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Date: Sat, 29 Sep 2018 01:26:28 +0300
From: Dmitry Osipenko <digetx@...il.com>
To: Tony Lindgren <tony@...mide.com>
Cc: Maciej Purski <m.purski@...sung.com>,
Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
Carlos Hernandez <ceh@...com>,
Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH] regulator: core: Pass max_uV value to
regulator_set_voltage_rdev
On 9/28/18 11:22 PM, Tony Lindgren wrote:
> * Dmitry Osipenko <digetx@...il.com> [180928 20:13]:
>> Tony, could you please give a try to the patch below?
>>
>> Do the following:
>>
>> 1) git cherry-pick 696861761a58d8c93605b5663824929fb6540f16
>> 2) git cherry-pick 456e7cdf3b1a14e2606b8b687385ab2e3f23a49a
>> 3) Apply this patch:
>
> Seems to be getting closer, system boots up and starts
> init, but then I start getting tons of this on beagle-x15:
Tony, could you please try this one? Fixed couple more bugs, should be good now.
>From 9c7382b1a28692576cbe00f57fdea0d25b27cc4c Mon Sep 17 00:00:00 2001
From: Dmitry Osipenko <digetx@...il.com>
Date: Fri, 28 Sep 2018 21:49:20 +0300
Subject: [PATCH] Fixup regulator_balance_voltage() v2
---
drivers/regulator/core.c | 83 ++++++++++++++++++++++++----------------
1 file changed, 50 insertions(+), 33 deletions(-)
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 282511508698..2f3b1cf19bd5 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -105,7 +105,7 @@ static int _notifier_call_chain(struct regulator_dev *rdev,
unsigned long event, void *data);
static int _regulator_do_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV);
-static int regulator_balance_voltage(struct regulator_dev *rdev,
+static int regulator_balance_voltage(struct regulator *regulator,
suspend_state_t state);
static int regulator_set_voltage_rdev(struct regulator_dev *rdev,
int min_uV, int max_uV,
@@ -2330,7 +2330,7 @@ int regulator_enable(struct regulator *regulator)
ret = _regulator_enable(rdev);
/* balance only if there are regulators coupled */
if (rdev->coupling_desc.n_coupled > 1)
- regulator_balance_voltage(rdev, PM_SUSPEND_ON);
+ regulator_balance_voltage(regulator, PM_SUSPEND_ON);
regulator_unlock_dependent(rdev);
if (ret != 0 && rdev->supply)
@@ -2440,7 +2440,7 @@ int regulator_disable(struct regulator *regulator)
regulator_lock_dependent(rdev);
ret = _regulator_disable(rdev);
if (rdev->coupling_desc.n_coupled > 1)
- regulator_balance_voltage(rdev, PM_SUSPEND_ON);
+ regulator_balance_voltage(regulator, PM_SUSPEND_ON);
regulator_unlock_dependent(rdev);
if (ret == 0 && rdev->supply)
@@ -2494,7 +2494,7 @@ int regulator_force_disable(struct regulator *regulator)
regulator->uA_load = 0;
ret = _regulator_force_disable(regulator->rdev);
if (rdev->coupling_desc.n_coupled > 1)
- regulator_balance_voltage(rdev, PM_SUSPEND_ON);
+ regulator_balance_voltage(regulator, PM_SUSPEND_ON);
regulator_unlock_dependent(rdev);
if (rdev->supply)
@@ -3099,12 +3099,8 @@ static int regulator_set_voltage_unlocked(struct regulator *regulator,
voltage->min_uV = min_uV;
voltage->max_uV = max_uV;
- ret = regulator_check_consumers(rdev, &min_uV, &max_uV, state);
- if (ret < 0)
- goto out2;
-
/* for not coupled regulators this will just set the voltage */
- ret = regulator_balance_voltage(rdev, state);
+ ret = regulator_balance_voltage(regulator, state);
if (ret < 0)
goto out2;
@@ -3187,7 +3183,10 @@ static int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV,
return ret;
}
-static int regulator_get_optimal_voltage(struct regulator_dev *rdev)
+static int regulator_get_optimal_voltage(struct regulator *regulator,
+ struct regulator_dev *rdev,
+ int *min_uV, int *max_uV,
+ suspend_state_t state)
{
struct coupling_desc *c_desc = &rdev->coupling_desc;
struct regulator_dev **c_rdevs = c_desc->coupled_rdevs;
@@ -3198,20 +3197,29 @@ static int regulator_get_optimal_voltage(struct regulator_dev *rdev)
int i, ret;
/* If consumers don't provide any demands, set voltage to min_uV */
- desired_min_uV = rdev->constraints->min_uV;
- desired_max_uV = rdev->constraints->max_uV;
- ret = regulator_check_consumers(rdev,
- &desired_min_uV,
- &desired_max_uV, PM_SUSPEND_ON);
- if (ret < 0)
- goto out;
+ if (regulator->rdev == rdev) {
+ desired_min_uV = regulator->voltage[state].min_uV;
+ desired_max_uV = regulator->voltage[state].max_uV;
+
+ ret = regulator_check_consumers(rdev,
+ &desired_min_uV,
+ &desired_max_uV,
+ state);
+ if (ret < 0)
+ goto out;
+ } else {
+ desired_min_uV = rdev->constraints->min_uV;
+ desired_max_uV = rdev->constraints->max_uV;
+ }
/*
* If there are no coupled regulators, simply set the voltage demanded
* by consumers.
