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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>
This commit is contained in:
Jean Delvare 2010-03-02 12:23:41 +01:00
parent c05d490234
commit 6d376fcc28
2 changed files with 10 additions and 2 deletions
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6
drivers/i2c/busses/i2c-parport-light.c
View File

@ -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);

6
drivers/i2c/busses/i2c-parport.c
View File

@ -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");