[PATCH v2 0/2] Proper slewing delays for qcom spmi regulators

[PATCH v2 0/2] Proper slewing delays for qcom spmi regulators

[Stephen Boyd]

This patch series adds proper slewing delays for qcom spmi regulators
by adding more slewing attributes for other types of regulators besides
FT SMPS and then making all the regulator ops selector based so that
the delays actually take place in the regulator core.

I've tested this by confirming we get proper delays when changing voltages
on PM8916's S2 ULT SMPS regulator and also confirmed the voltage values
by reading raw SPMI registers to confirm voltages are switching correctly.

Changes since v1:
 * Second patch is new to make first patch actually do something

Stephen Boyd (2):
  regulator: qcom_spmi: Add slewing delays for all SMPS types
  regulator: qcom_spmi: Only use selector based regulator ops

 drivers/regulator/qcom_spmi-regulator.c | 218 ++++++++++++++++++++------------
 1 file changed, 137 insertions(+), 81 deletions(-)

-- 
2.8.0.rc4

[PATCH v2 1/2] regulator: qcom_spmi: Add slewing delays for all SMPS types

[Stephen Boyd]

Only the FT SMPS type regulators have slewing supported in the
driver, but all types of SMPS regulators need the same support.
The only difference is that some SMPS regulators don't have a
step size and the step delay is typically 20, not 8. Luckily, the
step size reads as 0 for the non-FT types, so we can always read
that, but we need to detect which type of regulator we're using
to figure out what step delay to use. Make these minor
adjustments to the slew rate calculations and add support for the
delay function to the appropriate regulator ops.

Reported-by: Georgi Djakov <georgi.djakov@linaro.org>
Cc: David Collins <collinsd@codeaurora.org>
Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
---
 drivers/regulator/qcom_spmi-regulator.c | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/drivers/regulator/qcom_spmi-regulator.c b/drivers/regulator/qcom_spmi-regulator.c
index 88a5dc88badc..d9cb3a2c99c0 100644
--- a/drivers/regulator/qcom_spmi-regulator.c
+++ b/drivers/regulator/qcom_spmi-regulator.c
@@ -246,6 +246,7 @@ enum spmi_common_control_register_index {
 
 /* Minimum voltage stepper delay for each step. */
 #define SPMI_FTSMPS_STEP_DELAY		8
+#define SPMI_DEFAULT_STEP_DELAY		20
 
 /*
  * The ratio SPMI_FTSMPS_STEP_MARGIN_NUM/SPMI_FTSMPS_STEP_MARGIN_DEN is used to
@@ -1008,6 +1009,7 @@ static struct regulator_ops spmi_smps_ops = {
 	.disable		= spmi_regulator_common_disable,
 	.is_enabled		= spmi_regulator_common_is_enabled,
 	.set_voltage		= spmi_regulator_common_set_voltage,
+	.set_voltage_time_sel	= spmi_regulator_set_voltage_time_sel,
 	.get_voltage		= spmi_regulator_common_get_voltage,
 	.list_voltage		= spmi_regulator_common_list_voltage,
 	.set_mode		= spmi_regulator_common_set_mode,
@@ -1081,6 +1083,7 @@ static struct regulator_ops spmi_ult_lo_smps_ops = {
 	.disable		= spmi_regulator_common_disable,
 	.is_enabled		= spmi_regulator_common_is_enabled,
 	.set_voltage		= spmi_regulator_ult_lo_smps_set_voltage,
+	.set_voltage_time_sel	= spmi_regulator_set_voltage_time_sel,
 	.get_voltage		= spmi_regulator_ult_lo_smps_get_voltage,
 	.list_voltage		= spmi_regulator_common_list_voltage,
 	.set_mode		= spmi_regulator_common_set_mode,
@@ -1094,6 +1097,7 @@ static struct regulator_ops spmi_ult_ho_smps_ops = {
 	.disable		= spmi_regulator_common_disable,
 	.is_enabled		= spmi_regulator_common_is_enabled,
 	.set_voltage		= spmi_regulator_single_range_set_voltage,
+	.set_voltage_time_sel	= spmi_regulator_set_voltage_time_sel,
 	.get_voltage		= spmi_regulator_single_range_get_voltage,
 	.list_voltage		= spmi_regulator_common_list_voltage,
 	.set_mode		= spmi_regulator_common_set_mode,
@@ -1245,11 +1249,11 @@ found:
 	return 0;
 }
 
