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WSL2-Linux-Kernel
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[PATCH] powermac: Combined fixes for backlight code 

This patch fixes several problems:
- pmac_backlight_key() is called under interrupt context, and therefore
  can't use mutexes or semaphores, so defer the backlight level for
  later, as it's not critical (original code by Aristeu S. Rozanski F.
  <aris@valeta.org>).
- Add exports for functions that might be called from modules
- Fix Kconfig depdencies on PMAC_BACKLIGHT.
- Fix locking issues on calls from inside the driver (reported by
  Aristeu S. Rozanski F., too)
- Fix wrong calculation of backlight values in some of the drivers
- Replace pmac_backlight_key_up/down by inline functions

[akpm@osdl.org: fix function prototypes]
Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch>
Acked-by: Aristeu S. Rozanski F. <aris@valeta.org>
Acked-by: Rene Nussbaumer <linux-kernel@killerfox.forkbomb.ch>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Michael Hanselmann 2006-07-10 04:44:45 -07:00 коммит произвёл Linus Torvalds
Родитель 58d383a622
Коммит e01af0384f
10 изменённых файлов: 162 добавлений и 97 удалений
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31
arch/powerpc/platforms/powermac/backlight.c
Просмотреть файл

@ -15,6 +15,15 @@
#define OLD_BACKLIGHT_MAX 15
static void pmac_backlight_key_worker(void *data);
static DECLARE_WORK(pmac_backlight_key_work, pmac_backlight_key_worker, NULL);
/* Although this variable is used in interrupt context, it makes no sense to
* protect it. No user is able to produce enough key events per second and
* notice the errors that might happen.
*/
static int pmac_backlight_key_queued;
/* Protect the pmac_backlight variable */
DEFINE_MUTEX(pmac_backlight_mutex);
@ -71,7 +80,7 @@ int pmac_backlight_curve_lookup(struct fb_info *info, int value)
return level;
}
static void pmac_backlight_key(int direction)
static void pmac_backlight_key_worker(void *data)
{
mutex_lock(&pmac_backlight_mutex);
if (pmac_backlight) {
@ -82,7 +91,8 @@ static void pmac_backlight_key(int direction)
props = pmac_backlight->props;
brightness = props->brightness +
((direction?-1:1) * (props->max_brightness / 15));
((pmac_backlight_key_queued?-1:1) *
(props->max_brightness / 15));
if (brightness < 0)
brightness = 0;
@ -97,14 +107,13 @@ static void pmac_backlight_key(int direction)
mutex_unlock(&pmac_backlight_mutex);
}
void pmac_backlight_key_up()
void pmac_backlight_key(int direction)
{
pmac_backlight_key(0);
}
void pmac_backlight_key_down()
{
pmac_backlight_key(1);
/* we can receive multiple interrupts here, but the scheduled work
* will run only once, with the last value
*/
pmac_backlight_key_queued = direction;
schedule_work(&pmac_backlight_key_work);
}
int pmac_backlight_set_legacy_brightness(int brightness)
@ -157,3 +166,7 @@ int pmac_backlight_get_legacy_brightness()
return result;
}
EXPORT_SYMBOL_GPL(pmac_backlight);
EXPORT_SYMBOL_GPL(pmac_backlight_mutex);
EXPORT_SYMBOL_GPL(pmac_has_backlight_type);

5
drivers/macintosh/Kconfig
Просмотреть файл

@ -113,7 +113,10 @@ config PMAC_MEDIABAY
config PMAC_BACKLIGHT
bool "Backlight control for LCD screens"
depends on ADB_PMU && (BROKEN || !PPC64)
depends on ADB_PMU && FB = y && (BROKEN || !PPC64)
select FB_BACKLIGHT
select BACKLIGHT_CLASS_DEVICE
select BACKLIGHT_LCD_SUPPORT
help
Say Y here to enable Macintosh specific extensions of the generic
backlight code. With this enabled, the brightness keys on older

