diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-04-19 14:45:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-04-19 14:45:51 -0700 |
| commit | c4bac97b0d3405f760c30636ff0b2e32810507d3 (patch) | |
| tree | 2ede1c4fb638a3d8d2726b9cabeacd8f3e1d54b5 /drivers | |
| parent | 005882e53d62f25dae10351a8d3f13326051e8f5 (diff) | |
| parent | 892c7788c72480e8282b8aafe0783a244cc9f47f (diff) | |
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()
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/video/backlight/pwm_bl.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index d7efcb632f7d..002f1ce22bd0 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -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"); |