Re: [PATCH i2c-next v7 5/5] i2c: aspeed: Add bus idle waiting logic for multi-master use cases

Brendan Higgins
2018-10-10T00:08:14Z

On Fri, Oct 5, 2018 at 2:45 PM Jae Hyun Yoo
<jae.hyun.yoo@linux.intel.com> wrote:
>
> In multi-master environment, this driver's master cannot know
> exactly when peer master sends data to this driver's slave so a
> case can be happened that this master tries to send data through
> the master_xfer function but slave data from peer master is still
> being processed by this driver.
>
> To prevent any state corruption in the case, this patch adds
> checking code if any slave operation is ongoing and it waits up to
> the bus timeout duration before starting a master_xfer operation.
>
> Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>

Reviewed-by: Brendan Higgins <brendanhiggins@google.com>