66
drivers/video/aty/aty128fb.c
Просмотреть файл

@ -455,6 +455,7 @@ static void do_wait_for_fifo(u16 entries, struct aty128fb_par *par);
static void wait_for_fifo(u16 entries, struct aty128fb_par *par);
static void wait_for_idle(struct aty128fb_par *par);
static u32 depth_to_dst(u32 depth);
static void aty128_bl_set_power(struct fb_info *info, int power);
#define BIOS_IN8(v) (readb(bios + (v)))
#define BIOS_IN16(v) (readb(bios + (v)) | \
@ -1257,25 +1258,11 @@ static void aty128_set_lcd_enable(struct aty128fb_par *par, int on)
reg &= ~LVDS_DISPLAY_DIS;
aty_st_le32(LVDS_GEN_CNTL, reg);
#ifdef CONFIG_FB_ATY128_BACKLIGHT
mutex_lock(&info->bl_mutex);
if (info->bl_dev) {
down(&info->bl_dev->sem);
info->bl_dev->props->update_status(info->bl_dev);
up(&info->bl_dev->sem);
}
mutex_unlock(&info->bl_mutex);
aty128_bl_set_power(info, FB_BLANK_UNBLANK);
#endif
} else {
#ifdef CONFIG_FB_ATY128_BACKLIGHT
mutex_lock(&info->bl_mutex);
if (info->bl_dev) {
down(&info->bl_dev->sem);
info->bl_dev->props->brightness = 0;
info->bl_dev->props->power = FB_BLANK_POWERDOWN;
info->bl_dev->props->update_status(info->bl_dev);
up(&info->bl_dev->sem);
}
mutex_unlock(&info->bl_mutex);
aty128_bl_set_power(info, FB_BLANK_POWERDOWN);
#endif
reg = aty_ld_le32(LVDS_GEN_CNTL);
reg |= LVDS_DISPLAY_DIS;
@ -1702,6 +1689,7 @@ static int __devinit aty128fb_setup(char *options)
static struct backlight_properties aty128_bl_data;
/* Call with fb_info->bl_mutex held */
static int aty128_bl_get_level_brightness(struct aty128fb_par *par,
int level)
{
@ -1709,10 +1697,8 @@ static int aty128_bl_get_level_brightness(struct aty128fb_par *par,
int atylevel;
/* Get and convert the value */
mutex_lock(&info->bl_mutex);
atylevel = MAX_LEVEL -
(info->bl_curve[level] * FB_BACKLIGHT_MAX / MAX_LEVEL);
mutex_unlock(&info->bl_mutex);
if (atylevel < 0)
atylevel = 0;
@ -1730,7 +1716,8 @@ static int aty128_bl_get_level_brightness(struct aty128fb_par *par,
/* That one prevents proper CRT output with LCD off */
#undef BACKLIGHT_DAC_OFF
static int aty128_bl_update_status(struct backlight_device *bd)
/* Call with fb_info->bl_mutex held */
static int __aty128_bl_update_status(struct backlight_device *bd)
{
struct aty128fb_par *par = class_get_devdata(&bd->class_dev);
unsigned int reg = aty_ld_le32(LVDS_GEN_CNTL);
@ -1783,6 +1770,19 @@ static int aty128_bl_update_status(struct backlight_device *bd)
return 0;
}
static int aty128_bl_update_status(struct backlight_device *bd)
{
struct aty128fb_par *par = class_get_devdata(&bd->class_dev);
struct fb_info *info = pci_get_drvdata(par->pdev);
int ret;
mutex_lock(&info->bl_mutex);
ret = __aty128_bl_update_status(bd);
mutex_unlock(&info->bl_mutex);
return ret;
}
static int aty128_bl_get_brightness(struct backlight_device *bd)
{
return bd->props->brightness;
@ -1795,6 +1795,16 @@ static struct backlight_properties aty128_bl_data = {
.max_brightness = (FB_BACKLIGHT_LEVELS - 1),
};
static void aty128_bl_set_power(struct fb_info *info, int power)
{
mutex_lock(&info->bl_mutex);
up(&info->bl_dev->sem);
info->bl_dev->props->power = power;
__aty128_bl_update_status(info->bl_dev);
down(&info->bl_dev->sem);
mutex_unlock(&info->bl_mutex);
}
static void aty128_bl_init(struct aty128fb_par *par)
{
struct fb_info *info = pci_get_drvdata(par->pdev);
@ -2197,12 +2207,8 @@ static int aty128fb_blank(int blank, struct fb_info *fb)
return 0;
#ifdef CONFIG_FB_ATY128_BACKLIGHT
if (machine_is(powermac) && blank) {
down(&fb->bl_dev->sem);
fb->bl_dev->props->power = FB_BLANK_POWERDOWN;
fb->bl_dev->props->update_status(fb->bl_dev);
up(&fb->bl_dev->sem);
}
if (machine_is(powermac) && blank)
aty128_bl_set_power(fb, FB_BLANK_POWERDOWN);
#endif
if (blank & FB_BLANK_VSYNC_SUSPEND)
@ -2218,14 +2224,12 @@ static int aty128fb_blank(int blank, struct fb_info *fb)
aty128_set_crt_enable(par, par->crt_on && !blank);
aty128_set_lcd_enable(par, par->lcd_on && !blank);
}
#ifdef CONFIG_FB_ATY128_BACKLIGHT
if (machine_is(powermac) && !blank) {
down(&fb->bl_dev->sem);
fb->bl_dev->props->power = FB_BLANK_UNBLANK;
fb->bl_dev->props->update_status(fb->bl_dev);
up(&fb->bl_dev->sem);
}
if (machine_is(powermac) && !blank)
aty128_bl_set_power(fb, FB_BLANK_UNBLANK);
#endif
return 0;
}

