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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 <wellsk40@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Kevin Wells 2010-03-16 15:55:36 -07:00 committed by Ben Dooks
parent 7c6bd2010f
commit be80dbaa3e
1 changed files with 2 additions and 0 deletions
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2
drivers/i2c/busses/i2c-pnx.c
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@ -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));