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| author | Jean Delvare <khali@linux-fr.org> | 2010-03-02 12:23:41 +0100 |
|---|---|---|
| committer | Jean Delvare <khali@linux-fr.org> | 2010-03-02 12:23:41 +0100 |
| commit | 6d376fcc28d98f7f8f652755ae4dca1ff7240563 (patch) | |
| tree | f238f98bbbf2fb3e2f270571404d3c9a91c5281a | |
| parent | i2c-tiny-usb: Fix a comment on bus frequency (diff) | |
| download | linux-6d376fcc28d98f7f8f652755ae4dca1ff7240563.tar.xz linux-6d376fcc28d98f7f8f652755ae4dca1ff7240563.zip | |
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 <khali@linux-fr.org>
| -rw-r--r-- | drivers/i2c/busses/i2c-parport-light.c | 6 | ||||
| -rw-r--r-- | 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 322c5691e38e..5383f64c5372 100644 --- a/drivers/i2c/busses/i2c-parport-light.c +++ b/drivers/i2c/busses/i2c-parport-light.c @@ -27,6 +27,7 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> +#include <linux/delay.h> #include <linux/platform_device.h> #include <linux/ioport.h> #include <linux/i2c.h> @@ -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 0d8998610c74..056af1820993 100644 --- a/drivers/i2c/busses/i2c-parport.c +++ b/drivers/i2c/busses/i2c-parport.c @@ -27,6 +27,7 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> +#include <linux/delay.h> #include <linux/parport.h> #include <linux/i2c.h> #include <linux/i2c-algo-bit.h> @@ -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"); |