No need to continue waiting if arbitration lost.
Signed-off-by: Troy Kisky <troy.ki...@boundarydevices.com>
Acked-by: Marek Vasut <ma...@denx.de>
---
v2: add ack
---
drivers/i2c/mxc_i2c.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
index ba2aad3..093a73f 100644
--- a/drivers/i2c/mxc_i2c.c
+++ b/drivers/i2c/mxc_i2c.c
@@ -55,6 +55,7 @@ struct mxc_i2c_regs {
#define I2SR_ICF (1 << 7)
#define I2SR_IBB (1 << 5)
+#define I2SR_IAL (1 << 4)
#define I2SR_IIF (1 << 1)
#define I2SR_RX_NO_AK (1 << 0)
@@ -165,6 +166,12 @@ static int wait_for_sr_state(struct mxc_i2c_regs
*i2c_regs, unsigned state)
ulong start_time = get_timer(0);
for (;;) {
sr = readb(&i2c_regs->i2sr);
+ if (sr & I2SR_IAL) {
+ writeb(sr & ~I2SR_IAL, &i2c_regs->i2sr);
+ printf("%s: Arbitration lost sr=%x cr=%x state=%x\n",
+ __func__, sr, readb(&i2c_regs->i2cr), state);
+ return -ERESTART;
+ }
if ((sr & (state >> 8)) == (unsigned char)state)
return sr;
WATCHDOG_RESET();
--
1.7.9.5
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