From 0e89b2fec748177899c1f9ebfbe87714ffa248eb Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Mon, 26 Feb 2018 12:46:52 -0800 Subject: [PATCH] i2c: piix4: Use usleep_range() 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 Reviewed-by: Jean Delvare Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-piix4.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c index 462948e2c535..4c1f6aaec0fc 100644 --- a/drivers/i2c/busses/i2c-piix4.c +++ b/drivers/i2c/busses/i2c-piix4.c @@ -462,13 +462,13 @@ static int piix4_transaction(struct i2c_adapter *piix4_adapter) /* 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) { -- 2.30.2