-static int spmi_regulator_ftsmps_init_slew_rate(struct spmi_regulator *vreg)
+static int spmi_regulator_init_slew_rate(struct spmi_regulator *vreg)
 {
 	int ret;
 	u8 reg = 0;
-	int step, delay, slew_rate;
+	int step, delay, slew_rate, step_delay;
 	const struct spmi_voltage_range *range;
 
 	ret = spmi_vreg_read(vreg, SPMI_COMMON_REG_STEP_CTRL, &reg, 1);
@@ -1262,6 +1266,15 @@ static int spmi_regulator_ftsmps_init_slew_rate(struct spmi_regulator *vreg)
 	if (!range)
 		return -EINVAL;
 
+	switch (vreg->logical_type) {
+	case SPMI_REGULATOR_LOGICAL_TYPE_FTSMPS:
+		step_delay = SPMI_FTSMPS_STEP_DELAY;
+		break;
+	default:
+		step_delay = SPMI_DEFAULT_STEP_DELAY;
+		break;
+	}
+
 	step = reg & SPMI_FTSMPS_STEP_CTRL_STEP_MASK;
 	step >>= SPMI_FTSMPS_STEP_CTRL_STEP_SHIFT;
 
@@ -1270,7 +1283,7 @@ static int spmi_regulator_ftsmps_init_slew_rate(struct spmi_regulator *vreg)
 
 	/* slew_rate has units of uV/us */
 	slew_rate = SPMI_FTSMPS_CLOCK_RATE * range->step_uV * (1 << step);
-	slew_rate /= 1000 * (SPMI_FTSMPS_STEP_DELAY << delay);
+	slew_rate /= 1000 * (step_delay << delay);
 	slew_rate *= SPMI_FTSMPS_STEP_MARGIN_NUM;
 	slew_rate /= SPMI_FTSMPS_STEP_MARGIN_DEN;
 
@@ -1411,10 +1424,16 @@ static int spmi_regulator_of_parse(struct device_node *node,
 		return ret;
 	}
 
-	if (vreg->logical_type == SPMI_REGULATOR_LOGICAL_TYPE_FTSMPS) {
-		ret = spmi_regulator_ftsmps_init_slew_rate(vreg);
+	switch (vreg->logical_type) {
+	case SPMI_REGULATOR_LOGICAL_TYPE_FTSMPS:
+	case SPMI_REGULATOR_LOGICAL_TYPE_ULT_LO_SMPS:
+	case SPMI_REGULATOR_LOGICAL_TYPE_ULT_HO_SMPS:
+	case SPMI_REGULATOR_LOGICAL_TYPE_SMPS:
+		ret = spmi_regulator_init_slew_rate(vreg);
 		if (ret)
 			return ret;
+	default:
+		break;
 	}
 
 	if (vreg->logical_type != SPMI_REGULATOR_LOGICAL_TYPE_VS)
-- 
2.8.0.rc4

[PATCH v2 2/2] regulator: qcom_spmi: Only use selector based regulator ops

[Stephen Boyd]

Mixing raw voltage and selector based regulator ops is
inconsistent. This driver already supports some selector based
ops via the list_voltage and set_voltage_time_sel ops but it uses
raw voltage ops for get_voltage and set_voltage. This causes
problems for regulator_set_voltage() and automatic insertion of
slewing delays because set_voltage_time_sel() is only used if the
regulator ops are all selector based. Put another way, delays
aren't happening at all right now when we should be waiting for
voltages to settle. Let's move to pure selector based regulator
ops so that the delays are inserted properly.

