[PATCH v3 00/11] backlight, lcd, led: Remove fbdev dependencies

[Thomas Zimmermann]

Hi

Am 13.03.25 um 17:51 schrieb Lee Jones:
> On Thu, 06 Mar 2025, Thomas Zimmermann wrote:
>
>> This series removes the remaining dependencies on fbdev from the
>> backlight, lcd and led subsystems. Each depends on fbdev events to
>> track display state. Make fbdev inform each subsystem via a dedicated
>> interface instead.
>>
>> Patches 1 to 3 make fbdev track blank state for each display, so that
>> backlight code doesn't have to.
>>
>> Patches 4 to 6 remove fbdev event handling from backlight code. Patches
>> 7 and 8 remove fbdev event handling from lcd code and patches 9 and 10
>> do the same for led's backlight trigger.
>>
>> The final patch removes the event constants from fbdev.
>>
>> With the series applied, the three subsystems do no longer depend on
>> fbdev. It's also a clean up for fbdev. Fbdev used to send out a large
>> number of events. That mechanism has been deprecated for some time and
>> converted call to dedicated functions instead.
>>
>> Testing is very welcome, as I don't have the hardware to test this
>> series.
>>
>> v3:
>> - export several symbols
>> - static-inline declare empty placeholders
>> v2:
>> - avoid IS_REACHABLE() in source file (Lee)
>> - simplify several interfaces and helpers
>> - use lock guards
>> - initialize global lists and mutices
>>
>> Thomas Zimmermann (11):
>>    fbdev: Rework fb_blank()
>>    fbdev: Track display blanking state
>>    fbdev: Send old blank state in FB_EVENT_BLANK
>>    backlight: Implement fbdev tracking with blank state from event
>>    backlight: Move blank-state handling into helper
>>    backlight: Replace fb events with a dedicated function call
>>    backlight: lcd: Move event handling into helpers
>>    backlight: lcd: Replace fb events with a dedicated function call
>>    leds: backlight trigger: Move blank-state handling into helper
>>    leds: backlight trigger: Replace fb events with a dedicated function
>>      call
>>    fbdev: Remove constants of unused events
>>
>>   drivers/leds/trigger/ledtrig-backlight.c |  48 +++++-----
>>   drivers/video/backlight/backlight.c      |  93 +++++--------------
>>   drivers/video/backlight/lcd.c            | 108 +++++++++--------------
>>   drivers/video/fbdev/core/fb_backlight.c  |  12 +++
>>   drivers/video/fbdev/core/fb_info.c       |   1 +
>>   drivers/video/fbdev/core/fbmem.c         |  82 ++++++++++++++---
>>   drivers/video/fbdev/core/fbsysfs.c       |   8 +-
>>   include/linux/backlight.h                |  22 ++---
>>   include/linux/fb.h                       |  12 +--
>>   include/linux/lcd.h                      |  21 ++++-
>>   include/linux/leds.h                     |   6 ++
>>   11 files changed, 205 insertions(+), 208 deletions(-)
> No immediately obvious issues from the LEDs side.
>
> Still needs reviews from Backlight and fbdev.

I'm confused. Are you not the backlight maintainer?

Best regards
Thomas

>

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)