Messages in this thread Patch in this message | | | From | Steve Twiss <> | Date | Wed, 20 Jul 2016 15:53:58 +0100 | Subject | [PATCH V1] regulator: da9053/52: Fix incorrectly stated minimum and maximum voltage limits |
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From: Steve Twiss <stwiss.opensource@diasemi.com>
This fix alters the minimum and maximum BUCK voltage limits for DA9052 and DA9053. It does so for the following cases:
DA9052 - BUCK3 (MEM) min: 0.925V -> 0.950V max: 2.500V -> 2.525V
DA9053 - BUCK3 (MEM) min: 0.925V -> 0.950V max: 2.500V -> 2.525V - BUCK4 (PERI) min: 0.925V -> 0.950V max: 2.500V -> 2.525V
The voltage range remains the same, but the limits are shifted by +0.025V.
This change is provided on DA9052:MEM, DA9053:MEM and DA9053:PERI and is a voltage difference of 0.025V, compared to those measured before this fix is applied. The patch has the effect of decreasing *all* measured voltages on those BUCKs when compared against the previously measured values for the same software voltage request.
For example, with this fix applied for DA9052:MEM, DA9053:MEM and DA9053:PERI, the following is true.
Because the previous software defined slot 0 as being 0.925V, if a request for 0.950V was previously sent, the slot 1 voltage would have been used. This would have corresponded to an actual measured voltage of 0.975V. But, with this patch fix, and with slot 0 properly aligned to 0.950V, if a voltage of 0.950V is requested by software, a measured value of 0.950V will be provided.
Tested-by: Steve Twiss <stwiss.opensource@diasemi.com> Signed-off-by: Steve Twiss <stwiss.opensource@diasemi.com>
--- This patch applies against linux-next and v4.7-rc7
Hi Mark,
The advice for this patch is NOT to push these changes backwards into older Linux stable kernels.
Although I have tested the patches for the current kernel linux-next/v4.7-rc7 and for the stable releases: v4.6.4, v4.5.7, v4.4.15 and v4.1.28; I have NOT requested any Cc: <stable@vger.kernel.org> in this case.
The patch change will have the effect of decreasing *all* measured voltages provided on DA9052:MEM, DA9053:MEM and DA9053:PERI by 0.025V compared to those measured before the fix is applied.
Even though the new voltage measurement value will be correct, a small decrease in the expected voltage could theoretically cause problems for any system closely tuned to expect the previous voltage measure. This is despite the voltage difference being only 0.025V (which at 1V will be below the 3% tolerance limit of the BUCKs and LDOs). However, there could still be a risk for existing systems that have been tuned exceptionally tightly, even if this is a highly unlikely scenario.
That is the unknown here, and the basis for the recommendation. Even though the risk is estimated to be very low in this case, because it is a perceived risk to existing systems the patch should not be back-ported into the linux-stable kernel trees.
Regards, Steve
drivers/regulator/da9052-regulator.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/regulator/da9052-regulator.c b/drivers/regulator/da9052-regulator.c index 1050cb7..9ececfe 100644 --- a/drivers/regulator/da9052-regulator.c +++ b/drivers/regulator/da9052-regulator.c @@ -333,7 +333,7 @@ static const struct regulator_ops da9052_ldo_ops = { static struct da9052_regulator_info da9052_regulator_info[] = { DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO), DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO), - DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO), + DA9052_DCDC(BUCK3, 25, 950, 2525, 6, 6, DA9052_SUPPLY_VBMEMGO), DA9052_DCDC(BUCK4, 50, 1800, 3600, 5, 6, 0), DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0), DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO), @@ -350,8 +350,8 @@ static struct da9052_regulator_info da9052_regulator_info[] = { static struct da9052_regulator_info da9053_regulator_info[] = { DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO), DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO), - DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO), - DA9052_DCDC(BUCK4, 25, 925, 2500, 6, 6, 0), + DA9052_DCDC(BUCK3, 25, 950, 2525, 6, 6, DA9052_SUPPLY_VBMEMGO), + DA9052_DCDC(BUCK4, 25, 950, 2525, 6, 6, 0), DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0), DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO), DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO), -- end-of-patch for PATCH V1
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