i2c-omap: Don't write IE state in unidle if 0

Commit ef871432... (i2c-omap: OMAP3: PM: (re)init for every transfer
to support off-mode) introduced a change which make the dev->iestate
contents be written to the OMAP_I2C_IE_REG every time omap_i2c_unidle
is called.  Previously, the state was only written if it wasn't equal
to zero.

In omap_i2c_probe, omap_i2c_unidle() is called prior to omap_i2c_init(),
in which case dev->iestate has not yet been initialized and will be set
to zero.  Having this value written to the registers causes deadlock
while booting.

As such, this change restores the original functionality.

Signed-off-by: Cory Maccarrone <darkstar6262@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 75bf3ad180993a2315a9af4dfd3b30f5bd1067f2..a64a192c44a4bd908de8b1fc560bc5ab7eb644dd 100644 (file)
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -247,7 +247,13 @@ 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)