Re: [PATCH 1/8] mhi: pci-generic: Increase number of hardware events

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Hi Loic,

On 11/18/20 12:26 AM, Loic Poulain wrote:
On Wed, 18 Nov 2020 at 04:54, Hemant Kumar <hemantk@xxxxxxxxxxxxxx> wrote:

Hi Loic,

On 11/13/20 6:59 AM, Loic Poulain wrote:
If the IPA (IP hardware accelerator) is starved of event ring elements,
the modem is crashing (SDX55). That can be prevented by setting a
it is because of event processing is getting starved ?

Yes, and hardware does not like that.

Event ring elements = 2 x xfer ring is good for HW channels. Do you think NAPI
polling would help when you start verifying higher data rates?

That's a good question, I'll certainly test that. But we still need to
ensure this will
never ever happen with this higher event count.
Once you move to burst mode, if device is running out of credit, it would send OOB and move to doorbell mode, and stop posting events until
MHI Host rings DB with a TRE.


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