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pwm-backlight: Enable/disable the PWM before/after LCD enable toggle. 

commit 5fb5caee92 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>
This commit is contained in:
Enric Balletbo i Serra 2018-03-28 19:03:23 +02:00 committed by Greg Kroah-Hartman
parent 018ea3fea1
commit 40616958fe
1 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/video/backlight/pwm_bl.c
View File

@ -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;
}