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| author | Janusz Użycki <j.uzycki@elproma.com.pl> | 2014-09-23 12:48:26 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2014-10-03 03:35:49 +0200 |
| commit | 030f940a535433605e6b4ee43f36189e5cace022 (patch) | |
| tree | 21e7c18dcf261cdd186875fca17571047b060912 /drivers/i2c | |
| parent | d8e0a86f9713689e35dc14f7184e85a13a2a9f4e (diff) | |
| download | linux-rpi-030f940a535433605e6b4ee43f36189e5cace022.tar.gz linux-rpi-030f940a535433605e6b4ee43f36189e5cace022.tar.bz2 linux-rpi-030f940a535433605e6b4ee43f36189e5cace022.zip | |
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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-mxs.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-mxs.c b/drivers/i2c/busses/i2c-mxs.c index 65a21fed08b5..07e1be6f8992 100644 --- a/drivers/i2c/busses/i2c-mxs.c +++ b/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) { + 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(); |