Cc: Georgi Djakov <georgi.djakov@linaro.org>
Cc: David Collins <collinsd@codeaurora.org>
Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
---
 drivers/regulator/qcom_spmi-regulator.c | 189 +++++++++++++++++++-------------
 1 file changed, 113 insertions(+), 76 deletions(-)

diff --git a/drivers/regulator/qcom_spmi-regulator.c b/drivers/regulator/qcom_spmi-regulator.c
index d9cb3a2c99c0..418d8b593217 100644
--- a/drivers/regulator/qcom_spmi-regulator.c
+++ b/drivers/regulator/qcom_spmi-regulator.c
@@ -255,13 +255,6 @@ enum spmi_common_control_register_index {
 #define SPMI_FTSMPS_STEP_MARGIN_NUM	4
 #define SPMI_FTSMPS_STEP_MARGIN_DEN	5
 
-/*
- * This voltage in uV is returned by get_voltage functions when there is no way
- * to determine the current voltage level.  It is needed because the regulator
- * framework treats a 0 uV voltage as an error.
- */
-#define VOLTAGE_UNKNOWN 1
-
 /* VSET value to decide the range of ULT SMPS */
 #define ULT_SMPS_RANGE_SPLIT 0x60
 
@@ -540,12 +533,12 @@ static int spmi_regulator_common_disable(struct regulator_dev *rdev)
 }
 
 static int spmi_regulator_select_voltage(struct spmi_regulator *vreg,
-		int min_uV, int max_uV, u8 *range_sel, u8 *voltage_sel,
-		unsigned *selector)
+					 int min_uV, int max_uV)
 {
 	const struct spmi_voltage_range *range;
 	int uV = min_uV;
 	int lim_min_uV, lim_max_uV, i, range_id, range_max_uV;
+	int selector, voltage_sel;
 
 	/* Check if request voltage is outside of physically settable range. */
 	lim_min_uV = vreg->set_points->range[0].set_point_min_uV;
@@ -571,14 +564,13 @@ static int spmi_regulator_select_voltage(struct spmi_regulator *vreg,
 
 	range_id = i;
 	range = &vreg->set_points->range[range_id];
-	*range_sel = range->range_sel;
 
 	/*
 	 * Force uV to be an allowed set point by applying a ceiling function to
 	 * the uV value.
 	 */
-	*voltage_sel = DIV_ROUND_UP(uV - range->min_uV, range->step_uV);
-	uV = *voltage_sel * range->step_uV + range->min_uV;
+	voltage_sel = DIV_ROUND_UP(uV - range->min_uV, range->step_uV);
+	uV = voltage_sel * range->step_uV + range->min_uV;
 
 	if (uV > max_uV) {
 		dev_err(vreg->dev,
@@ -588,12 +580,48 @@ static int spmi_regulator_select_voltage(struct spmi_regulator *vreg,
 		return -EINVAL;
 	}
 
-	*selector = 0;
+	selector = 0;
 	for (i = 0; i < range_id; i++)
-		*selector += vreg->set_points->range[i].n_voltages;
-	*selector += (uV - range->set_point_min_uV) / range->step_uV;
+		selector += vreg->set_points->range[i].n_voltages;
+	selector += (uV - range->set_point_min_uV) / range->step_uV;
 
-	return 0;
+	return selector;
+}
+
+static int spmi_sw_selector_to_hw(struct spmi_regulator *vreg,
+				  unsigned selector, u8 *range_sel,
+				  u8 *voltage_sel)
+{
+	const struct spmi_voltage_range *range, *end;
+
+	range = vreg->set_points->range;
+	end = range + vreg->set_points->count;
+
+	for (; range < end; range++) {
+		if (selector < range->n_voltages) {
+			*voltage_sel = selector;
+			*range_sel = range->range_sel;
+			return 0;
+		}
+
+		selector -= range->n_voltages;
+	}
+
+	return -EINVAL;
+}
+
+static int spmi_hw_selector_to_sw(struct spmi_regulator *vreg, u8 hw_sel,
+				  const struct spmi_voltage_range *range)
+{
+	int sw_sel = hw_sel;
+	const struct spmi_voltage_range *r = vreg->set_points->range;
+
+	while (r != range) {
+		sw_sel += r->n_voltages;
+		r++;
+	}
+
+	return sw_sel;
 }
 
