linux-kernel - Re: [PATCH v2] i2c: designware: Introduce semaphore reservation timer to AMDPSP driver

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Message-ID: <CAOtMz3Nt15089MrvKAzgoviY1P4B=5v08c5-8qt3=f7RhPb8BA@mail.gmail.com>
Date:   Mon, 22 Aug 2022 12:31:30 +0200
From:   Jan Dąbroś <jsd@...ihalf.com>
To:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        andriy.shevchenko@...ux.intel.com, mika.westerberg@...ux.intel.com,
        rrangel@...omium.org, mw@...ihalf.com, upstream@...ihalf.com
Subject: Re: [PATCH v2] i2c: designware: Introduce semaphore reservation timer
 to AMDPSP driver

pon., 15 sie 2022 o 13:17 Jarkko Nikula
<jarkko.nikula@...ux.intel.com> napisał(a):
>
> On 8/12/22 10:15, Jan Dabros wrote:
> > In order to optimize performance, limit amount of back and forth
> > transactions between x86 and PSP. This is done by introduction of
> > semaphore reservation period - that is window in which x86 isn't
> > releasing the bus immediately after each I2C transaction.
> >
> > In order to protect PSP from being starved while waiting for
> > arbitration, after a programmed time bus is automatically released by a
> > deferred function.
> >
> > Signed-off-by: Jan Dabros <jsd@...ihalf.com>
> > ---
> >   drivers/i2c/busses/i2c-designware-amdpsp.c | 68 +++++++++++++++++-----
> >   1 file changed, 53 insertions(+), 15 deletions(-)
> >
> Acked-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>

Thanks!

Best Regards,
Jan