[PATCH 2/2] i2c-mxs: fixed PIO NACK error instead of timeout

["Janusz Użycki" <j.uzycki-9tnw74Q4ehaHKKo6LODCOg@public.gmane.org>]

Subject: [PATCH 2/2] i2c-mxs: fixed PIO NACK error instead of timeout
  (1000ms)

i2cdetect scanned i2c bus very slow if address was not occupied by any 
device.

Signed-off-by: Janusz Uzycki <j.uzycki-9tnw74Q4ehaHKKo6LODCOg@public.gmane.org>
---
  linux-3.14.17/drivers/i2c/busses/i2c-mxs.c | 3 +++
  1 file changed, 3 insertions(+)

diff --git a/linux-3.14.17/drivers/i2c/busses/i2c-mxs.c 
b/linux-3.14.17/drivers/i2c/busses/i2c-mxs.c
index 87ee72d..b498708 100644
--- a/linux-3.14.17/drivers/i2c/busses/i2c-mxs.c
+++ b/linux-3.14.17/drivers/i2c/busses/i2c-mxs.c
@@ -307,6 +307,9 @@ static int mxs_i2c_pio_wait_xfer_end(struct 
mxs_i2c_dev *i2c)
         unsigned long timeout = jiffies + msecs_to_jiffies(1000);

         while (readl(i2c->regs + MXS_I2C_CTRL0) & MXS_I2C_CTRL0_RUN) {
+               /*int ret = mxs_i2c_pio_check_error_state(i2c);*/
+               if (readl(i2c->regs + MXS_I2C_CTRL1) & 
MXS_I2C_CTRL1_NO_SLAVE_ACK_IRQ)
+                       return -ENXIO;
                 if (time_after(jiffies, timeout))
                         return -ETIMEDOUT;
                 cond_resched();
--
1.7.11.3