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backlight: pwm_bl: Fix GPIO out for unimplemented .get_direction()

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Fix a single bug in the PWM backlight driver and make it play nice
 with a wider range of GPIO devices. This bug is a regression and was
 independently discovered by Geert Uytterhoevan and Paul Kocialkowski
 (and is tested by both).
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Merge tag 'backlight-for-v4.11' of git://git.linaro.org/people/daniel.thompson/linux

Pull backlight fix from Daniel Thompson:
 "Normally pull requests for backlight come from Lee Jones (and will
  continue to do so) but the bug fixed here is annoying for few people
  so I'm providing a little holiday cover.

  Fix a single bug in the PWM backlight driver and make it play nice
  with a wider range of GPIO devices. This bug is a regression and was
  independently discovered by Geert Uytterhoevan and Paul Kocialkowski
  (and is tested by both)"

* tag 'backlight-for-v4.11' of git://git.linaro.org/people/daniel.thompson/linux:
  backlight: pwm_bl: Fix GPIO out for unimplemented .get_direction()
This commit is contained in:
Linus Torvalds 2017-04-19 14:45:51 -07:00
commit c4bac97b0d
1 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/video/backlight/pwm_bl.c
View File

@ -297,14 +297,15 @@ static int pwm_backlight_probe(struct platform_device *pdev)
}
/*
* If the GPIO is configured as input, change the direction to output
* and set the GPIO as active.
* If the GPIO is not known to be already configured as output, that
* is, if gpiod_get_direction returns either GPIOF_DIR_IN or -EINVAL,
* change the direction to output and set the GPIO as active.
* Do not force the GPIO to active when it was already output as it
* could cause backlight flickering or we would enable the backlight too
* early. Leave the decision of the initial backlight state for later.
*/
if (pb->enable_gpio &&
gpiod_get_direction(pb->enable_gpio) == GPIOF_DIR_IN)
gpiod_get_direction(pb->enable_gpio) != GPIOF_DIR_OUT)
gpiod_direction_output(pb->enable_gpio, 1);
pb->power_supply = devm_regulator_get(&pdev->dev, "power");