The backlight power state handling is supremely confusing. We have:
- props.power, using FB_BLANK_* defines
- props.fb_blank, using the same, but deprecated int favour of
props.state
- props.state, using the BL_CORE_* defines
- and finally a bunch of backlight drivers treat brightness == 0 as
off. But of course not all of them.
This is way too much confusion to fix in a simple patch, but at least
prevent more hilarity from spreading by removing the unused BL_CORE_*
defines. I have no idea why exactly anyone would need that.
Wrt the ideal state, we really just want a boolean state. The 4 power
saving states that the fbdev subsystem uses are overkill in todays hw
(this was only relevant for VGA and similar analog circuits like
TV-out), the new drm atomic modeset api simplified even the uapi to a
simple bool. And there was never a valid technical reason to have the
intermediate fbdev power states for backlights (those really only can
be either off or on).
Cleanup motivated by Meghana's questions about all this.
Cc: Lee Jones <lee.jones@xxxxxxxxxx>
Cc: Daniel Thompson <daniel.thompson@xxxxxxxxxx>
Cc: Jingoo Han <jingoohan1@xxxxxxxxx>
Cc: Meghana Madhyastha <meghana.madhyastha@xxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
---
include/linux/backlight.h | 3 ---
1 file changed, 3 deletions(-)
diff --git a/include/linux/backlight.h b/include/linux/backlight.h
index af7003548593..9776edb0ff06 100644
--- a/include/linux/backlight.h
+++ b/include/linux/backlight.h
@@ -84,9 +84,6 @@ struct backlight_properties {
#define BL_CORE_SUSPENDED (1 << 0) /* backlight is suspended */
#define BL_CORE_FBBLANK (1 << 1) /* backlight is under an fb blank event */
-#define BL_CORE_DRIVER4 (1 << 28) /* reserved for driver specific use */
-#define BL_CORE_DRIVER3 (1 << 29) /* reserved for driver specific use */
-#define BL_CORE_DRIVER2 (1 << 30) /* reserved for driver specific use */
#define BL_CORE_DRIVER1 (1 << 31) /* reserved for driver specific use */
};
--
2.15.1
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