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regulator: s2mps11: Fix invalid selector mask and voltages for buck9 

The buck9 regulator of S2MPS11 PMIC had incorrect vsel_mask (0xff
instead of 0x1f) thus reading entire register as buck9's voltage. This
effectively caused regulator core to interpret values as higher voltages
than they were and then to set real voltage much lower than intended.

The buck9 provides power to other regulators, including LDO13
and LDO19 which supply the MMC2 (SD card). On Odroid XU3/XU4 the lower
voltage caused SD card detection errors on Odroid XU3/XU4:
	mmc1: card never left busy state
	mmc1: error -110 whilst initialising SD card

During driver probe the regulator core was checking whether initial
voltage matches the constraints. With incorrect vsel_mask of 0xff and
default value of 0x50, the core interpreted this as 5 V which is outside
of constraints (3-3.775 V). Then the regulator core was adjusting the
voltage to match the constraints. With incorrect vsel_mask this new
voltage mapped to a vere low voltage in the driver.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: <stable@vger.kernel.org>
This commit is contained in:
Krzysztof Kozlowski 2016-03-28 13:09:56 +09:00 committed by Mark Brown
parent f55532a0c0
commit 3b67262307
2 changed files with 24 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/regulator/s2mps11.c
View File

@ -308,7 +308,7 @@ static struct regulator_ops s2mps11_buck_ops = {
.enable_mask = S2MPS11_ENABLE_MASK \
}
#define regulator_desc_s2mps11_buck6_10(num, min, step) { \
#define regulator_desc_s2mps11_buck67810(num, min, step) { \
.name = "BUCK"#num, \
.id = S2MPS11_BUCK##num, \
.ops = &s2mps11_buck_ops, \
@ -324,6 +324,22 @@ static struct regulator_ops s2mps11_buck_ops = {
.enable_mask = S2MPS11_ENABLE_MASK \
}
#define regulator_desc_s2mps11_buck9 { \
.name = "BUCK9", \
.id = S2MPS11_BUCK9, \
.ops = &s2mps11_buck_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.min_uV = MIN_3000_MV, \
.uV_step = STEP_25_MV, \
.n_voltages = S2MPS11_BUCK9_N_VOLTAGES, \
.ramp_delay = S2MPS11_RAMP_DELAY, \
.vsel_reg = S2MPS11_REG_B9CTRL2, \
.vsel_mask = S2MPS11_BUCK9_VSEL_MASK, \
.enable_reg = S2MPS11_REG_B9CTRL1, \
.enable_mask = S2MPS11_ENABLE_MASK \
}
static const struct regulator_desc s2mps11_regulators[] = {
regulator_desc_s2mps11_ldo(1, STEP_25_MV),
regulator_desc_s2mps11_ldo(2, STEP_50_MV),
@ -368,11 +384,11 @@ static const struct regulator_desc s2mps11_regulators[] = {
regulator_desc_s2mps11_buck1_4(3),
regulator_desc_s2mps11_buck1_4(4),
regulator_desc_s2mps11_buck5,
regulator_desc_s2mps11_buck6_10(6, MIN_600_MV, STEP_6_25_MV),
regulator_desc_s2mps11_buck6_10(7, MIN_600_MV, STEP_6_25_MV),
regulator_desc_s2mps11_buck6_10(8, MIN_600_MV, STEP_6_25_MV),
regulator_desc_s2mps11_buck6_10(9, MIN_3000_MV, STEP_25_MV),
regulator_desc_s2mps11_buck6_10(10, MIN_750_MV, STEP_12_5_MV),
regulator_desc_s2mps11_buck67810(6, MIN_600_MV, STEP_6_25_MV),
regulator_desc_s2mps11_buck67810(7, MIN_600_MV, STEP_6_25_MV),
regulator_desc_s2mps11_buck67810(8, MIN_600_MV, STEP_6_25_MV),
regulator_desc_s2mps11_buck9,
regulator_desc_s2mps11_buck67810(10, MIN_750_MV, STEP_12_5_MV),
};
static struct regulator_ops s2mps14_reg_ops;

2
include/linux/mfd/samsung/s2mps11.h
View File

@ -173,10 +173,12 @@ enum s2mps11_regulators {
#define S2MPS11_LDO_VSEL_MASK 0x3F
#define S2MPS11_BUCK_VSEL_MASK 0xFF
#define S2MPS11_BUCK9_VSEL_MASK 0x1F
#define S2MPS11_ENABLE_MASK (0x03 << S2MPS11_ENABLE_SHIFT)
#define S2MPS11_ENABLE_SHIFT 0x06
#define S2MPS11_LDO_N_VOLTAGES (S2MPS11_LDO_VSEL_MASK + 1)
#define S2MPS11_BUCK_N_VOLTAGES (S2MPS11_BUCK_VSEL_MASK + 1)
#define S2MPS11_BUCK9_N_VOLTAGES (S2MPS11_BUCK9_VSEL_MASK + 1)
#define S2MPS11_RAMP_DELAY 25000 /* uV/us */
#define S2MPS11_CTRL1_PWRHOLD_MASK BIT(4)