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SubjectRe: [PATCH v4 19/23] drivers/fsi: Add GPIO based FSI master
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On 4/4/17 5:19 PM, Benjamin Herrenschmidt wrote:
> On Tue, 2017-04-04 at 12:32 -0500, Christopher Bostic wrote:
>> Agreed that there is room for improvement. I intend to look further
>> into your suggestions from here and our private conversation on the
>> matter and make changes as appropriate. I have an open issue to track
>> this. As it exists in this patch reads/writes from master to slave
>> fundamentally work.
> My understanding is they "seem to work if you get lucky with the timing
> and fall apart under load". Or did I hear wrong ?
>
>> Given the pervasiveness and time to fully evaluate
>> and test any protocol updates I intend address this in the near future
>> with a separate follow on patch.
> Please try the simple change I proposed in my email. It's a 4 or 5
> lines change max to your clock_toggle function and how it's called in
> send and receive. It should be trivial to check if things still "seem
> to work" to begin with.
>
> Do you have some kind of test mechanism that hammers the FSI
> continuously ? Such as doing a series of putmemproc/getmemproc &
> checking the values ?
>
> Then you can run that while hammering the LPC bus and generally putting
> the BMC under load and you'll quickly see if it's reliable or not.

Hi Ben,

I do now have a mechanism that puts the bus under heavy load. I'll look
into your changes tomorrow.

Thanks,
Chris
>
> Cheers,
> Ben.
>

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