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Message-ID: <a6e5b123-91da-b32d-be40-d88a82e4374e@linux.intel.com>
Date:   Mon, 15 Aug 2022 14:17:53 +0300
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Subject: Re: [PATCH v2] i2c: designware: Introduce semaphore reservation timer
 to AMDPSP driver
To:     Jan Dabros <jsd@semihalf.com>, linux-kernel@vger.kernel.org,
        linux-i2c@vger.kernel.org, andriy.shevchenko@linux.intel.com
Cc:     mika.westerberg@linux.intel.com, rrangel@chromium.org,
        mw@semihalf.com, upstream@semihalf.com
References: <20220812071526.414285-1-jsd@semihalf.com>
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From:   Jarkko Nikula <jarkko.nikula@linux.intel.com>
In-Reply-To: <20220812071526.414285-1-jsd@semihalf.com>
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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@semihalf.com>
> ---
>   drivers/i2c/busses/i2c-designware-amdpsp.c | 68 +++++++++++++++++-----
>   1 file changed, 53 insertions(+), 15 deletions(-)
> 
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>