 static const struct spmi_voltage_range *
@@ -615,12 +643,11 @@ spmi_regulator_find_range(struct spmi_regulator *vreg)
 }
 
 static int spmi_regulator_select_voltage_same_range(struct spmi_regulator *vreg,
-		int min_uV, int max_uV, u8 *range_sel, u8 *voltage_sel,
-		unsigned *selector)
+		int min_uV, int max_uV)
 {
 	const struct spmi_voltage_range *range;
 	int uV = min_uV;
-	int i;
+	int i, selector;
 
 	range = spmi_regulator_find_range(vreg);
 	if (!range)
@@ -638,8 +665,8 @@ static int spmi_regulator_select_voltage_same_range(struct spmi_regulator *vreg,
 	 * Force uV to be an allowed set point by applying a ceiling function to
 	 * the uV value.
 	 */
-	*voltage_sel = DIV_ROUND_UP(uV - range->min_uV, range->step_uV);
-	uV = *voltage_sel * range->step_uV + range->min_uV;
+	uV = DIV_ROUND_UP(uV - range->min_uV, range->step_uV);
+	uV = uV * range->step_uV + range->min_uV;
 
 	if (uV > max_uV) {
 		/*
@@ -649,43 +676,49 @@ static int spmi_regulator_select_voltage_same_range(struct spmi_regulator *vreg,
 		goto different_range;
 	}
 
-	*selector = 0;
+	selector = 0;
 	for (i = 0; i < vreg->set_points->count; i++) {
 		if (uV >= vreg->set_points->range[i].set_point_min_uV
 		    && uV <= vreg->set_points->range[i].set_point_max_uV) {
-			*selector +=
+			selector +=
 			    (uV - vreg->set_points->range[i].set_point_min_uV)
 				/ vreg->set_points->range[i].step_uV;
 			break;
 		}
 
-		*selector += vreg->set_points->range[i].n_voltages;
+		selector += vreg->set_points->range[i].n_voltages;
 	}
 
-	if (*selector >= vreg->set_points->n_voltages)
+	if (selector >= vreg->set_points->n_voltages)
 		goto different_range;
 
 	return 0;
 
 different_range:
-	return spmi_regulator_select_voltage(vreg, min_uV, max_uV,
-			range_sel, voltage_sel, selector);
+	return spmi_regulator_select_voltage(vreg, min_uV, max_uV);
 }
 
-static int spmi_regulator_common_set_voltage(struct regulator_dev *rdev,
-		int min_uV, int max_uV, unsigned *selector)
+static int spmi_regulator_common_map_voltage(struct regulator_dev *rdev,
+					     int min_uV, int max_uV)
 {
 	struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
-	int ret;
-	u8 buf[2];
-	u8 range_sel, voltage_sel;
 
 	/*
 	 * Favor staying in the current voltage range if possible.  This avoids
 	 * voltage spikes that occur when changing the voltage range.
 	 */
-	ret = spmi_regulator_select_voltage_same_range(vreg, min_uV, max_uV,
-		&range_sel, &voltage_sel, selector);
+	return spmi_regulator_select_voltage_same_range(vreg, min_uV, max_uV);
+}
+
+static int
+spmi_regulator_common_set_voltage(struct regulator_dev *rdev, unsigned selector)
+{
+	struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
+	int ret;
+	u8 buf[2];
+	u8 range_sel, voltage_sel;
+
+	ret = spmi_sw_selector_to_hw(vreg, selector, &range_sel, &voltage_sel);
 	if (ret)
 		return ret;
 
@@ -720,24 +753,24 @@ static int spmi_regulator_common_get_voltage(struct regulator_dev *rdev)
 
 	range = spmi_regulator_find_range(vreg);
 	if (!range)
-		return VOLTAGE_UNKNOWN;
+		return -EINVAL;
 
