From 6d376fcc28d98f7f8f652755ae4dca1ff7240563 Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Tue, 2 Mar 2010 12:23:41 +0100 Subject: [PATCH] i2c-parport: Give powered devices some time to settle When the i2c-parport adapter is reponsible for powering devices, it would seem reasonable to give them some time to settle before trying to access them. Signed-off-by: Jean Delvare --- drivers/i2c/busses/i2c-parport-light.c | 6 +++++- drivers/i2c/busses/i2c-parport.c | 6 +++++- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/busses/i2c-parport-light.c b/drivers/i2c/busses/i2c-parport-light.c index 322c569..5383f64 100644 --- a/drivers/i2c/busses/i2c-parport-light.c +++ b/drivers/i2c/busses/i2c-parport-light.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -127,8 +128,11 @@ static int __devinit i2c_parport_probe(struct platform_device *pdev) parport_setsda(NULL, 1); parport_setscl(NULL, 1); /* Other init if needed (power on...) */ - if (adapter_parm[type].init.val) + if (adapter_parm[type].init.val) { line_set(1, &adapter_parm[type].init); + /* Give powered devices some time to settle */ + msleep(100); + } parport_adapter.dev.parent = &pdev->dev; err = i2c_bit_add_bus(&parport_adapter); diff --git a/drivers/i2c/busses/i2c-parport.c b/drivers/i2c/busses/i2c-parport.c index 0d89986..056af18 100644 --- a/drivers/i2c/busses/i2c-parport.c +++ b/drivers/i2c/busses/i2c-parport.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -185,8 +186,11 @@ static void i2c_parport_attach (struct parport *port) parport_setsda(port, 1); parport_setscl(port, 1); /* Other init if needed (power on...) */ - if (adapter_parm[type].init.val) + if (adapter_parm[type].init.val) { line_set(port, 1, &adapter_parm[type].init); + /* Give powered devices some time to settle */ + msleep(100); + } if (i2c_bit_add_bus(&adapter->adapter) < 0) { printk(KERN_ERR "i2c-parport: Unable to register with I2C\n"); -- 2.7.4