*/
- if (n_coupled == 1) {
- ret = desired_min_uV;
+ if (n_coupled == 1 || state != PM_SUSPEND_ON) {
+ *min_uV = desired_min_uV;
+ *max_uV = desired_max_uV;
+ ret = 1;
goto out;
}
@@ -3285,20 +3293,24 @@ static int regulator_get_optimal_voltage(struct regulator_dev *rdev)
ret = -EINVAL;
goto out;
}
- ret = possible_uV;
+ ret = (possible_uV == desired_min_uV);
+ *min_uV = possible_uV;
+ *max_uV = desired_max_uV;
out:
return ret;
}
-static int regulator_balance_voltage(struct regulator_dev *rdev,
+static int regulator_balance_voltage(struct regulator *regulator,
suspend_state_t state)
{
+ struct regulator_dev *rdev = regulator->rdev;
struct regulator_dev **c_rdevs;
struct regulator_dev *best_rdev;
struct coupling_desc *c_desc = &rdev->coupling_desc;
int n_coupled;
- int i, best_delta, best_uV, ret = 1;
+ int i, best_delta, best_min_uV, best_max_uV, ret = 1;
+ bool last = false;
c_rdevs = c_desc->coupled_rdevs;
n_coupled = c_desc->n_coupled;
@@ -3314,9 +3326,10 @@ static int regulator_balance_voltage(struct regulator_dev *rdev,
* Find the best possible voltage change on each loop. Leave the loop
* if there isn't any possible change.
*/
- while (1) {
+ while (!last) {
best_delta = 0;
- best_uV = 0;
+ best_min_uV = 0;
+ best_max_uV = 0;
best_rdev = NULL;
/*
@@ -3330,24 +3343,28 @@ static int regulator_balance_voltage(struct regulator_dev *rdev,
* max_spread constraint in order to balance
* the coupled voltages.
*/
- int optimal_uV, current_uV;
+ int optimal_uV, optimal_max_uV, current_uV;
- optimal_uV = regulator_get_optimal_voltage(c_rdevs[i]);
- if (optimal_uV < 0) {
- ret = optimal_uV;
+ ret = regulator_get_optimal_voltage(regulator,
+ c_rdevs[i],
+ &optimal_uV,
+ &optimal_max_uV,
+ state);
+ if (ret < 0)
goto out;
- }
current_uV = _regulator_get_voltage(c_rdevs[i]);
if (current_uV < 0) {
- ret = optimal_uV;
+ ret = current_uV;
goto out;
}
if (abs(best_delta) < abs(optimal_uV - current_uV)) {
best_delta = optimal_uV - current_uV;
best_rdev = c_rdevs[i];
- best_uV = optimal_uV;
+ best_min_uV = optimal_uV;
+ best_max_uV = optimal_max_uV;
+ last = (best_rdev == rdev && ret > 0);
}
}
@@ -3357,8 +3374,8 @@ static int regulator_balance_voltage(struct regulator_dev *rdev,
goto out;
}
- ret = regulator_set_voltage_rdev(best_rdev, best_uV,
- best_uV, state);
+ ret = regulator_set_voltage_rdev(best_rdev, best_min_uV,
+ best_max_uV, state);
if (ret < 0)
goto out;
--
2.19.0
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