-	return range->step_uV * voltage_sel + range->min_uV;
+	return spmi_hw_selector_to_sw(vreg, voltage_sel, range);
 }
 
-static int spmi_regulator_single_range_set_voltage(struct regulator_dev *rdev,
-		int min_uV, int max_uV, unsigned *selector)
+static int spmi_regulator_single_map_voltage(struct regulator_dev *rdev,
+		int min_uV, int max_uV)
 {
 	struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
-	int ret;
-	u8 range_sel, sel;
 
-	ret = spmi_regulator_select_voltage(vreg, min_uV, max_uV, &range_sel,
-		&sel, selector);
-	if (ret) {
-		dev_err(vreg->dev, "could not set voltage, ret=%d\n", ret);
-		return ret;
-	}
+	return spmi_regulator_select_voltage(vreg, min_uV, max_uV);
+}
+
+static int spmi_regulator_single_range_set_voltage(struct regulator_dev *rdev,
+						   unsigned selector)
+{
+	struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
+	u8 sel = selector;
 
 	/*
 	 * Certain types of regulators do not have a range select register so
@@ -749,27 +782,24 @@ static int spmi_regulator_single_range_set_voltage(struct regulator_dev *rdev,
 static int spmi_regulator_single_range_get_voltage(struct regulator_dev *rdev)
 {
 	struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
-	const struct spmi_voltage_range *range = vreg->set_points->range;
-	u8 voltage_sel;
+	u8 selector;
+	int ret;
 
-	spmi_vreg_read(vreg, SPMI_COMMON_REG_VOLTAGE_SET, &voltage_sel, 1);
+	ret = spmi_vreg_read(vreg, SPMI_COMMON_REG_VOLTAGE_SET, &selector, 1);
+	if (ret)
+		return ret;
 
-	return range->step_uV * voltage_sel + range->min_uV;
+	return selector;
 }
 
 static int spmi_regulator_ult_lo_smps_set_voltage(struct regulator_dev *rdev,
-		int min_uV, int max_uV, unsigned *selector)
+						  unsigned selector)
 {
 	struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
 	int ret;
 	u8 range_sel, voltage_sel;
 
-	/*
-	 * Favor staying in the current voltage range if possible. This avoids
-	 * voltage spikes that occur when changing the voltage range.
-	 */
-	ret = spmi_regulator_select_voltage_same_range(vreg, min_uV, max_uV,
-		&range_sel, &voltage_sel, selector);
+	ret = spmi_sw_selector_to_hw(vreg, selector, &range_sel, &voltage_sel);
 	if (ret)
 		return ret;
 
@@ -784,7 +814,7 @@ static int spmi_regulator_ult_lo_smps_set_voltage(struct regulator_dev *rdev,
 		voltage_sel |= ULT_SMPS_RANGE_SPLIT;
 
 	return spmi_vreg_update_bits(vreg, SPMI_COMMON_REG_VOLTAGE_SET,
-	       voltage_sel, 0xff);
+				     voltage_sel, 0xff);
 }
 
 static int spmi_regulator_ult_lo_smps_get_voltage(struct regulator_dev *rdev)
@@ -797,12 +827,12 @@ static int spmi_regulator_ult_lo_smps_get_voltage(struct regulator_dev *rdev)
 
 	range = spmi_regulator_find_range(vreg);
 	if (!range)
-		return VOLTAGE_UNKNOWN;
+		return -EINVAL;
 
 	if (range->range_sel == 1)
 		voltage_sel &= ~ULT_SMPS_RANGE_SPLIT;
 
