i2cdetect scanned i2c bus very slow if address was not occupied by any device.
Signed-off-by: Janusz Uzycki <j.uzycki@xxxxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-mxs.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/i2c/busses/i2c-mxs.c b/drivers/i2c/busses/i2c-mxs.c
index 87ee72d..35ae448 100644
--- a/drivers/i2c/busses/i2c-mxs.c
+++ b/drivers/i2c/busses/i2c-mxs.c
@@ -307,6 +307,10 @@ 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) {
+ 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
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