[PATCH 2/2] backlight: pwm_bl: Check the pwm state for initial backlight power state
From: Peter Ujfalusi <hidden>
Date: 2016-09-30 07:03:25
Also in:
linux-pwm, lkml
Subsystem:
backlight class/subsystem, framebuffer layer, the rest · Maintainers:
Lee Jones, Daniel Thompson, Jingoo Han, Helge Deller, Linus Torvalds
If the pwm is not enabled the backlight initially should not be enabled either if we have booted with DT and there is a phandle pointing to the backlight node. The patch extends the checks to decide if we should keep the backlight off initially. Signed-off-by: Peter Ujfalusi <redacted> --- drivers/video/backlight/pwm_bl.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c
index 9bc4715bf116..e4326bbf807f 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c@@ -223,6 +223,10 @@ static int pwm_backlight_initial_power_state(const struct pwm_bl_data *pb) if (!regulator_is_enabled(pb->power_supply)) return FB_BLANK_POWERDOWN; + /* The pwm is disabled, keep it like this */ + if (!pwm_is_enabled(pb->pwm)) + return FB_BLANK_POWERDOWN; + return FB_BLANK_UNBLANK; }
--
2.10.0