53
drivers/video/aty/atyfb_base.c
Просмотреть файл

@ -2129,15 +2129,14 @@ static int atyfb_pci_resume(struct pci_dev *pdev)
static struct backlight_properties aty_bl_data;
/* Call with fb_info->bl_mutex held */
static int aty_bl_get_level_brightness(struct atyfb_par *par, int level)
{
struct fb_info *info = pci_get_drvdata(par->pdev);
int atylevel;
/* Get and convert the value */
mutex_lock(&info->bl_mutex);
atylevel = info->bl_curve[level] * FB_BACKLIGHT_MAX / MAX_LEVEL;
mutex_unlock(&info->bl_mutex);
if (atylevel < 0)
atylevel = 0;
@ -2147,7 +2146,8 @@ static int aty_bl_get_level_brightness(struct atyfb_par *par, int level)
return atylevel;
}
static int aty_bl_update_status(struct backlight_device *bd)
/* Call with fb_info->bl_mutex held */
static int __aty_bl_update_status(struct backlight_device *bd)
{
struct atyfb_par *par = class_get_devdata(&bd->class_dev);
unsigned int reg = aty_ld_lcd(LCD_MISC_CNTL, par);
@ -2172,6 +2172,19 @@ static int aty_bl_update_status(struct backlight_device *bd)
return 0;
}
static int aty_bl_update_status(struct backlight_device *bd)
{
struct atyfb_par *par = class_get_devdata(&bd->class_dev);
struct fb_info *info = pci_get_drvdata(par->pdev);
int ret;
mutex_lock(&info->bl_mutex);
ret = __aty_bl_update_status(bd);
mutex_unlock(&info->bl_mutex);
return ret;
}
static int aty_bl_get_brightness(struct backlight_device *bd)
{
return bd->props->brightness;
@ -2184,6 +2197,16 @@ static struct backlight_properties aty_bl_data = {
.max_brightness = (FB_BACKLIGHT_LEVELS - 1),
};
static void aty_bl_set_power(struct fb_info *info, int power)
{
mutex_lock(&info->bl_mutex);
up(&info->bl_dev->sem);
info->bl_dev->props->power = power;
__aty_bl_update_status(info->bl_dev);
down(&info->bl_dev->sem);
mutex_unlock(&info->bl_mutex);
}
static void aty_bl_init(struct atyfb_par *par)
{
struct fb_info *info = pci_get_drvdata(par->pdev);
@ -2790,16 +2813,8 @@ static int atyfb_blank(int blank, struct fb_info *info)
return 0;
#ifdef CONFIG_PMAC_BACKLIGHT
if (machine_is(powermac) && blank > FB_BLANK_NORMAL) {
mutex_lock(&info->bl_mutex);
if (info->bl_dev) {
down(&info->bl_dev->sem);
info->bl_dev->props->power = FB_BLANK_POWERDOWN;
info->bl_dev->props->update_status(info->bl_dev);
up(&info->bl_dev->sem);
}
mutex_unlock(&info->bl_mutex);
}
if (machine_is(powermac) && blank > FB_BLANK_NORMAL)
aty_bl_set_power(info, FB_BLANK_POWERDOWN);
#elif defined(CONFIG_FB_ATY_GENERIC_LCD)
if (par->lcd_table && blank > FB_BLANK_NORMAL &&
(aty_ld_lcd(LCD_GEN_CNTL, par) & LCD_ON)) {
@ -2830,16 +2845,8 @@ static int atyfb_blank(int blank, struct fb_info *info)
aty_st_le32(CRTC_GEN_CNTL, gen_cntl, par);
#ifdef CONFIG_PMAC_BACKLIGHT
if (machine_is(powermac) && blank <= FB_BLANK_NORMAL) {
mutex_lock(&info->bl_mutex);
if (info->bl_dev) {
down(&info->bl_dev->sem);
info->bl_dev->props->power = FB_BLANK_UNBLANK;
info->bl_dev->props->update_status(info->bl_dev);
up(&info->bl_dev->sem);
}
mutex_unlock(&info->bl_mutex);
}
if (machine_is(powermac) && blank <= FB_BLANK_NORMAL)
aty_bl_set_power(info, FB_BLANK_UNBLANK);
#elif defined(CONFIG_FB_ATY_GENERIC_LCD)
if (par->lcd_table && blank <= FB_BLANK_NORMAL &&
(aty_ld_lcd(LCD_GEN_CNTL, par) & LCD_ON)) {

