Commit 030f940a authored Sep 23, 2014 by Janusz Użycki Committed by Wolfram Sang Oct 03, 2014

i2c: mxs: detect No Slave Ack on SELECT in PIO mode



i2cdetect scanned i2c bus slow because the i2c-mxs driver ignored the
NO_SLAVE_ACK bit during busy-waiting loop. Thanks to the patch, the
speedup happens.

Signed-off-by: Janusz Uzycki <j.uzycki@elproma.com.pl>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

parent d8e0a86f

drivers/i2c/busses/i2c-mxs.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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) {
		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();