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>
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@ -462,13 +462,13 @@ static int piix4_transaction(struct i2c_adapter *piix4_adapter)
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/* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
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/* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
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if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
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if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
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msleep(2);
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usleep_range(2000, 2100);
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else
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else
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msleep(1);
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usleep_range(250, 500);
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while ((++timeout < MAX_TIMEOUT) &&
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while ((++timeout < MAX_TIMEOUT) &&
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((temp = inb_p(SMBHSTSTS)) & 0x01))
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((temp = inb_p(SMBHSTSTS)) & 0x01))
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msleep(1);
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usleep_range(250, 500);
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/* If the SMBus is still busy, we give up */
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/* If the SMBus is still busy, we give up */
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if (timeout == MAX_TIMEOUT) {
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if (timeout == MAX_TIMEOUT) {
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