i2c-pnx: Limit maximum divider to 1023

Limit maximum divider to 0x3ff to divider computations. On high I2C
parent clock rates, the divider can exceed 0x3ff. This will help
prevent some very odd clock rates.

Signed-off-by: Kevin Wells <[email protected]>
Signed-off-by: Ben Dooks <[email protected]>

diff --git a/drivers/i2c/busses/i2c-pnx.c b/drivers/i2c/busses/i2c-pnx.c
index 247103372a066ae35fd418089f8ecaa076497211..68fa415d9ad552a93e8cf65164b184bd6a76bae1 100644 (file)
--- a/drivers/i2c/busses/i2c-pnx.c
+++ b/drivers/i2c/busses/i2c-pnx.c
@@ -633,6 +633,8 @@ static int __devinit i2c_pnx_probe(struct platform_device *pdev)
         */
 
        tmp = ((freq / 1000) / I2C_PNX_SPEED_KHZ) / 2 - 2;
+       if (tmp > 0x3FF)
+               tmp = 0x3FF;
        iowrite32(tmp, I2C_REG_CKH(alg_data));
        iowrite32(tmp, I2C_REG_CKL(alg_data));