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Subject[PATCH 4.14 39/41] pwm-backlight: Enable/disable the PWM before/after LCD enable toggle.
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Enric Balletbo i Serra <enric.balletbo@collabora.com>

commit 5fb5caee92ba35a4a3baa61d45a78eb057e2c031 upstream.

Before this patch the enable signal was set before the PWM signal and
vice-versa on power off. 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.

For reference the following panels have the mentioned sequence:
- N133HSE-EA1 (Innolux)
- N116BGE (Innolux)
- N156BGE-L21 (Innolux)
- B101EAN0 (Auo)
- B101AW03 (Auo)
- LTN101NT05 (Samsung)
- CLAA101WA01A (Chunghwa)

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
Acked-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/video/backlight/pwm_bl.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c
@@ -54,10 +54,11 @@ static void pwm_backlight_power_on(struc
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(stru
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;
}

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