3
drivers/video/chipsfb.c
Просмотреть файл

@ -149,12 +149,11 @@ static int chipsfb_blank(int blank, struct fb_info *info)
mutex_lock(&pmac_backlight_mutex);
if (pmac_backlight) {
down(&pmac_backlight->sem);
/* used to disable backlight only for blank > 1, but it seems
* useful at blank = 1 too (saves battery, extends backlight
* life)
*/
down(&pmac_backlight->sem);
if (blank)
pmac_backlight->props->power = FB_BLANK_POWERDOWN;
else

32
drivers/video/nvidia/nv_backlight.c
Просмотреть файл

@ -26,9 +26,11 @@
*/
#define MIN_LEVEL 0x158
#define MAX_LEVEL 0x534
#define LEVEL_STEP ((MAX_LEVEL - MIN_LEVEL) / FB_BACKLIGHT_MAX)
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)
{
@ -36,9 +38,7 @@ static int nvidia_bl_get_level_brightness(struct nvidia_par *par,
int nlevel;
/* Get and convert the value */
mutex_lock(&info->bl_mutex);
nlevel = info->bl_curve[level] * FB_BACKLIGHT_MAX / MAX_LEVEL;
mutex_unlock(&info->bl_mutex);
nlevel = MIN_LEVEL + info->bl_curve[level] * LEVEL_STEP;
if (nlevel < 0)
nlevel = 0;
@ -50,7 +50,8 @@ static int nvidia_bl_get_level_brightness(struct nvidia_par *par,
return nlevel;
}
static int nvidia_bl_update_status(struct backlight_device *bd)
/* Call with fb_info->bl_mutex held */
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;
@ -84,6 +85,19 @@ 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;
@ -96,6 +110,16 @@ static struct backlight_properties nvidia_bl_data = {
.max_brightness = (FB_BACKLIGHT_LEVELS - 1),
};
void nvidia_bl_set_power(struct fb_info *info, int power)
{
mutex_lock(&info->bl_mutex);
up(&info->bl_dev->sem);
info->bl_dev->props->power = power;
__nvidia_bl_update_status(info->bl_dev);
down(&info->bl_dev->sem);
mutex_unlock(&info->bl_mutex);
}
void nvidia_bl_init(struct nvidia_par *par)
{
struct fb_info *info = pci_get_drvdata(par->pci_dev);

2
drivers/video/nvidia/nv_proto.h
Просмотреть файл

@ -68,9 +68,11 @@ extern u8 byte_rev[256];
#ifdef CONFIG_FB_NVIDIA_BACKLIGHT
extern void nvidia_bl_init(struct nvidia_par *par);
extern void nvidia_bl_exit(struct nvidia_par *par);
extern void nvidia_bl_set_power(struct fb_info *info, int power);
#else
static inline void nvidia_bl_init(struct nvidia_par *par) {}
static inline void nvidia_bl_exit(struct nvidia_par *par) {}
static inline void nvidia_bl_set_power(struct fb_info *info, int power) {}
#endif
#endif /* __NV_PROTO_H__ */

11
drivers/video/nvidia/nvidia.c
Просмотреть файл

@ -932,16 +932,7 @@ static int nvidiafb_blank(int blank, struct fb_info *info)
NVWriteSeq(par, 0x01, tmp);
NVWriteCrtc(par, 0x1a, vesa);
#ifdef CONFIG_FB_NVIDIA_BACKLIGHT
mutex_lock(&info->bl_mutex);
if (info->bl_dev) {
down(&info->bl_dev->sem);
info->bl_dev->props->power = blank;
info->bl_dev->props->update_status(info->bl_dev);
up(&info->bl_dev->sem);
}
mutex_unlock(&info->bl_mutex);
#endif
nvidia_bl_set_power(info, blank);
NVTRACE_LEAVE();

