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path: root/drivers/i2c/busses/i2c-omap.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-omap.c')
-rw-r--r--drivers/i2c/busses/i2c-omap.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index d1c22e3fdd14..fc9bf7f30e35 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -1247,7 +1247,14 @@ static void omap_i2c_prepare_recovery(struct i2c_adapter *adap)
u32 reg;
reg = omap_i2c_read_reg(dev, OMAP_I2C_SYSTEST_REG);
+ /* enable test mode */
reg |= OMAP_I2C_SYSTEST_ST_EN;
+ /* select SDA/SCL IO mode */
+ reg |= 3 << OMAP_I2C_SYSTEST_TMODE_SHIFT;
+ /* set SCL to high-impedance state (reset value is 0) */
+ reg |= OMAP_I2C_SYSTEST_SCL_O;
+ /* set SDA to high-impedance state (reset value is 0) */
+ reg |= OMAP_I2C_SYSTEST_SDA_O;
omap_i2c_write_reg(dev, OMAP_I2C_SYSTEST_REG, reg);
}
@@ -1257,7 +1264,11 @@ static void omap_i2c_unprepare_recovery(struct i2c_adapter *adap)
u32 reg;
reg = omap_i2c_read_reg(dev, OMAP_I2C_SYSTEST_REG);
+ /* restore reset values */
reg &= ~OMAP_I2C_SYSTEST_ST_EN;
+ reg &= ~OMAP_I2C_SYSTEST_TMODE_MASK;
+ reg &= ~OMAP_I2C_SYSTEST_SCL_O;
+ reg &= ~OMAP_I2C_SYSTEST_SDA_O;
omap_i2c_write_reg(dev, OMAP_I2C_SYSTEST_REG, reg);
}