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Message-Id: <1473871930-99603-4-git-send-email-mka@chromium.org>
Date: Wed, 14 Sep 2016 09:52:08 -0700
From: Matthias Kaehlcke <mka@...omium.org>
To: Mark Brown <broonie@...nel.org>, lgirdwood@...il.com
Cc: Douglas Anderson <dianders@...omium.org>, briannorris@...omium.org,
javier@...hile0.org, robh+dt@...nel.org, mark.rutland@....com,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH v5 4/6] regulator: core: Add set_voltage_time op
The new op is analogous to set_voltage_time_sel. It can be used by
regulators which don't have a table of discrete voltages. The function
returns the time for the regulator output voltage to stabilize after
being set to a new value, in microseconds. If the op is not set a
default implementation is used to calculate the delay.
This change also removes the ramp_delay calculation in the PWM
regulator, since the driver now uses the core code for the calculation
of the delay.
Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---
Changes in v5:
- Use _regulator_set_voltage_time() as default if set_voltage_time op is not set
- Split out some changes in separate patche to improve readability of the diff
- Use conditional logic in _regulator_do_set_voltage() instead of gotos
- Reworked regulator_set_voltage_time() to make diff more readable
- Removed ramp delay from PWM regulator
- Updated comments in include/linux/regulator/driver.h
- Updated commit message
drivers/regulator/core.c | 86 +++++++++++++++++++++++++++------------
drivers/regulator/pwm-regulator.c | 10 -----
include/linux/regulator/driver.h | 10 ++++-
3 files changed, 67 insertions(+), 39 deletions(-)
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index df3028b..c52fc0c 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2743,6 +2743,24 @@ static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
return ret;
}
+static int _regulator_set_voltage_time(struct regulator_dev *rdev,
+ int old_uV, int new_uV)
+{
+ unsigned int ramp_delay = 0;
+
+ if (rdev->constraints->ramp_delay)
+ ramp_delay = rdev->constraints->ramp_delay;
+ else if (rdev->desc->ramp_delay)
+ ramp_delay = rdev->desc->ramp_delay;
+
+ if (ramp_delay == 0) {
+ rdev_warn(rdev, "ramp_delay not set\n");
+ return 0;
+ }
+
+ return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
+}
+
static int _regulator_do_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV)
{
@@ -2752,6 +2770,7 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
unsigned int selector;
int old_selector = -1;
const struct regulator_ops *ops = rdev->desc->ops;
+ int old_uV = _regulator_get_voltage(rdev);
trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
@@ -2803,23 +2822,37 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
if (ret)
goto out;
- /* Call set_voltage_time_sel if successfully obtained old_selector */
- if (!old_selector >= 0 && old_selector != selector) {
- delay = ops->set_voltage_time_sel(rdev,
- old_selector, selector);
- if (delay < 0) {
- rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
- delay);
- delay = 0;
+ if (ops->set_voltage_time_sel) {
+ /*
+ * Call set_voltage_time_sel if successfully obtained
+ * old_selector
+ */
+ if (old_selector >= 0 && old_selector != selector)
+ delay = ops->set_voltage_time_sel(rdev, old_selector,
+ selector);
+ } else {
+ if (old_uV != best_val) {
+ if (ops->set_voltage_time)
+ delay = ops->set_voltage_time(rdev, old_uV,
+ best_val);
+ else
+ delay = _regulator_set_voltage_time(rdev,
+ old_uV,
+ best_val);
}
+ }
- /* Insert any necessary delays */
- if (delay >= 1000) {
- mdelay(delay / 1000);
- udelay(delay % 1000);
- } else if (delay) {
- udelay(delay);
- }
+ if (delay < 0) {
+ rdev_warn(rdev, "failed to get delay: %d\n", delay);
+ delay = 0;
+ }
+
+ /* Insert any necessary delays */
+ if (delay >= 1000) {
+ mdelay(delay / 1000);
+ udelay(delay % 1000);
+ } else if (delay) {
+ udelay(delay);
}
if (best_val >= 0) {
@@ -3000,9 +3033,13 @@ int regulator_set_voltage_time(struct regulator *regulator,
int voltage;