44
drivers/video/riva/fbdev.c
Просмотреть файл

@ -277,9 +277,11 @@ static const struct riva_regs reg_template = {
*/
#define MIN_LEVEL 0x158
#define MAX_LEVEL 0x534
#define LEVEL_STEP ((MAX_LEVEL - MIN_LEVEL) / FB_BACKLIGHT_MAX)
static struct backlight_properties riva_bl_data;
/* Call with fb_info->bl_mutex held */
static int riva_bl_get_level_brightness(struct riva_par *par,
int level)
{
@ -287,9 +289,7 @@ static int riva_bl_get_level_brightness(struct riva_par *par,
int nlevel;
/* Get and convert the value */
mutex_lock(&info->bl_mutex);
nlevel = info->bl_curve[level] * FB_BACKLIGHT_MAX / MAX_LEVEL;
mutex_unlock(&info->bl_mutex);
nlevel = MIN_LEVEL + info->bl_curve[level] * LEVEL_STEP;
if (nlevel < 0)
nlevel = 0;
@ -301,7 +301,8 @@ static int riva_bl_get_level_brightness(struct riva_par *par,
return nlevel;
}
static int riva_bl_update_status(struct backlight_device *bd)
/* Call with fb_info->bl_mutex held */
static int __riva_bl_update_status(struct backlight_device *bd)
{
struct riva_par *par = class_get_devdata(&bd->class_dev);
U032 tmp_pcrt, tmp_pmc;
@ -326,6 +327,19 @@ static int riva_bl_update_status(struct backlight_device *bd)
return 0;
}
static int riva_bl_update_status(struct backlight_device *bd)
{
struct riva_par *par = class_get_devdata(&bd->class_dev);
struct fb_info *info = pci_get_drvdata(par->pdev);
int ret;
mutex_lock(&info->bl_mutex);
ret = __riva_bl_update_status(bd);
mutex_unlock(&info->bl_mutex);
return ret;
}
static int riva_bl_get_brightness(struct backlight_device *bd)
{
return bd->props->brightness;
@ -338,6 +352,16 @@ static struct backlight_properties riva_bl_data = {
.max_brightness = (FB_BACKLIGHT_LEVELS - 1),
};
static void riva_bl_set_power(struct fb_info *info, int power)
{
mutex_lock(&info->bl_mutex);
up(&info->bl_dev->sem);
info->bl_dev->props->power = power;
__riva_bl_update_status(info->bl_dev);
down(&info->bl_dev->sem);
mutex_unlock(&info->bl_mutex);
}
static void riva_bl_init(struct riva_par *par)
{
struct fb_info *info = pci_get_drvdata(par->pdev);
@ -418,6 +442,7 @@ static void riva_bl_exit(struct riva_par *par)
#else
static inline void riva_bl_init(struct riva_par *par) {}
static inline void riva_bl_exit(struct riva_par *par) {}
static inline void riva_bl_set_power(struct fb_info *info, int power) {}
#endif /* CONFIG_FB_RIVA_BACKLIGHT */
/* ------------------------------------------------------------------------- *
@ -1336,16 +1361,7 @@ static int rivafb_blank(int blank, struct fb_info *info)
SEQout(par, 0x01, tmp);
CRTCout(par, 0x1a, vesa);
#ifdef CONFIG_FB_RIVA_BACKLIGHT
mutex_lock(&info->bl_mutex);
if (info->bl_dev) {
down(&info->bl_dev->sem);
info->bl_dev->props->power = blank;
info->bl_dev->props->update_status(info->bl_dev);
up(&info->bl_dev->sem);
}
mutex_unlock(&info->bl_mutex);
#endif
riva_bl_set_power(info, blank);
NVTRACE_LEAVE();

12
include/asm-powerpc/backlight.h
Просмотреть файл

@ -16,13 +16,19 @@
extern struct backlight_device *pmac_backlight;
extern struct mutex pmac_backlight_mutex;
extern void pmac_backlight_calc_curve(struct fb_info*);
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_up(void);
extern void pmac_backlight_key_down(void);
extern void pmac_backlight_key(int direction);
static inline void pmac_backlight_key_up(void)
{
pmac_backlight_key(0);
}
static inline void pmac_backlight_key_down(void)
{
pmac_backlight_key(1);
}
extern int pmac_backlight_set_legacy_brightness(int brightness);
extern int pmac_backlight_get_legacy_brightness(void);