This is a note to let you know that I've just added the patch titled
arch/powerpc: Remove <linux/fb.h> from backlight code
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arch-powerpc-remove-linux-fb.h-from-backlight-code.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 76ee4e092c22f0635b212796bbbc97682f97ce25
Author: Thomas Zimmermann <tzimmermann@xxxxxxx>
Date: Wed Mar 6 13:28:20 2024 +0100
arch/powerpc: Remove <linux/fb.h> from backlight code
[ Upstream commit 838f865802b9f26135ea7df4e30f89ac2f50c23e ]
Replace <linux/fb.h> with a forward declaration in <asm/backlight.h> to
resolve an unnecessary dependency. Remove pmac_backlight_curve_lookup()
and struct fb_info from source and header files. The function and the
framebuffer struct are unused. No functional changes.
v3:
* Add Fixes tag (Christophe)
* fix typos in commit message (Jani)
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Fixes: d565dd3b0824 ("[PATCH] powerpc: More via-pmu backlight fixes")
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> # (powerpc)
Link: https://patchwork.freedesktop.org/patch/msgid/20240306122935.10626-4-tzimmermann@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/powerpc/include/asm/backlight.h b/arch/powerpc/include/asm/backlight.h
index 1b5eab62ed047..061a910d74929 100644
--- a/arch/powerpc/include/asm/backlight.h
+++ b/arch/powerpc/include/asm/backlight.h
@@ -10,15 +10,14 @@
#define __ASM_POWERPC_BACKLIGHT_H
#ifdef __KERNEL__
-#include <linux/fb.h>
#include <linux/mutex.h>
+struct backlight_device;
+
/* For locking instructions, see the implementation file */
extern struct backlight_device *pmac_backlight;
extern struct mutex pmac_backlight_mutex;
-extern int pmac_backlight_curve_lookup(struct fb_info *info, int value);
-
extern int pmac_has_backlight_type(const char *type);
extern void pmac_backlight_key(int direction);
diff --git a/arch/powerpc/platforms/powermac/backlight.c b/arch/powerpc/platforms/powermac/backlight.c
index 32224cb489d75..eab339d2059d5 100644
--- a/arch/powerpc/platforms/powermac/backlight.c
+++ b/arch/powerpc/platforms/powermac/backlight.c
@@ -9,7 +9,6 @@
*/
#include <linux/kernel.h>
-#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/adb.h>
#include <linux/pmu.h>
@@ -73,31 +72,6 @@ int pmac_has_backlight_type(const char *type)
return 0;
}
-int pmac_backlight_curve_lookup(struct fb_info *info, int value)
-{
- int level = (FB_BACKLIGHT_LEVELS - 1);
-
- if (info && info->bl_dev) {
- int i, max = 0;
-
- /* Look for biggest value */
- for (i = 0; i < FB_BACKLIGHT_LEVELS; i++)
- max = max((int)info->bl_curve[i], max);
-
- /* Look for nearest value */
- for (i = 0; i < FB_BACKLIGHT_LEVELS; i++) {
- int diff = abs(info->bl_curve[i] - value);
- if (diff < max) {
- max = diff;
- level = i;
- }
- }
-
- }
-
- return level;
-}
-
static void pmac_backlight_key_worker(struct work_struct *work)
{
if (atomic_read(&kernel_backlight_disabled))