-	return range->step_uV * voltage_sel + range->min_uV;
+	return spmi_hw_selector_to_sw(vreg, voltage_sel, range);
 }
 
 static int spmi_regulator_common_list_voltage(struct regulator_dev *rdev,
@@ -1008,9 +1038,10 @@ static struct regulator_ops spmi_smps_ops = {
 	.enable			= spmi_regulator_common_enable,
 	.disable		= spmi_regulator_common_disable,
 	.is_enabled		= spmi_regulator_common_is_enabled,
-	.set_voltage		= spmi_regulator_common_set_voltage,
+	.set_voltage_sel	= spmi_regulator_common_set_voltage,
 	.set_voltage_time_sel	= spmi_regulator_set_voltage_time_sel,
-	.get_voltage		= spmi_regulator_common_get_voltage,
+	.get_voltage_sel	= spmi_regulator_common_get_voltage,
+	.map_voltage		= spmi_regulator_common_map_voltage,
 	.list_voltage		= spmi_regulator_common_list_voltage,
 	.set_mode		= spmi_regulator_common_set_mode,
 	.get_mode		= spmi_regulator_common_get_mode,
@@ -1022,8 +1053,9 @@ static struct regulator_ops spmi_ldo_ops = {
 	.enable			= spmi_regulator_common_enable,
 	.disable		= spmi_regulator_common_disable,
 	.is_enabled		= spmi_regulator_common_is_enabled,
-	.set_voltage		= spmi_regulator_common_set_voltage,
-	.get_voltage		= spmi_regulator_common_get_voltage,
+	.set_voltage_sel	= spmi_regulator_common_set_voltage,
+	.get_voltage_sel	= spmi_regulator_common_get_voltage,
+	.map_voltage		= spmi_regulator_common_map_voltage,
 	.list_voltage		= spmi_regulator_common_list_voltage,
 	.set_mode		= spmi_regulator_common_set_mode,
 	.get_mode		= spmi_regulator_common_get_mode,
@@ -1038,8 +1070,9 @@ static struct regulator_ops spmi_ln_ldo_ops = {
 	.enable			= spmi_regulator_common_enable,
 	.disable		= spmi_regulator_common_disable,
 	.is_enabled		= spmi_regulator_common_is_enabled,
-	.set_voltage		= spmi_regulator_common_set_voltage,
-	.get_voltage		= spmi_regulator_common_get_voltage,
+	.set_voltage_sel	= spmi_regulator_common_set_voltage,
+	.get_voltage_sel	= spmi_regulator_common_get_voltage,
+	.map_voltage		= spmi_regulator_common_map_voltage,
 	.list_voltage		= spmi_regulator_common_list_voltage,
 	.set_bypass		= spmi_regulator_common_set_bypass,
 	.get_bypass		= spmi_regulator_common_get_bypass,
@@ -1058,8 +1091,9 @@ static struct regulator_ops spmi_boost_ops = {
 	.enable			= spmi_regulator_common_enable,
 	.disable		= spmi_regulator_common_disable,
 	.is_enabled		= spmi_regulator_common_is_enabled,
-	.set_voltage		= spmi_regulator_single_range_set_voltage,
-	.get_voltage		= spmi_regulator_single_range_get_voltage,
+	.set_voltage_sel	= spmi_regulator_single_range_set_voltage,
+	.get_voltage_sel	= spmi_regulator_single_range_get_voltage,
+	.map_voltage		= spmi_regulator_single_map_voltage,
 	.list_voltage		= spmi_regulator_common_list_voltage,
 	.set_input_current_limit = spmi_regulator_set_ilim,
