The patch titled adt7470: fix pwm at a certain level during temperature sensor scan has been added to the -mm tree. Its filename is adt7470-fix-pwm-at-a-certain-level-during-temperature-sensor-scan.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: adt7470: fix pwm at a certain level during temperature sensor scan From: "Darrick J. Wong" <djwong@xxxxxxxxxx> In the small window that it takes to read the temperature sensors, the pwm outputs momentarily drop to 0. This causes a noticeable hiccup in fan speed, which is slightly annoying. The solution is to manually program the pwm output with whatever the automatic value is and then shift the fans to manual control while reading temperatures. Once that is done, put the fans back to whatever mode of control was there before. Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx> Cc: Jean Delvare <khali@xxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/hwmon/adt7470.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff -puN drivers/hwmon/adt7470.c~adt7470-fix-pwm-at-a-certain-level-during-temperature-sensor-scan drivers/hwmon/adt7470.c --- a/drivers/hwmon/adt7470.c~adt7470-fix-pwm-at-a-certain-level-during-temperature-sensor-scan +++ a/drivers/hwmon/adt7470.c @@ -74,6 +74,7 @@ I2C_CLIENT_INSMOD_1(adt7470); #define ADT7470_REG_PWM12_CFG 0x68 #define ADT7470_PWM2_AUTO_MASK 0x40 #define ADT7470_PWM1_AUTO_MASK 0x80 +#define ADT7470_PWM_AUTO_MASK 0xC0 #define ADT7470_REG_PWM34_CFG 0x69 #define ADT7470_PWM3_AUTO_MASK 0x40 #define ADT7470_PWM4_AUTO_MASK 0x80 @@ -223,7 +224,7 @@ static struct adt7470_data *adt7470_upda struct i2c_client *client = to_i2c_client(dev); struct adt7470_data *data = i2c_get_clientdata(client); unsigned long local_jiffies = jiffies; - u8 cfg; + u8 cfg, pwm[4], pwm_cfg[2]; int i; mutex_lock(&data->lock); @@ -232,6 +233,24 @@ static struct adt7470_data *adt7470_upda && data->sensors_valid) goto no_sensor_update; + /* save pwm[1-4] config register */ + pwm_cfg[0] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM_CFG(0)); + pwm_cfg[1] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM_CFG(2)); + + /* set manual pwm to whatever it is set to now */ + for (i = 0; i < ADT7470_FAN_COUNT; i++) + pwm[i] = i2c_smbus_read_byte_data(client, ADT7470_REG_PWM(i)); + + /* put pwm in manual mode */ + i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(0), + pwm_cfg[0] & ~(ADT7470_PWM_AUTO_MASK)); + i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(2), + pwm_cfg[1] & ~(ADT7470_PWM_AUTO_MASK)); + + /* write pwm control to whatever it was */ + for (i = 0; i < ADT7470_FAN_COUNT; i++) + i2c_smbus_write_byte_data(client, ADT7470_REG_PWM(i), pwm[i]); + /* start reading temperature sensors */ cfg = i2c_smbus_read_byte_data(client, ADT7470_REG_CFG); cfg |= 0x80; @@ -249,6 +268,10 @@ static struct adt7470_data *adt7470_upda cfg &= ~0x80; i2c_smbus_write_byte_data(client, ADT7470_REG_CFG, cfg); + /* restore pwm[1-4] config registers */ + i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(0), pwm_cfg[0]); + i2c_smbus_write_byte_data(client, ADT7470_REG_PWM_CFG(2), pwm_cfg[1]); + for (i = 0; i < ADT7470_TEMP_COUNT; i++) data->temp[i] = i2c_smbus_read_byte_data(client, ADT7470_TEMP_REG(i)); _ Patches currently in -mm which might be from djwong@xxxxxxxxxx are linux-next.patch create-a-div_round_closest-macro-to-do-division-with-rounding.patch adt7462-70-73-use-div_round_closest-for-rounded-division.patch adt7470-fix-pwm-at-a-certain-level-during-temperature-sensor-scan.patch adt7470-observe-the-number-of-temperature-sensors-to-shorten-update-time.patch adt7470-make-automatic-fan-control-really-work.patch ibmpex-add-endian-annotation-to-extract_data-helper.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html