Patch "regulator: max8997: Use uV in voltage_map_desc" has been added to the 3.4-stable tree

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This is a note to let you know that I've just added the patch titled

    regulator: max8997: Use uV in voltage_map_desc

to the 3.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     regulator-max8997-use-uv-in-voltage_map_desc.patch
and it can be found in the queue-3.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 31980f8fa9e57f23b301e91dfa79f7f5c517233d Mon Sep 17 00:00:00 2001
From: Axel Lin <axel.lin@xxxxxxxxxx>
Date: Fri, 28 Dec 2012 17:09:03 +0800
Subject: regulator: max8997: Use uV in voltage_map_desc

From: Axel Lin <axel.lin@xxxxxxxxxx>

commit bc3b7756b5ff66828acf7bc24f148d28b8d61108 upstream.

Current code does integer division (min_vol = min_uV / 1000) before pass
min_vol to max8997_get_voltage_proper_val().
So it is possible min_vol is truncated to a smaller value.

For example, if the request min_uV is 800900 for ldo.
min_vol = 800900 / 1000 = 800 (mV)
Then max8997_get_voltage_proper_val returns 800 mV for this case which is lower
than the requested voltage.

Use uV rather than mV in voltage_map_desc to prevent truncation by integer
division.

Signed-off-by: Axel Lin <axel.lin@xxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
[bwh: Backported to 3.2:
 - Adjust context
 - voltage_map_desc also has an n_bits field]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Qiang Huang <h.huangqiang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/regulator/max8997.c |   36 +++++++++++++++++-------------------
 1 file changed, 17 insertions(+), 19 deletions(-)

--- a/drivers/regulator/max8997.c
+++ b/drivers/regulator/max8997.c
@@ -71,26 +71,26 @@ struct voltage_map_desc {
 	unsigned int n_bits;
 };
 
-/* Voltage maps in mV */
+/* Voltage maps in uV */
 static const struct voltage_map_desc ldo_voltage_map_desc = {
-	.min = 800,	.max = 3950,	.step = 50,	.n_bits = 6,
+	.min = 800000,	.max = 3950000,	.step = 50000,	.n_bits = 6,
 }; /* LDO1 ~ 18, 21 all */
 
 static const struct voltage_map_desc buck1245_voltage_map_desc = {
-	.min = 650,	.max = 2225,	.step = 25,	.n_bits = 6,
+	.min = 650000,	.max = 2225000,	.step = 25000,	.n_bits = 6,
 }; /* Buck1, 2, 4, 5 */
 
 static const struct voltage_map_desc buck37_voltage_map_desc = {
-	.min = 750,	.max = 3900,	.step = 50,	.n_bits = 6,
+	.min = 750000,	.max = 3900000,	.step = 50000,	.n_bits = 6,
 }; /* Buck3, 7 */
 
-/* current map in mA */
+/* current map in uA */
 static const struct voltage_map_desc charger_current_map_desc = {
-	.min = 200,	.max = 950,	.step = 50,	.n_bits = 4,
+	.min = 200000,	.max = 950000,	.step = 50000,	.n_bits = 4,
 };
 
 static const struct voltage_map_desc topoff_current_map_desc = {
-	.min = 50,	.max = 200,	.step = 10,	.n_bits = 4,
+	.min = 50000,	.max = 200000,	.step = 10000,	.n_bits = 4,
 };
 
 static const struct voltage_map_desc *reg_voltage_map[] = {
@@ -194,7 +194,7 @@ static int max8997_list_voltage(struct r
 	if (val > desc->max)
 		return -EINVAL;
 
-	return val * 1000;
+	return val;
 }
 
 static int max8997_get_enable_register(struct regulator_dev *rdev,
@@ -496,7 +496,6 @@ static int max8997_set_voltage_ldobuck(s
 {
 	struct max8997_data *max8997 = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = max8997->iodev->i2c;
-	int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 	const struct voltage_map_desc *desc;
 	int rid = rdev_get_id(rdev);
 	int reg, shift = 0, mask, ret;
@@ -522,7 +521,7 @@ static int max8997_set_voltage_ldobuck(s
 
 	desc = reg_voltage_map[rid];
 
-	i = max8997_get_voltage_proper_val(desc, min_vol, max_vol);
+	i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 	if (i < 0)
 		return i;
 
@@ -541,7 +540,7 @@ static int max8997_set_voltage_ldobuck(s
 		/* If the voltage is increasing */
 		if (org < i)
 			udelay(DIV_ROUND_UP(desc->step * (i - org),
-						max8997->ramp_delay));
+						max8997->ramp_delay * 1000));
 	}
 
 	return ret;
@@ -640,7 +639,6 @@ static int max8997_set_voltage_buck(stru
 	const struct voltage_map_desc *desc;
 	int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
 	bool gpio_dvs_mode = false;
-	int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
 
 	if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
 		return -EINVAL;
@@ -665,7 +663,7 @@ static int max8997_set_voltage_buck(stru
 						selector);
 
 	desc = reg_voltage_map[rid];
-	new_val = max8997_get_voltage_proper_val(desc, min_vol, max_vol);
+	new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
 	if (new_val < 0)
 		return new_val;
 
@@ -997,8 +995,8 @@ static __devinit int max8997_pmic_probe(
 		max8997->buck1_vol[i] = ret =
 			max8997_get_voltage_proper_val(
 					&buck1245_voltage_map_desc,
-					pdata->buck1_voltage[i] / 1000,
-					pdata->buck1_voltage[i] / 1000 +
+					pdata->buck1_voltage[i],
+					pdata->buck1_voltage[i] +
 					buck1245_voltage_map_desc.step);
 		if (ret < 0)
 			goto err_alloc;
@@ -1006,8 +1004,8 @@ static __devinit int max8997_pmic_probe(
 		max8997->buck2_vol[i] = ret =
 			max8997_get_voltage_proper_val(
 					&buck1245_voltage_map_desc,
-					pdata->buck2_voltage[i] / 1000,
-					pdata->buck2_voltage[i] / 1000 +
+					pdata->buck2_voltage[i],
+					pdata->buck2_voltage[i] +
 					buck1245_voltage_map_desc.step);
 		if (ret < 0)
 			goto err_alloc;
@@ -1015,8 +1013,8 @@ static __devinit int max8997_pmic_probe(
 		max8997->buck5_vol[i] = ret =
 			max8997_get_voltage_proper_val(
 					&buck1245_voltage_map_desc,
-					pdata->buck5_voltage[i] / 1000,
-					pdata->buck5_voltage[i] / 1000 +
+					pdata->buck5_voltage[i],
+					pdata->buck5_voltage[i] +
 					buck1245_voltage_map_desc.step);
 		if (ret < 0)
 			goto err_alloc;


Patches currently in stable-queue which might be from axel.lin@xxxxxxxxxx are

queue-3.4/regulator-max8997-use-uv-in-voltage_map_desc.patch
queue-3.4/regulator-max8998-ensure-enough-delay-time-for-max8998_set_voltage_buck_time_sel.patch
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