Messages in this thread Patch in this message | | | From | Enric Balletbo i Serra <> | Subject | [PATCH v3 1/5] pwm-backlight: enable/disable the PWM before/after LCD enable toggle. | Date | Mon, 17 Jul 2017 23:28:07 +0200 |
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Before this patch the enable signal was set before the PWM signal and vice-versa on power off. I guess that this sequence is wrong, at least, it is on the different panels datasheets that I checked, so I inverted the sequence to follow the specs.
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> --- Changes since v2: - Add this as a separate patch (Thierry Reding) Changes since v1: - None
drivers/video/backlight/pwm_bl.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 002f1ce..909a686 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -54,10 +54,11 @@ static void pwm_backlight_power_on(struct pwm_bl_data *pb, int brightness) if (err < 0) dev_err(pb->dev, "failed to enable power supply\n"); + pwm_enable(pb->pwm); + if (pb->enable_gpio) gpiod_set_value_cansleep(pb->enable_gpio, 1); - pwm_enable(pb->pwm); pb->enabled = true; } @@ -66,12 +67,12 @@ static void pwm_backlight_power_off(struct pwm_bl_data *pb) if (!pb->enabled) return; - pwm_config(pb->pwm, 0, pb->period); - pwm_disable(pb->pwm); - if (pb->enable_gpio) gpiod_set_value_cansleep(pb->enable_gpio, 0); + pwm_config(pb->pwm, 0, pb->period); + pwm_disable(pb->pwm); + regulator_disable(pb->power_supply); pb->enabled = false; } -- 2.9.3
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