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author | Richard Purdie <rpurdie@rpsys.net> | 2007-02-10 14:10:33 +0000 |
---|---|---|
committer | Richard Purdie <rpurdie@rpsys.net> | 2007-02-20 08:38:46 +0000 |
commit | 37ce69a57ff217a4ca0871e9ee5aa58c052b7d86 (patch) | |
tree | 21cdbb8c988eed585437bb502ca15c2998ea7fbc /drivers/video/nvidia/nv_backlight.c | |
parent | b5c6916b3118d4301dc2f8cf8d33f13e5324a3a5 (diff) | |
download | kernel_samsung_smdk4412-37ce69a57ff217a4ca0871e9ee5aa58c052b7d86.zip kernel_samsung_smdk4412-37ce69a57ff217a4ca0871e9ee5aa58c052b7d86.tar.gz kernel_samsung_smdk4412-37ce69a57ff217a4ca0871e9ee5aa58c052b7d86.tar.bz2 |
backlight: Rework backlight/fb interaction simplifying, lots
fb_info->bl_mutex is badly thought out and the backlight class doesn't
need it if the framebuffer/backlight register/unregister order is
consistent, particularly after the backlight locking fixes.
Fix the drivers to use the order:
backlight_device_register()
register_framebuffer()
unregister_framebuffer()
backlight_device_unregister()
and turn bl_mutex into a lock for the bl_curve data only.
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Diffstat (limited to 'drivers/video/nvidia/nv_backlight.c')
-rw-r--r-- | drivers/video/nvidia/nv_backlight.c | 40 |
1 files changed, 8 insertions, 32 deletions
diff --git a/drivers/video/nvidia/nv_backlight.c b/drivers/video/nvidia/nv_backlight.c index 695b6bf..2bebfee 100644 --- a/drivers/video/nvidia/nv_backlight.c +++ b/drivers/video/nvidia/nv_backlight.c @@ -30,7 +30,6 @@ static struct backlight_properties nvidia_bl_data; -/* Call with fb_info->bl_mutex held */ static int nvidia_bl_get_level_brightness(struct nvidia_par *par, int level) { @@ -38,6 +37,7 @@ static int nvidia_bl_get_level_brightness(struct nvidia_par *par, int nlevel; /* Get and convert the value */ + /* No locking of bl_curve since we read a single value */ nlevel = MIN_LEVEL + info->bl_curve[level] * LEVEL_STEP; if (nlevel < 0) @@ -50,8 +50,7 @@ static int nvidia_bl_get_level_brightness(struct nvidia_par *par, return nlevel; } -/* Call with fb_info->bl_mutex held */ -static int __nvidia_bl_update_status(struct backlight_device *bd) +static int nvidia_bl_update_status(struct backlight_device *bd) { struct nvidia_par *par = class_get_devdata(&bd->class_dev); u32 tmp_pcrt, tmp_pmc, fpcontrol; @@ -85,19 +84,6 @@ static int __nvidia_bl_update_status(struct backlight_device *bd) return 0; } -static int nvidia_bl_update_status(struct backlight_device *bd) -{ - struct nvidia_par *par = class_get_devdata(&bd->class_dev); - struct fb_info *info = pci_get_drvdata(par->pci_dev); - int ret; - - mutex_lock(&info->bl_mutex); - ret = __nvidia_bl_update_status(bd); - mutex_unlock(&info->bl_mutex); - - return ret; -} - static int nvidia_bl_get_brightness(struct backlight_device *bd) { return bd->props->brightness; @@ -133,12 +119,10 @@ void nvidia_bl_init(struct nvidia_par *par) goto error; } - mutex_lock(&info->bl_mutex); info->bl_dev = bd; fb_bl_default_curve(info, 0, 0x158 * FB_BACKLIGHT_MAX / MAX_LEVEL, 0x534 * FB_BACKLIGHT_MAX / MAX_LEVEL); - mutex_unlock(&info->bl_mutex); bd->props->brightness = nvidia_bl_data.max_brightness; bd->props->power = FB_BLANK_UNBLANK; @@ -162,25 +146,17 @@ error: void nvidia_bl_exit(struct nvidia_par *par) { struct fb_info *info = pci_get_drvdata(par->pci_dev); + struct backlight_device *bd = info->bl_dev; + if (bd) { #ifdef CONFIG_PMAC_BACKLIGHT - mutex_lock(&pmac_backlight_mutex); -#endif - - mutex_lock(&info->bl_mutex); - if (info->bl_dev) { -#ifdef CONFIG_PMAC_BACKLIGHT - if (pmac_backlight == info->bl_dev) + mutex_lock(&pmac_backlight_mutex); + if (pmac_backlight == bd) pmac_backlight = NULL; + mutex_unlock(&pmac_backlight_mutex); #endif - - backlight_device_unregister(info->bl_dev); + backlight_device_unregister(bd); printk("nvidia: Backlight unloaded\n"); } - mutex_unlock(&info->bl_mutex); - -#ifdef CONFIG_PMAC_BACKLIGHT - mutex_unlock(&pmac_backlight_mutex); -#endif } |