On Monday, September 08, 2014 at 08:06:12 PM, Janusz Użycki wrote:
> 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.
Shouldn't this check be used only after the 'SELECT' command ?
> 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
Best regards,
Marek Vasut
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