't
a intergarted one. So the issue was found on customized board, not a
standard (or official) one.

Thanks,
Gavin