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| author | Olof Johansson <olof@lixom.net> | 2012-05-10 00:21:11 -0700 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2012-05-10 00:23:17 -0700 |
| commit | caafc71b1a25096ef74904adb19d37e5c6a282dc (patch) | |
| tree | 17f0602c6e04fdec78c50a1c2cbd70a0303ed2c6 /drivers/i2c/busses/i2c-tegra.c | |
| parent | af568679f51de779d0e9ad7d8360dc7727da546d (diff) | |
| parent | bcd59b0f0c14b0584c1213ee3b53d5f84517c419 (diff) | |
Merge tag 'v3.5-soc' of git://gitorious.org/linux-davinci/linux-davinci into next/drivers
DaVinci SoC updates for v3.5
This pull request updates the DaVinci SoC support to implement DEBUG_LL port
choice and optimizes the DMA ISR by removing unnecessary register reads.
* tag 'v3.5-soc' of git://gitorious.org/linux-davinci/linux-davinci:
ARM: davinci: optimize the DMA ISR
ARM: davinci: implement DEBUG_LL port choice
+ sync with Linux 3.4-rc6
Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'drivers/i2c/busses/i2c-tegra.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-tegra.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index e978635e60f0..55e5ea62ccee 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -516,6 +516,14 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev, if (likely(i2c_dev->msg_err == I2C_ERR_NONE)) return 0; + /* + * NACK interrupt is generated before the I2C controller generates the + * STOP condition on the bus. So wait for 2 clock periods before resetting + * the controller so that STOP condition has been delivered properly. + */ + if (i2c_dev->msg_err == I2C_ERR_NO_ACK) + udelay(DIV_ROUND_UP(2 * 1000000, i2c_dev->bus_clk_rate)); + tegra_i2c_init(i2c_dev); if (i2c_dev->msg_err == I2C_ERR_NO_ACK) { if (msg->flags & I2C_M_IGNORE_NAK) |