[PATCH] i2c-viapro: Refactor control outb

By slightly shifting the interface between vt596_access and
vt596_transaction, we can save two I/O accesses per SMBus transaction.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
 drivers/i2c/busses/i2c-viapro.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/busses/i2c-viapro.c b/drivers/i2c/busses/i2c-viapro.c
index 3be476c..a89a212 100644 (file)
--- a/drivers/i2c/busses/i2c-viapro.c
+++ b/drivers/i2c/busses/i2c-viapro.c
@@ -105,7 +105,7 @@ static struct i2c_adapter vt596_adapter;
 static unsigned int vt596_features;
 
 /* Return -1 on error, 0 on success */
-static int vt596_transaction(void)
+static int vt596_transaction(u8 size)
 {
        int temp;
        int result = 0;
@@ -131,7 +131,7 @@ static int vt596_transaction(void)
        }
 
        /* Start the transaction by setting bit 6 */
-       outb_p(inb(SMBHSTCNT) | 0x40, SMBHSTCNT);
+       outb_p(0x40 | (size & 0x3C), SMBHSTCNT);
 
        /* We will always wait for a fraction of a second */
        do {
@@ -232,9 +232,8 @@ static s32 vt596_access(struct i2c_adapter *adap, u16 addr,
        }
 
        outb_p(((addr & 0x7f) << 1) | read_write, SMBHSTADD);
-       outb_p((size & 0x3C), SMBHSTCNT);
 
-       if (vt596_transaction()) /* Error in transaction */
+       if (vt596_transaction(size)) /* Error in transaction */
                return -1;
 
        if ((read_write == I2C_SMBUS_WRITE) || (size == VT596_QUICK))