---

yaml --- r: 300014 b: refs/heads/master c: f70893d h: refs/heads/master v: v3
git-mirror · Apr 22, 2012 · 08048c1 · 08048c1
1 parent 1bb1475
commit 08048c1
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Showing 2 changed files with 9 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6c557cfee08751d22aed34840f389b846f0f4508
+refs/heads/master: f70893d08338b9cab8008d2e30404ce58930a513
diff --git a/trunk/drivers/i2c/busses/i2c-tegra.c b/trunk/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)