i2c: designware: Introduce semaphore reservation timer to AMDPSP driver

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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>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
[wsa: removed an unneeded empty line]
Signed-off-by: Wolfram Sang <wsa@kernel.org>

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Jan Dabros 2022-08-12 09:15:26 +02:00 • committed by Wolfram Sang

parent ed5c2f5fd1

commit 786f01d205

1 changed files with 52 additions and 15 deletions

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drivers/i2c/busses/i2c-designware-amdpsp.c

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