int i;
+ if (ops->set_voltage_time)
+ return ops->set_voltage_time(rdev, old_uV, new_uV);
+ else if (!ops->set_voltage_time_sel)
+ return _regulator_set_voltage_time(rdev, old_uV, new_uV);
+
/* Currently requires operations to do this */
- if (!ops->list_voltage || !ops->set_voltage_time_sel
- || !rdev->desc->n_voltages)
+ if (!ops->list_voltage || !rdev->desc->n_voltages)
return -EINVAL;
for (i = 0; i < rdev->desc->n_voltages; i++) {
@@ -3041,17 +3078,8 @@ int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
unsigned int old_selector,
unsigned int new_selector)
{
- unsigned int ramp_delay = 0;
int old_volt, new_volt;
- if (rdev->constraints->ramp_delay)
- ramp_delay = rdev->constraints->ramp_delay;
- else if (rdev->desc->ramp_delay)
- ramp_delay = rdev->desc->ramp_delay;
-
- if (ramp_delay == 0)
- return 0;
-
/* sanity check */
if (!rdev->desc->ops->list_voltage)
return -EINVAL;
@@ -3059,7 +3087,11 @@ int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
- return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
+ if (rdev->desc->ops->set_voltage_time)
+ return rdev->desc->ops->set_voltage_time(rdev, old_volt,
+ new_volt);
+ else
+ return _regulator_set_voltage_time(rdev, old_volt, new_volt);
}
EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c
index c245242..1b88e0e1 100644
--- a/drivers/regulator/pwm-regulator.c
+++ b/drivers/regulator/pwm-regulator.c
@@ -10,7 +10,6 @@
* published by the Free Software Foundation.
*/
-#include <linux/delay.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
@@ -194,12 +193,10 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev,
unsigned int min_uV_duty = drvdata->continuous.min_uV_dutycycle;
unsigned int max_uV_duty = drvdata->continuous.max_uV_dutycycle;
unsigned int duty_unit = drvdata->continuous.dutycycle_unit;
- unsigned int ramp_delay = rdev->constraints->ramp_delay;
int min_uV = rdev->constraints->min_uV;
int max_uV = rdev->constraints->max_uV;
int diff_uV = max_uV - min_uV;
struct pwm_state pstate;
- int old_uV = pwm_regulator_get_voltage(rdev);
unsigned int diff_duty;
unsigned int dutycycle;
int ret;
@@ -233,13 +230,6 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev,
return ret;
}
- if ((ramp_delay == 0) || !pwm_regulator_is_enabled(rdev))
- return 0;
-
- /* Ramp delay is in uV/uS. Adjust to uS and delay */
- ramp_delay = DIV_ROUND_UP(abs(req_min_uV - old_uV), ramp_delay);
- usleep_range(ramp_delay, ramp_delay + DIV_ROUND_UP(ramp_delay, 10));
-
return 0;
}
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index fcfa40a..37b5324 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -113,10 +113,14 @@ struct regulator_linear_range {
* stabilise after being enabled, in microseconds.
* @set_ramp_delay: Set the ramp delay for the regulator. The driver should
* select ramp delay equal to or less than(closest) ramp_delay.
+ * @set_voltage_time: Time taken for the regulator voltage output voltage
+ * to stabilise after being set to a new value, in microseconds.
+ * The function receives the from and to voltage as input, it
+ * should return the worst case.
* @set_voltage_time_sel: Time taken for the regulator voltage output voltage
* to stabilise after being set to a new value, in microseconds.
- * The function provides the from and to voltage selector, the
- * function should return the worst case.
+ * The function receives the from and to voltage selector as
+ * input, it should return the worst case.
* @set_soft_start: Enable soft start for the regulator.
*
* @set_suspend_voltage: Set the voltage for the regulator when the system
@@ -168,6 +172,8 @@ struct regulator_ops {
/* Time taken to enable or set voltage on the regulator */
int (*enable_time) (struct regulator_dev *);
int (*set_ramp_delay) (struct regulator_dev *, int ramp_delay);
+ int (*set_voltage_time) (struct regulator_dev *, int old_uV,
+ int new_uV);
int (*set_voltage_time_sel) (struct regulator_dev *,
unsigned int old_selector,
unsigned int new_selector);
--
2.8.0.rc3.226.g39d4020
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