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@xxxxxxxxxxxxxx>
---
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
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