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[I2C] OMAP: Don't write IE state in unidle if 0

Message ID 1261530373-408-1-git-send-email-darkstar6262@gmail.com (mailing list archive)
State Awaiting Upstream, archived
Delegated to: Tony Lindgren
Headers show

Commit Message

Cory Maccarrone Dec. 23, 2009, 1:06 a.m. UTC 
None
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Patch

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 3440d88..c0bb9eb 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -248,7 +248,13 @@  static void omap_i2c_unidle(struct omap_i2c_dev *dev)
 		omap_i2c_write_reg(dev, OMAP_I2C_CON_REG, OMAP_I2C_CON_EN);
 	}
 	dev->idle = 0;
-	omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
+
+	/*
+	 * Don't write to this register if the IE state is 0 as it can
+	 * cause deadlock.
+	 */
+	if (dev->iestate)
+		omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, dev->iestate);
 }
 
 static void omap_i2c_idle(struct omap_i2c_dev *dev)