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>

1 files changed, 7 insertions, 26 deletions

diff --git a/drivers/hwmon/w83795.c b/drivers/hwmon/w83795.c
index 07e8de58dcd4..a1d884bb58ad 100644
--- a/drivers/hwmon/w83795.c
+++ b/drivers/hwmon/w83795.c
@@ -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)