[PATCH dev-5.2 0/2] i2c: aspeed: Add H/W timeout support

[Jae Hyun Yoo]

On 9/4/2019 5:10 PM, Andrew Jeffery wrote:
> 
> 
> On Thu, 5 Sep 2019, at 09:10, Jae Hyun Yoo wrote:
>> Hi Andrew,
>>
>> On 9/4/2019 4:12 PM, Andrew Jeffery wrote:
>>> On Thu, 5 Sep 2019, at 08:31, Jae Hyun Yoo wrote:
>>>> Hi Joel,
>>>>
>>>> On 9/4/2019 3:54 PM, Joel Stanley wrote:
>>>>> Hi Jae,
>>>>>
>>>>> On Wed, 4 Sep 2019 at 20:08, Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com> wrote:
>>>>>>
>>>>>> In case of multi-master environment, if a peer master incorrectly handles
>>>>>> a bus in the middle of a transaction, I2C hardware hangs in slave state
>>>>>> and it can't escape from the slave state, so this commit adds slave
>>>>>> inactive timeout support to recover the bus in the case.
>>>>>>
>>>>>> By applying this change, SDA data-low and SCL clock-low timeout feature
>>>>>> also could be enabled which was disabled previously.
>>>>>
>>>>> Please consider sending your RFC patches to the upstream list. You
>>>>> have a big backlog of patches now.
>>>>
>>>> Thanks for the reminding. I can't send the RFC patches yet because QEMU
>>>> H/W model isn't ready yet. I'm still waiting for the fix from Cedric.
>>>
>>> QEMU shouldn't be preventing you from sending patches upstream, rather
>>> it prevents us from enabling the buffer mode support in the OpenBMC
>>> kernel tree. You should be sending all patches upstream as early as possible.
>>
>> I met a QEMU issue when I was upstreaming a patch set last year:
>> https://lists.ozlabs.org/pipermail/linux-aspeed/2018-September/000750.html
>>
>> If OpenBMC community accepts the QEMU issue, I can submit the RFC
>> patches to upstream. Will submit the patch set soon to linux tree.
> 
> Ah, didn't realise it was Guenter that ran into it. We have some changes[1] in
> Cedric's aspeed-4.2 qemu tree - do you mind testing it out? If those patches
> resolve the issue Maybe we could point Guenter at that tree, though really we
> should get the fixes upstream so this isn't an issue.
> 
> [1] https://github.com/legoater/qemu/compare/59dda66ab756e52e6a9c1ef89660d30b3769f63c...aspeed-4.2
> 

Okay. I'll give it a try.

Thanks,
Jae