[2/2] i2c: piix4: Use usleep_range()

Message ID 1514652658-6228-2-git-send-email-linux@roeck-us.net
State New
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Series
  • [1/2] i2c: piix4: Use request_muxed_region
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Commit Message

Guenter Roeck Dec. 30, 2017, 4:50 p.m.
The piix4 i2c driver is extremely slow. Replacing msleep()
with usleep_range() increases its speed substantially.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/i2c/busses/i2c-piix4.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Patch

diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index 78dd5951d6e7..52a8b1c5c110 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -467,13 +467,13 @@  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, 2000);
 	else
-		msleep(1);
+		usleep_range(500, 1000);
 
 	while ((++timeout < MAX_TIMEOUT) &&
 	       ((temp = inb_p(SMBHSTSTS)) & 0x01))
-		msleep(1);
+		usleep_range(200, 500);
 
 	/* If the SMBus is still busy, we give up */
 	if (timeout == MAX_TIMEOUT) {