The piix4 i2c driver is extremely slow. Replacing msleep()
with usleep_range() increases its speed substantially.
Use sleep ranges similar to those used in the i2c-801 driver
to keep things simple.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
/* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
- msleep(2);
+ usleep_range(2000, 2100);
else
- msleep(1);
+ usleep_range(250, 500);
while ((++timeout < MAX_TIMEOUT) &&
((temp = inb_p(SMBHSTSTS)) & 0x01))
- msleep(1);
+ usleep_range(250, 500);
/* If the SMBus is still busy, we give up */
if (timeout == MAX_TIMEOUT) {