The i2c driver contains a while loop that has no timeout. If i2c is in a
funky state and OMAP_I2C_CON_STT remains asserted, the kernel hangs. Insert
the standard i2c timeout into the loop.
Signed-off-by: Jason P Marini <jason.marini@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, w);
if (dev->b_hw && stop) {
+ unsigned long delay = jiffies + OMAP_I2C_TIMEOUT;
+
/* H/w behavior: dont write stt and stp together.. */
while (omap_i2c_read_reg(dev, OMAP_I2C_CON_REG) & OMAP_I2C_CON_STT) {
- /* Dont do anything - this will come in a couple of loops at max*/
+ /* Let the user know if i2c is in a bad state */
+ if (time_after (jiffies, delay)) {
+ dev_err(dev->dev, "controller timed out "
+ "waiting for start condition to finish\n");
+ return -ETIMEDOUT;
+ }
}
w |= OMAP_I2C_CON_STP;
w &= ~OMAP_I2C_CON_STT;