* Framebuffer Subsystem (fbdev):
* The display's blanking status is now tracked in `struct fb_info`
* `framebuffer_alloc()` initializes the blank state to `FB_BLANK_UNBLANK`
* `register_framebuffer()` sets the state to `FB_BLANK_POWERDOWN` if an `fb_blank`
callback exists, ensuring `FB_EVENT_BLANK` listeners correctly see the display
being turned on during the first modeset
* The `FB_EVENT_BLANK` event data now includes both the new and the old blank states
* Qualcomm WLED Backlight:
* Added a NULL check after `devm_kasprintf()` in `wled_configure()` to prevent a
potential NULL pointer dereference if memory allocation fails
* Framebuffer Subsystem (fbdev):
* `fb_blank()` has been reworked to return early on errors, without functional
changes, in preparation for further state tracking improvements
* Fbdev now calls dedicated functions in the backlight subsystems to notify them
of blank state changes, instead of relying on fbdev event notifiers
* For LCDs, fbdev also calls a dedicated function to notify of mode changes
* Backlight Subsystem:
* Implemented fbdev blank state tracking using the (newly enhanced) blank state
information provided directly by `FB_EVENT_BLANK`
* Removed internal blank state tracking fields (`fb_bl_on`) from
`struct backlight_device`
* Moved the handling of blank-state updates into a separate internal helper
function, `backlight_notify_blank()`
* Removed support for fbdev events and replaced it with a dedicated function call
interface (`backlight_notify_blank()` and `backlight_notify_blank_all()`) for
display drivers to update backlight status
* LCD Subsystem:
* Moved the handling of display updates (blank events and mode changes) from
fbdev event notifiers to separate internal helper functions (`lcd_notify_blank`,
`lcd_notify_mode_change`)
* Removed support for fbdev events and replaced it with dedicated function call
interfaces (`lcd_notify_blank_all()`, `lcd_notify_mode_change_all()`)
* The LCD subsystem now maintains its own internal list of LCD devices instead of
relying on fbdev notifiers
* LED Backlight Trigger:
* Moved the handling of blank-state updates into a separate internal helper,
`ledtrig_backlight_notify_blank()`
* Removed support for fbdev events and replaced it with a dedicated function call,
`ledtrig_backlight_blank()`, for fbdev to notify trigger of blank state changes
* The LED backlight trigger now maintains its own internal list of triggers
instead of relying on fbdev notifiers
* Framebuffer Subsystem (fbdev):
* Removed the definitions for the unused fbdev event constants
`FB_EVENT_MODE_CHANGE` and `FB_EVENT_BLANK` from the header file
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Merge tag 'backlight-next-6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight
Pull backlight updates from Lee Jones:
"Framebuffer Subsystem (fbdev):
- The display's blanking status is now tracked in 'struct fb_info'
- 'framebuffer_alloc()' initializes the blank state to FB_BLANK_UNBLANK
- 'register_framebuffer()' sets the state to 'FB_BLANK_POWERDOWN' if
an 'fb_blank' callback exists, ensuring 'FB_EVENT_BLANK' listeners
correctly see the display being turned on during the first modeset
- The 'FB_EVENT_BLANK' event data now includes both the new and the
old blank states
- 'fb_blank()' has been reworked to return early on errors, without
functional changes, in preparation for further state tracking
improvements
- Fbdev now calls dedicated functions in the backlight subsystems to
notify them of blank state changes, instead of relying on fbdev
event notifiers
- For LCDs, fbdev also calls a dedicated function to notify of mode
changes
- Removed the definitions for the unused fbdev event constants
'FB_EVENT_MODE_CHANGE' and 'FB_EVENT_BLANK' from the header file
Backlight Subsystem:
- Implemented fbdev blank state tracking using the (newly enhanced)
blank state information provided directly by 'FB_EVENT_BLANK'
- Removed internal blank state tracking fields ('fb_bl_on') from
'struct backlight_device'
- Moved the handling of blank-state updates into a separate internal
helper function, 'backlight_notify_blank()'
- Removed support for fbdev events and replaced it with a dedicated
function call interface ('backlight_notify_blank()' and
'backlight_notify_blank_all()') for display drivers to update
backlight status
LCD Subsystem:
- Moved the handling of display updates (blank events and mode
changes) from fbdev event notifiers to separate internal helper
functions ('lcd_notify_blank',
'lcd_notify_mode_change')
- Removed support for fbdev events and replaced it with dedicated
function call interfaces ('lcd_notify_blank_all()',
'lcd_notify_mode_change_all()')
- The LCD subsystem now maintains its own internal list of LCD
devices instead of relying on fbdev notifiers
LED Backlight Trigger:
- Moved the handling of blank-state updates into a separate internal
helper, 'ledtrig_backlight_notify_blank()'
- Removed support for fbdev events and replaced it with a dedicated
function call, 'ledtrig_backlight_blank()', for fbdev to notify
trigger of blank state changes
- The LED backlight trigger now maintains its own internal list of
triggers instead of relying on fbdev notifiers
Qualcomm WLED Backlight:
- Added a NULL check after 'devm_kasprintf()' in 'wled_configure()'
to prevent a potential NULL pointer dereference if memory
allocation fails"
* tag 'backlight-next-6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight:
backlight: pm8941: Add NULL check in wled_configure()
fbdev: Remove constants of unused events
leds: backlight trigger: Replace fb events with a dedicated function call
leds: backlight trigger: Move blank-state handling into helper
backlight: lcd: Replace fb events with a dedicated function call
backlight: lcd: Move event handling into helpers
backlight: Replace fb events with a dedicated function call
backlight: Move blank-state handling into helper
backlight: Implement fbdev tracking with blank state from event
fbdev: Send old blank state in FB_EVENT_BLANK
fbdev: Track display blanking state
fbdev: Rework fb_blank()
a9dfb7db96