From c2588393e6315ab68207323d37d2a73713d6bc81 Mon Sep 17 00:00:00 2001 From: Douglas Anderson Date: Wed, 6 Jul 2016 11:42:01 -0700 Subject: [PATCH] regulator: pwm: Fix regulator ramp delay for continuous mode The original commit adding support for continuous voltage mode didn't handle the regulator ramp delay properly. It treated the delay as a fixed delay in uS despite the property being defined as uV / uS. Let's adjust it. Luckily there appear to be no users of this ramp delay for PWM regulators (as per grepping through device trees in linuxnext). Note also that the upper bound of usleep_range probably shouldn't be a full 1 ms longer than the lower bound since I've seen plenty of hardware with a ramp rate of ~5000 uS / uV and for small jumps the total delays are in the tens of uS. 1000 is way too much. We'll try to be dynamic and use 10%. NOTE: This commit doesn't add support for regulator-enable-ramp-delay. That could be done in a future patch when someone has a user of that featre. Though this patch is shows as "fixing" a bug, there are no actual known users of continuous mode PWM regulator w/ ramp delay in mainline and so this likely won't have any effect on anyone unless they are working out-of-tree with private patches. For anyone in this state, it is highly encouraged to also pick Boris Brezillon's WIP patches to get yourself a reliable and glitch-free regulator. Fixes: 4773be185a0f ("regulator: pwm-regulator: Add support for continuous-voltage") Signed-off-by: Douglas Anderson Acked-by: Laxman Dewangan Signed-off-by: Mark Brown --- drivers/regulator/pwm-regulator.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index 90f8b7f..666bc3b 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -145,6 +145,7 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev, unsigned int duty_pulse; u64 req_period; u32 rem; + int old_uV = pwm_regulator_get_voltage(rdev); int ret; pwm_get_args(drvdata->pwm, &pargs); @@ -174,8 +175,12 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev, drvdata->volt_uV = min_uV; - /* Delay required by PWM regulator to settle to the new voltage */ - usleep_range(ramp_delay, ramp_delay + 1000); + if ((ramp_delay == 0) || !pwm_regulator_is_enabled(rdev)) + return 0; + + /* Ramp delay is in uV/uS. Adjust to uS and delay */ + ramp_delay = DIV_ROUND_UP(abs(min_uV - old_uV), ramp_delay); + usleep_range(ramp_delay, ramp_delay + DIV_ROUND_UP(ramp_delay, 10)); return 0; } -- 2.7.4