backlight: lcd: Add LCD_POWER_ constants for power states

Duplicate FB_BLANK_ constants as LCD_POWER_ constants in the lcd
header file. Allows lcd drivers to avoid including the fbdev header
file and removes a compile-time dependency between the two subsystems.

The new LCD_POWER_ constants have the same values as their
FB_BLANK_ counterparts. Hence semantics does not change and the lcd
drivers can be converted one by one. Each instance of FB_BLANK_UNBLANK
becomes LCD_POWER_ON, each of FB_BLANK_POWERDOWN becomes LCD_POWER_OFF,
FB_BLANK_NORMAL becomes LCD_POWER_REDUCED and FB_BLANK_VSYNC_SUSPEND
becomes LCD_POWER_REDUCED_VSYNC_SUSPEND.

Lcd code or drivers do not use FB_BLANK_HSYNC_SUSPEND, so no
new constants for this is being added. The tokens LCD_POWER_REDUCED
and LCD_POWER_REDUCED_VSYNC_SUSPEND are deprecated and drivers should
replace them with LCD_POWER_ON and LCD_POWER_OFF.

See also commit a1cacb8a8e ("backlight: Add BACKLIGHT_POWER_ constants
for power states"), which added similar constants for backlight drivers.

v2:
- fix typo in commit description

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20240906075439.98476-4-tzimmermann@suse.de
Signed-off-by: Lee Jones <lee@kernel.org>

This commit is contained in:

Thomas Zimmermann

2024-09-06 09:52:17 +02:00

committed by

Lee Jones

parent 26228256b7

commit 48ffe2074c

2 changed files with 26 additions and 1 deletions

									
										include/linux/lcd.h
									
		+5
		
												View File
												
				@@ -14,6 +14,11 @@

				#include <linux/notifier.h>

				#include <linux/fb.h>

				#define LCD_POWER_ON			(0)

				#define LCD_POWER_REDUCED		(1) // deprecated; don't use in new code

				#define LCD_POWER_REDUCED_VSYNC_SUSPEND	(2) // deprecated; don't use in new code

				#define LCD_POWER_OFF			(4)

				/* Notes on locking:

				 *

				 * lcd_device->ops_lock is an internal backlight lock protecting the ops