diff options
| author |   Guenter Roeck <linux@roeck-us.net> | 2018-02-26 12:46:52 -0800 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2018-03-02 11:16:52 +0100 |
| commit | 0e89b2fec748177899c1f9ebfbe87714ffa248eb (patch) | |
| tree | 5c9f4e59780ff08005f918b53ec1bfdf222eaaa0 /drivers/i2c | |
| parent | i2c: reformat comments around i2c_smbus_xfer_emulated() (diff) | |
| download | linux-dev-0e89b2fec748177899c1f9ebfbe87714ffa248eb.tar.xz linux-dev-0e89b2fec748177899c1f9ebfbe87714ffa248eb.zip | |
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 <linux@roeck-us.net>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-piix4.c | 6 |
1 files 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) { |