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authorMichael Hanselmann <linux-kernel@hansmi.ch>2006-07-10 04:44:45 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-10 13:24:20 -0700
commite01af0384f54023b4548b7742952da2ffcafd4cd (patch)
tree6ffd14821a0a1fedbf4430c5df7fa60822f4809f /drivers/video/riva
parent58d383a6222d66be9483598c51bae34e7d3c2c37 (diff)
[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>
Diffstat (limited to 'drivers/video/riva')
-rw-r--r--drivers/video/riva/fbdev.c44
1 files changed, 30 insertions, 14 deletions
diff --git a/drivers/video/riva/fbdev.c b/drivers/video/riva/fbdev.c
index baf494cecc10..33dddbae5420 100644
--- a/drivers/video/riva/fbdev.c
+++ b/drivers/video/riva/fbdev.c
@@ -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();