 };
@@ -1068,9 +1102,10 @@ static struct regulator_ops spmi_ftsmps_ops = {
 	.enable			= spmi_regulator_common_enable,
 	.disable		= spmi_regulator_common_disable,
 	.is_enabled		= spmi_regulator_common_is_enabled,
-	.set_voltage		= spmi_regulator_common_set_voltage,
+	.set_voltage_sel	= spmi_regulator_common_set_voltage,
 	.set_voltage_time_sel	= spmi_regulator_set_voltage_time_sel,
-	.get_voltage		= spmi_regulator_common_get_voltage,
+	.get_voltage_sel	= spmi_regulator_common_get_voltage,
+	.map_voltage		= spmi_regulator_common_map_voltage,
 	.list_voltage		= spmi_regulator_common_list_voltage,
 	.set_mode		= spmi_regulator_common_set_mode,
 	.get_mode		= spmi_regulator_common_get_mode,
@@ -1082,9 +1117,9 @@ static struct regulator_ops spmi_ult_lo_smps_ops = {
 	.enable			= spmi_regulator_common_enable,
 	.disable		= spmi_regulator_common_disable,
 	.is_enabled		= spmi_regulator_common_is_enabled,
-	.set_voltage		= spmi_regulator_ult_lo_smps_set_voltage,
+	.set_voltage_sel	= spmi_regulator_ult_lo_smps_set_voltage,
 	.set_voltage_time_sel	= spmi_regulator_set_voltage_time_sel,
-	.get_voltage		= spmi_regulator_ult_lo_smps_get_voltage,
+	.get_voltage_sel	= spmi_regulator_ult_lo_smps_get_voltage,
 	.list_voltage		= spmi_regulator_common_list_voltage,
 	.set_mode		= spmi_regulator_common_set_mode,
 	.get_mode		= spmi_regulator_common_get_mode,
@@ -1096,9 +1131,10 @@ static struct regulator_ops spmi_ult_ho_smps_ops = {
 	.enable			= spmi_regulator_common_enable,
 	.disable		= spmi_regulator_common_disable,
 	.is_enabled		= spmi_regulator_common_is_enabled,
-	.set_voltage		= spmi_regulator_single_range_set_voltage,
+	.set_voltage_sel	= spmi_regulator_single_range_set_voltage,
 	.set_voltage_time_sel	= spmi_regulator_set_voltage_time_sel,
-	.get_voltage		= spmi_regulator_single_range_get_voltage,
+	.get_voltage_sel	= spmi_regulator_single_range_get_voltage,
+	.map_voltage		= spmi_regulator_single_map_voltage,
 	.list_voltage		= spmi_regulator_common_list_voltage,
 	.set_mode		= spmi_regulator_common_set_mode,
 	.get_mode		= spmi_regulator_common_get_mode,
@@ -1110,8 +1146,9 @@ static struct regulator_ops spmi_ult_ldo_ops = {
 	.enable			= spmi_regulator_common_enable,
 	.disable		= spmi_regulator_common_disable,
 	.is_enabled		= spmi_regulator_common_is_enabled,
-	.set_voltage		= spmi_regulator_single_range_set_voltage,
-	.get_voltage		= spmi_regulator_single_range_get_voltage,
+	.set_voltage_sel	= spmi_regulator_single_range_set_voltage,
+	.get_voltage_sel	= spmi_regulator_single_range_get_voltage,
+	.map_voltage		= spmi_regulator_single_map_voltage,
 	.list_voltage		= spmi_regulator_common_list_voltage,
 	.set_mode		= spmi_regulator_common_set_mode,
 	.get_mode		= spmi_regulator_common_get_mode,
-- 
2.8.0.rc4

