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

From: Jarkko Nikula
Date: Mon Aug 15 2022 - 07:18:02 EST


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@xxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-designware-amdpsp.c | 68 +++++++++++++++++-----
1 file changed, 53 insertions(+), 15 deletions(-)

Acked-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>