[PATCH v4 2/2] backlight: pwm_bl: Check the PWM state for initial backlight power state
STALE3485d
REVIEWED: 9 (8M)
From: Peter Ujfalusi <hidden>
Date: 2016-11-22 13:42:17
Also in:
linux-pwm, lkml
Subsystem:
backlight class/subsystem, framebuffer layer, the rest · Maintainers:
Lee Jones, Daniel Thompson, Jingoo Han, Helge Deller, Linus Torvalds
Revision v4 of 4 in this series; 2 review trailers.
Revisions (4)
- v1 [diff vs current]
- v2 [diff vs current]
- v3 [diff vs current]
- v4 current
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> Acked-by: Philipp Zabel <p.zabel@pengutronix.de> Reviewed-by: Thierry Reding <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 5712ddd053dd..d7efcb632f7d 100644
--- a/drivers/video/backlight/pwm_bl.c
+++ b/drivers/video/backlight/pwm_bl.c@@ -215,6 +215,10 @@ 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; }
--
2.11.0.rc2