From 6d376fcc28d98f7f8f652755ae4dca1ff7240563 Mon Sep 17 00:00:00 2001
From: Jean Delvare <khali@linux-fr.org>
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 <khali@linux-fr.org>
---
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 322c5691e38eb7..5383f64c53729a 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 0d8998610c740e..056af18209933c 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");
--
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