Re: [PATCH v2 2/2] regulator: qcom_spmi: Only use selector based regulator ops

[Rajendra Nayak]

[]...
  
>  static int spmi_regulator_select_voltage_same_range(struct spmi_regulator *vreg,
> -		int min_uV, int max_uV, u8 *range_sel, u8 *voltage_sel,
> -		unsigned *selector)
> +		int min_uV, int max_uV)
>  {
>  	const struct spmi_voltage_range *range;
>  	int uV = min_uV;
> -	int i;
> +	int i, selector;
>  
>  	range = spmi_regulator_find_range(vreg);
>  	if (!range)
> @@ -638,8 +665,8 @@ static int spmi_regulator_select_voltage_same_range(struct spmi_regulator *vreg,
>  	 * Force uV to be an allowed set point by applying a ceiling function to
>  	 * the uV value.
>  	 */
> -	*voltage_sel = DIV_ROUND_UP(uV - range->min_uV, range->step_uV);
> -	uV = *voltage_sel * range->step_uV + range->min_uV;
> +	uV = DIV_ROUND_UP(uV - range->min_uV, range->step_uV);
> +	uV = uV * range->step_uV + range->min_uV;
>  
>  	if (uV > max_uV) {
>  		/*
> @@ -649,43 +676,49 @@ static int spmi_regulator_select_voltage_same_range(struct spmi_regulator *vreg,
>  		goto different_range;
>  	}
>  
> -	*selector = 0;
> +	selector = 0;
>  	for (i = 0; i < vreg->set_points->count; i++) {
>  		if (uV >= vreg->set_points->range[i].set_point_min_uV
>  		    && uV <= vreg->set_points->range[i].set_point_max_uV) {
> -			*selector +=
> +			selector +=
>  			    (uV - vreg->set_points->range[i].set_point_min_uV)
>  				/ vreg->set_points->range[i].step_uV;
>  			break;
>  		}
>  
> -		*selector += vreg->set_points->range[i].n_voltages;
> +		selector += vreg->set_points->range[i].n_voltages;
>  	}
>  
> -	if (*selector >= vreg->set_points->n_voltages)
> +	if (selector >= vreg->set_points->n_voltages)
>  		goto different_range;
>  
>  	return 0;

This should now return selector instead of 0

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation

[PATCH] regulator: qcom_spmi: Always return a selector when asked

[Stephen Boyd]

I had a thinko in spmi_regulator_select_voltage_same_range() when
converting it to return selectors via the function's return value
instead of by modifying a pointer argument. I only tested
multi-range regulators so this passed through testing. Fix it by
returning the selector here.

Fixes: 1b5b19689278 ("regulator: qcom_spmi: Only use selector based regulator ops")
Reported-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
 drivers/regulator/qcom_spmi-regulator.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/regulator/qcom_spmi-regulator.c b/drivers/regulator/qcom_spmi-regulator.c
index f502f2cc65d8..84cce21e98cd 100644
--- a/drivers/regulator/qcom_spmi-regulator.c
+++ b/drivers/regulator/qcom_spmi-regulator.c
@@ -692,7 +692,7 @@ static int spmi_regulator_select_voltage_same_range(struct spmi_regulator *vreg,
 	if (selector >= vreg->set_points->n_voltages)
 		goto different_range;
 
-	return 0;
+	return selector;
 
 different_range:
 	return spmi_regulator_select_voltage(vreg, min_uV, max_uV);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

Applied "regulator: qcom_spmi: Always return a selector when asked" to the regulator tree

[Mark Brown]

The patch

   regulator: qcom_spmi: Always return a selector when asked

has been applied to the regulator tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From b1d21a24df458c897911af51cb637460c1ac5d95 Mon Sep 17 00:00:00 2001
From: Stephen Boyd <sboyd@codeaurora.org>
Date: Fri, 15 Apr 2016 10:44:37 -0700
Subject: [PATCH] regulator: qcom_spmi: Always return a selector when asked

I had a thinko in spmi_regulator_select_voltage_same_range() when
converting it to return selectors via the function's return value
instead of by modifying a pointer argument. I only tested
multi-range regulators so this passed through testing. Fix it by
returning the selector here.

Fixes: 1b5b19689278 ("regulator: qcom_spmi: Only use selector based regulator ops")
Reported-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/regulator/qcom_spmi-regulator.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/regulator/qcom_spmi-regulator.c b/drivers/regulator/qcom_spmi-regulator.c
index f502f2cc65d8..84cce21e98cd 100644
--- a/drivers/regulator/qcom_spmi-regulator.c
+++ b/drivers/regulator/qcom_spmi-regulator.c
@@ -692,7 +692,7 @@ static int spmi_regulator_select_voltage_same_range(struct spmi_regulator *vreg,
 	if (selector >= vreg->set_points->n_voltages)
 		goto different_range;
 
-	return 0;
+	return selector;
 
 different_range:
 	return spmi_regulator_select_voltage(vreg, min_uV, max_uV);
-- 
2.8.0.rc3