kernel/linux.git/drivers/video/fbdev/core/fb_info.c, branch v6.18.22

fbdev: Track display blanking state

2025-04-10T09:38:57+00:00

Store the display's blank status in struct fb_info.blank and track it in fb_blank(). As an extra, the status is now available from the sysfs blank attribute. Support for blanking is optional. Therefore framebuffer_alloc() initializes the state to FB_BLANK_UNBLANK (i.e., the display is on). If the fb_blank callback has been set, register_framebuffer() sets the state to FB_BLANK_POWERDOWN. On the first modeset, the call to fb_blank() will update it to _UNBLANK. This is important, as listeners to FB_EVENT_BLANK will now see the display being switched on. Signed-off-by: Thomas Zimmermann Acked-by: Simona Vetter Link: https://lore.kernel.org/r/20250321095517.313713-3-tzimmermann@suse.de Signed-off-by: Lee Jones

fbdev: Document that framebuffer_alloc() returns zero'ed data

2023-07-24T14:50:39+00:00

Most fbdev drivers depend on framebuffer_alloc() to initialize the allocated memory to 0. Document this guarantee. v3: * slightly reword the sentence (Miguel) Suggested-by: Miguel Ojeda Signed-off-by: Thomas Zimmermann Reviewed-by: Miguel Ojeda Reviewed-by: Sui Jingfeng Cc: Helge Deller Link: https://patchwork.freedesktop.org/patch/msgid/20230715185343.7193-19-tzimmermann@suse.de

fbdev/core: Move framebuffer and backlight helpers into separate files

2023-06-27T07:58:51+00:00

Move framebuffer and backlight helpers into separate files. Leave fbsysfs.c to sysfs-related code. No functional changes. The framebuffer helpers are not in fbmem.c because they are under GPL-2.0-or-later copyright, while fbmem.c is GPL-2.0. v2: * include (Sam) Signed-off-by: Thomas Zimmermann Reviewed-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20230613110953.24176-34-tzimmermann@suse.de