i2c-davinci: Fix lost interrupt

DAVINCI_I2C_STR_REG is a write 1 to clear register,
so don't use a read/modify/write cycle.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Acked-by: Dirk Behme <dirk.behme@gmail.com>
Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 6 insertions, 11 deletions

diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
index cce5a614758d..fde26345a379 100644
--- a/drivers/i2c/busses/i2c-davinci.c
+++ b/drivers/i2c/busses/i2c-davinci.c
@@ -382,9 +382,8 @@ static irqreturn_t i2c_davinci_isr(int this_irq, void *dev_id)
                         break;
 
                 case DAVINCI_I2C_IVR_ARDY:
-                        w = davinci_i2c_read_reg(dev, DAVINCI_I2C_STR_REG);
-                        MOD_REG_BIT(w, DAVINCI_I2C_STR_ARDY, 1);
-                        davinci_i2c_write_reg(dev, DAVINCI_I2C_STR_REG, w);
+                        davinci_i2c_write_reg(dev,
+                                DAVINCI_I2C_STR_REG, DAVINCI_I2C_STR_ARDY);
                         complete(&dev->cmd_complete);
                         break;
 
@@ -397,12 +396,9 @@ static irqreturn_t i2c_davinci_isr(int this_irq, void *dev_id)
                                 if (dev->buf_len)
                                         continue;
 
-                                w = davinci_i2c_read_reg(dev,
-                                                         DAVINCI_I2C_STR_REG);
-                                MOD_REG_BIT(w, DAVINCI_I2C_IMR_RRDY, 0);
                                 davinci_i2c_write_reg(dev,
-                                                      DAVINCI_I2C_STR_REG,
-                                                      w);
+                                        DAVINCI_I2C_STR_REG,
+                                        DAVINCI_I2C_IMR_RRDY);
                         } else
                                 dev_err(dev->dev, "RDR IRQ while no "
                                         "data requested\n");
@@ -428,9 +424,8 @@ static irqreturn_t i2c_davinci_isr(int this_irq, void *dev_id)
                         break;
 
                 case DAVINCI_I2C_IVR_SCD:
-                        w = davinci_i2c_read_reg(dev, DAVINCI_I2C_STR_REG);
-                        MOD_REG_BIT(w, DAVINCI_I2C_STR_SCD, 1);
-                        davinci_i2c_write_reg(dev, DAVINCI_I2C_STR_REG, w);
+                        davinci_i2c_write_reg(dev,
+                                DAVINCI_I2C_STR_REG, DAVINCI_I2C_STR_SCD);
                         complete(&dev->cmd_complete);
                         break;