Martin Povišer a5f36e13b5 i2c: pasemi: Wait for write xfers to finish ... commit bd8963e602 upstream. Wait for completion of write transfers before returning from the driver. At first sight it may seem advantageous to leave write transfers queued for the controller to carry out on its own time, but there's a couple of issues with it: * Driver doesn't check for FIFO space. * The queued writes can complete while the driver is in its I2C read transfer path which means it will get confused by the raising of XEN (the 'transaction ended' signal). This can cause a spurious ENODATA error due to premature reading of the MRXFIFO register. Adding the wait fixes some unreliability issues with the driver. There's some efficiency cost to it (especially with pasemi_smb_waitready doing its polling), but that will be alleviated once the driver receives interrupt support. Fixes: beb58aa39e ("i2c: PA Semi SMBus driver") Signed-off-by: Martin Povišer <povik+lin@cutebit.org> Reviewed-by: Sven Peter <sven@svenpeter.dev> Signed-off-by: Wolfram Sang <wsa@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-04-20 09:36:27 +02:00
..
algos	i2c: algo: bit: use new macro to specifiy capabilities	2021-01-22 09:59:21 +01:00
busses	i2c: pasemi: Wait for write xfers to finish	2022-04-20 09:36:27 +02:00
muxes	i2c: mux: demux-pinctrl: do not deactivate a master that is not active	2022-04-08 13:58:21 +02:00
i2c-boardinfo.c	i2c: Remove support for dangling device properties	2021-04-10 21:43:02 +02:00
i2c-core-acpi.c	ACPI updates for 5.17-rc1	2022-01-10 20:26:56 -08:00
i2c-core-base.c	Merge branch 'i2c/for-mergewindow' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux	2022-01-14 16:19:38 +01:00
i2c-core-of.c
i2c-core-slave.c	i2c: slave: add sanity check when unregistering	2020-07-28 18:37:17 +02:00
i2c-core-smbus.c	i2c: core-smbus: Expose PEC calculate function for generic use	2021-06-25 17:09:34 +02:00
i2c-core.h	i2c: acpi: Remove dead code, i.e. i2c_acpi_match_device()	2020-08-25 09:22:09 +02:00
i2c-dev.c	i2c: dev: check return value when calling dev_set_name()	2022-04-20 09:36:27 +02:00
i2c-mux.c
i2c-slave-eeprom.c	i2c: busses: Use fallthrough pseudo-keyword	2020-07-23 22:04:08 +02:00
i2c-slave-testunit.c	i2c: testunit: add support for block process calls	2021-02-12 11:11:04 +01:00
i2c-smbus.c	i2c: smbus: add core function handling SMBus host-notify	2020-09-09 10:38:28 +02:00
i2c-stub.c	i2c: stub: remove definition of DEBUG	2021-01-17 13:00:10 +01:00
Kconfig	i2c: add slave testunit driver	2020-09-21 11:02:17 +02:00
Makefile	i2c: add slave testunit driver	2020-09-21 11:02:17 +02:00