[Skiboot] [PATCH v2 7/7] npu2-opencapi: Fix adapter reset when using 2 adapters

[christophe lombard]

On 12/03/2019 21:35, Frederic Barrat wrote:
> If two opencapi adapters are on the same obus, we may try to train the
> two links in parallel at boot time, when all the PCI links are being
> trained. Both links use the same i2c controller to handle the reset
> signal, so some care is needed to make sure resetting one doesn't
> interfere with the reset of the other. We need to keep track of the
> current state of the i2c controller (and use locking).
> 
> This went mostly unnoticed as you need to have 2 opencapi cards on the
> same socket and links tended to train anyway because of the retries.
> 
> Signed-off-by: Frederic Barrat <fbarrat at linux.ibm.com>
> Reviewed-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>
> ---
> 
> v2: no change
> 
>   hw/npu2-common.c   |  3 +++
>   hw/npu2-opencapi.c | 34 +++++++++++++++++++++++++++-------
>   include/npu2.h     |  4 ++++
>   3 files changed, 34 insertions(+), 7 deletions(-)
> 

Reviewed-by: Christophe Lombard <clombard at linux.vnet.ibm.com>