fsi: gpio: Use a mutex to protect transfers

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Reduce time spent with interrupts disabled by limiting the critical
sections to bitbanging FSI symbols. We only need to ensure exclusive use
of the bus for an entire transfer, not that the transfer be performed in
atomic context.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Tested-by: Joel Stanley <joel@jms.id.au>

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Jeremy Kerr 2018-02-20 14:48:44 +10:30 • committed by Benjamin Herrenschmidt

parent e212ab47bd

commit e5538139e0

1 changed files with 64 additions and 22 deletions

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drivers/fsi/fsi-master-gpio.c

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