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hwmon: (w83795) Don't pre-read values we'll update later 

There is no point in reading registers during initialization if we
will refresh the values in the update function later. This is only
slowing down the driver loading with no benefit, stop doing it.
This change saves 480 ms on driver load on my test system.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare 2010-10-28 20:31:48 +02:00 committed by Jean Delvare
parent 39deb6993e
commit 5f7b77cbd4
1 changed files with 7 additions and 26 deletions
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33
drivers/hwmon/w83795.c
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@ -1903,7 +1903,7 @@ static int w83795_probe(struct i2c_client *client,
}
}
/* First update the voltages measured value and limits */
/* Read the voltage limits */
for (i = 0; i < ARRAY_SIZE(data->in); i++) {
if (!(data->has_in & (1 << i)))
continue;
@ -1911,9 +1911,6 @@ static int w83795_probe(struct i2c_client *client,
w83795_read(client, W83795_REG_IN[i][IN_MAX]);
data->in[i][IN_LOW] =
w83795_read(client, W83795_REG_IN[i][IN_LOW]);
tmp = w83795_read(client, W83795_REG_IN[i][IN_READ]) << 2;
tmp |= w83795_read(client, W83795_REG_VRLSB) >> 6;
data->in[i][IN_READ] = tmp;
}
for (i = 0; i < ARRAY_SIZE(data->in_lsb); i++) {
if ((i == 2 && data->chip_type == w83795adg) ||
@ -1926,7 +1923,7 @@ static int w83795_probe(struct i2c_client *client,
}
data->has_gain = w83795_read(client, W83795_REG_VMIGB_CTRL) & 0x0f;
/* First update fan and limits */
/* Read the fan limits */
for (i = 0; i < ARRAY_SIZE(data->fan); i++) {
/* Each register contains LSB for 2 fans, but we want to
* read it only once to save time */
@ -1939,11 +1936,9 @@ static int w83795_probe(struct i2c_client *client,
w83795_read(client, W83795_REG_FAN_MIN_HL(i)) << 4;
data->fan_min[i] |=
(tmp >> W83795_REG_FAN_MIN_LSB_SHIFT(i)) & 0x0F;
data->fan[i] = w83795_read(client, W83795_REG_FAN(i)) << 4;
data->fan[i] |= w83795_read(client, W83795_REG_VRLSB) >> 4;
}
/* temperature and limits */
/* Read the temperature limits */
for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
if (!(data->has_temp & (1 << i)))
continue;
@ -1955,13 +1950,9 @@ static int w83795_probe(struct i2c_client *client,
w83795_read(client, W83795_REG_TEMP[i][TEMP_WARN]);
data->temp[i][TEMP_WARN_HYST] =
w83795_read(client, W83795_REG_TEMP[i][TEMP_WARN_HYST]);
data->temp[i][TEMP_READ] =
w83795_read(client, W83795_REG_TEMP[i][TEMP_READ]);
data->temp_read_vrlsb[i] =
w83795_read(client, W83795_REG_VRLSB);
}
/* dts temperature and limits */
/* Read the DTS limits */
if (data->enable_dts != 0) {
data->dts_ext[DTS_CRIT] =
w83795_read(client, W83795_REG_DTS_EXT(DTS_CRIT));
@ -1971,13 +1962,6 @@ static int w83795_probe(struct i2c_client *client,
w83795_read(client, W83795_REG_DTS_EXT(DTS_WARN));
data->dts_ext[DTS_WARN_HYST] =
w83795_read(client, W83795_REG_DTS_EXT(DTS_WARN_HYST));
for (i = 0; i < ARRAY_SIZE(data->dts); i++) {
if (!(data->has_dts & (1 << i)))
continue;
data->dts[i] = w83795_read(client, W83795_REG_DTS(i));
data->dts_read_vrlsb[i] =
w83795_read(client, W83795_REG_VRLSB);
}
}
/* First update temp source selction */
@ -1995,10 +1979,9 @@ static int w83795_probe(struct i2c_client *client,
data->pwm_tfmr[i] = w83795_read(client, W83795_REG_TFMR(i));
data->pwm_fomc = w83795_read(client, W83795_REG_FOMC);
for (i = 0; i < data->has_pwm; i++) {
for (tmp = 0; tmp < 5; tmp++) {
for (tmp = PWM_START; tmp <= PWM_FREQ; tmp++)
data->pwm[i][tmp] =
w83795_read(client, W83795_REG_PWM(i, tmp));
}
}
for (i = 0; i < 8; i++) {
data->target_speed[i] =
@ -2033,11 +2016,9 @@ static int w83795_probe(struct i2c_client *client,
w83795_read(client, W83795_REG_SETUP_PWM(i));
}
/* alarm and beep */
for (i = 0; i < ARRAY_SIZE(data->alarms); i++) {
data->alarms[i] = w83795_read(client, W83795_REG_ALARM(i));
/* Read beep settings */
for (i = 0; i < ARRAY_SIZE(data->beeps); i++)
data->beeps[i] = w83795_read(client, W83795_REG_BEEP(i));
}
err = w83795_handle_files(dev, device_create_file);
if (err)