i2c-mpc: Don't disable I2C module on stop condition
Disabling module on stop doesn't work on some CPUs (ie. mpc8241,
as reported by Guennadi Liakhovetski), so remove that.
Disable I2C module on errors/interrupts to prevent it from
locking up on mpc5200b.
Signed-off-by: Domen Puncer <domen.puncer@telargo.com>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index f7a81e9..d8de4ac 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -105,6 +105,7 @@
schedule();
if (time_after(jiffies, orig_jiffies + timeout)) {
pr_debug("I2C: timeout\n");
+ writeccr(i2c, 0);
result = -EIO;
break;
}
@@ -116,10 +117,12 @@
result = wait_event_interruptible_timeout(i2c->queue,
(i2c->interrupt & CSR_MIF), timeout * HZ);
- if (unlikely(result < 0))
+ if (unlikely(result < 0)) {
pr_debug("I2C: wait interrupted\n");
- else if (unlikely(!(i2c->interrupt & CSR_MIF))) {
+ writeccr(i2c, 0);
+ } else if (unlikely(!(i2c->interrupt & CSR_MIF))) {
pr_debug("I2C: wait timeout\n");
+ writeccr(i2c, 0);
result = -ETIMEDOUT;
}
@@ -172,7 +175,6 @@
static void mpc_i2c_stop(struct mpc_i2c *i2c)
{
writeccr(i2c, CCR_MEN);
- writeccr(i2c, 0);
}
static int mpc_write(struct mpc_i2c *i2c, int target,
@@ -261,6 +263,7 @@
while (readb(i2c->base + MPC_I2C_SR) & CSR_MBB) {
if (signal_pending(current)) {
pr_debug("I2C: Interrupted\n");
+ writeccr(i2c, 0);
return -EINTR;
}
if (time_after(jiffies, orig_jiffies + HZ)) {