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authorJarkko Nikula <jarkko.nikula@linux.intel.com>2017-08-15 17:34:45 +0300
committerWolfram Sang <wsa@the-dreams.de>2017-08-17 18:55:29 +0300
commit2a86cdd2e7d3c75580f41f89f9b9211e225573cc (patch)
tree94351b93ccf3d23512788566d27739dde6a1cd3f /drivers/i2c
parent733f6563979d96dec180c350abb8ac67cc0367ba (diff)
downloadlinux-2a86cdd2e7d3c75580f41f89f9b9211e225573cc.tar.xz
i2c: designware: Fix runtime PM for I2C slave mode
I2C slave controller must be powered and active all the time when I2C slave backend is registered in order to let master address and communicate with us. Now if the controller is runtime PM capable it will be suspended after probe and cannot ever respond to the master or generate interrupts. Fix this by resuming the controller when I2C slave backend is registered and let it suspend after unregistering. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-designware-slave.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-designware-slave.c b/drivers/i2c/busses/i2c-designware-slave.c
index 25fa33927124..78d8fb73927d 100644
--- a/drivers/i2c/busses/i2c-designware-slave.c
+++ b/drivers/i2c/busses/i2c-designware-slave.c
@@ -177,6 +177,8 @@ static int i2c_dw_reg_slave(struct i2c_client *slave)
return -EBUSY;
if (slave->flags & I2C_CLIENT_TEN)
return -EAFNOSUPPORT;
+ pm_runtime_get_sync(dev->dev);
+
/*
* Set slave address in the IC_SAR register,
* the address to which the DW_apb_i2c responds.
@@ -205,6 +207,7 @@ static int i2c_dw_unreg_slave(struct i2c_client *slave)
dev->disable_int(dev);
dev->disable(dev);
dev->slave = NULL;
+ pm_runtime_put(dev->dev);
return 0;
}