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f5e596cd9f
linux/drivers/i2c
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Jisheng Zhang f5e596cd9f i2c: pca954x: put the mux to disconnected state after resume 
pca954x may be power lost during suspend, so after resume we also suffer
the issue fixed by commit cd823db8b1,

 "pca954x power-on default is channel 0 connected. If multiple pca954x
 muxes are connected to the same physical I2C bus, the parent bus will
 see channel 0 devices behind both muxes by default."

What's more, when resume bootloader may also operate the mux, so the
the channel connected after that may not be the one driver thought.

We fix this problem by putting the mux to disconnected state and
clearing last_chan in the resume hook.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014-08-01 19:54:59 +02:00
..
algos Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2014-01-29 19:56:20 -08:00
busses i2c: st: Update i2c timings 2014-08-01 19:47:17 +02:00
muxes i2c: pca954x: put the mux to disconnected state after resume 2014-08-01 19:54:59 +02:00
i2c-acpi.c I2C/ACPI: Clean up I2C ACPI code and Add CONFIG_I2C_ACPI config 2014-06-27 14:50:41 +02:00
i2c-boardinfo.c i2c: Update the FSF address 2012-03-26 21:47:19 +02:00
i2c-core.c i2c: add debug info when class instantiation was dropped 2014-07-16 22:59:55 +02:00
i2c-core.h i2c: Update the FSF address 2012-03-26 21:47:19 +02:00
i2c-dev.c i2c: i2c-dev: Create 'name' attribute automatically 2013-09-30 06:02:31 +02:00
i2c-mux.c i2c: mux: Inherit retry count and timeout from parent for muxed bus 2013-12-12 22:39:28 +01:00
i2c-smbus.c Update Jean Delvare's e-mail address 2014-01-29 20:40:08 +01:00
i2c-stub.c i2c: stub: Avoid an array overrun on I2C block transfers 2014-07-20 13:25:29 +02:00
Kconfig I2C/ACPI: Clean up I2C ACPI code and Add CONFIG_I2C_ACPI config 2014-06-27 14:50:41 +02:00
Makefile I2C/ACPI: Clean up I2C ACPI code and Add CONFIG_I2C_ACPI config 2014-06-27 14:50:41 +02:00