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authorMårten Lindahl <marten.lindahl@axis.com>2022-06-14 11:38:54 +0200
committerGuenter Roeck <linux@roeck-us.net>2022-07-13 08:38:20 -0700
commit07fb76273db89d9340fa1fea2997d73fa3768ab9 (patch)
tree500a59d874257de003e22dd0062b3defab1cbc0d /drivers/hwmon/pmbus/pmbus_core.c
parentb674bcb13f418e0580878c21afbe14c4bdfa3138 (diff)
hwmon: (pmbus) Introduce and use cached vout margins
When setting a new voltage the voltage boundaries are read every time to check that the new voltage is within the proper range. Checking these voltage boundaries consists of reading one of PMBUS_MFR_VOUT_MIN/ PMBUS_VOUT_MARGIN_LOW registers and then PMBUS_MFR_VOUT_MAX/ PMBUS_VOUT_MARGIN_HIGH together with writing the PMBUS_CLEAR_FAULTS register. Since these boundaries are never being changed, it can be cached and thus saving unnecessary smbus transmissions. Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com> Link: https://lore.kernel.org/r/20220614093856.3470672-2-marten.lindahl@axis.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/pmbus/pmbus_core.c')
-rw-r--r--drivers/hwmon/pmbus/pmbus_core.c78
1 files changed, 61 insertions, 17 deletions
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 4187dc20d2aa..8c6f44988ba5 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -104,6 +104,9 @@ struct pmbus_data {
s16 currpage; /* current page, -1 for unknown/unset */
s16 currphase; /* current phase, 0xff for all, -1 for unknown/unset */
+
+ int vout_low[PMBUS_PAGES]; /* voltage low margin */
+ int vout_high[PMBUS_PAGES]; /* voltage high margin */
};
struct pmbus_debugfs_entry {
@@ -2848,6 +2851,58 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
return 0;
}
+static int pmbus_regulator_get_low_margin(struct i2c_client *client, int page)
+{
+ struct pmbus_data *data = i2c_get_clientdata(client);
+ struct pmbus_sensor s = {
+ .page = page,
+ .class = PSC_VOLTAGE_OUT,
+ .convert = true,
+ .data = -1,
+ };
+
+ if (!data->vout_low[page]) {
+ if (pmbus_check_word_register(client, page, PMBUS_MFR_VOUT_MIN))
+ s.data = _pmbus_read_word_data(client, page, 0xff,
+ PMBUS_MFR_VOUT_MIN);
+ if (s.data < 0) {
+ s.data = _pmbus_read_word_data(client, page, 0xff,
+ PMBUS_VOUT_MARGIN_LOW);
+ if (s.data < 0)
+ return s.data;
+ }
+ data->vout_low[page] = pmbus_reg2data(data, &s);
+ }
+
+ return data->vout_low[page];
+}
+
+static int pmbus_regulator_get_high_margin(struct i2c_client *client, int page)
+{
+ struct pmbus_data *data = i2c_get_clientdata(client);
+ struct pmbus_sensor s = {
+ .page = page,
+ .class = PSC_VOLTAGE_OUT,
+ .convert = true,
+ .data = -1,
+ };
+
+ if (!data->vout_high[page]) {
+ if (pmbus_check_word_register(client, page, PMBUS_MFR_VOUT_MAX))
+ s.data = _pmbus_read_word_data(client, page, 0xff,
+ PMBUS_MFR_VOUT_MAX);
+ if (s.data < 0) {
+ s.data = _pmbus_read_word_data(client, page, 0xff,
+ PMBUS_VOUT_MARGIN_HIGH);
+ if (s.data < 0)
+ return s.data;
+ }
+ data->vout_high[page] = pmbus_reg2data(data, &s);
+ }
+
+ return data->vout_high[page];
+}
+
static int pmbus_regulator_get_voltage(struct regulator_dev *rdev)
{
struct device *dev = rdev_get_dev(rdev);
@@ -2883,24 +2938,13 @@ static int pmbus_regulator_set_voltage(struct regulator_dev *rdev, int min_uv,
*selector = 0;
- if (pmbus_check_word_register(client, s.page, PMBUS_MFR_VOUT_MIN))
- s.data = _pmbus_read_word_data(client, s.page, 0xff, PMBUS_MFR_VOUT_MIN);
- if (s.data < 0) {
- s.data = _pmbus_read_word_data(client, s.page, 0xff, PMBUS_VOUT_MARGIN_LOW);
- if (s.data < 0)
- return s.data;
- }
- low = pmbus_reg2data(data, &s);
+ low = pmbus_regulator_get_low_margin(client, s.page);
+ if (low < 0)
+ return low;
- s.data = -1;
- if (pmbus_check_word_register(client, s.page, PMBUS_MFR_VOUT_MAX))
- s.data = _pmbus_read_word_data(client, s.page, 0xff, PMBUS_MFR_VOUT_MAX);
- if (s.data < 0) {
- s.data = _pmbus_read_word_data(client, s.page, 0xff, PMBUS_VOUT_MARGIN_HIGH);
- if (s.data < 0)
- return s.data;
- }
- high = pmbus_reg2data(data, &s);
+ high = pmbus_regulator_get_high_margin(client, s.page);
+ if (high < 0)
+ return high;
/* Make sure we are within margins */
if (low > val)