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ACPI video: Be more liberal in validating _BQC behaviour

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Right now, if _BQC returns a value we don't understand we immediately
invalidate it. Change this behaviour so we only invalidate it if it
continues to give an invalid answer after we've already set a brightness.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Matthew Garrett 2010-02-16 16:53:50 -05:00 committed by Len Brown
parent f8b55f2510
commit 70287db87c
1 changed files with 17 additions and 11 deletions
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28
drivers/acpi/video.c
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@ -327,7 +327,7 @@ static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
int level);
static int acpi_video_device_lcd_get_level_current(
struct acpi_video_device *device,
unsigned long long *level);
unsigned long long *level, int init);
static int acpi_video_get_next_level(struct acpi_video_device *device,
u32 level_current, u32 event);
static int acpi_video_switch_brightness(struct acpi_video_device *device,
@ -345,7 +345,7 @@ static int acpi_video_get_brightness(struct backlight_device *bd)
struct acpi_video_device *vd =
(struct acpi_video_device *)bl_get_data(bd);
if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
if (acpi_video_device_lcd_get_level_current(vd, &cur_level, 0))
return -EINVAL;
for (i = 2; i < vd->brightness->count; i++) {
if (vd->brightness->levels[i] == cur_level)
@ -414,7 +414,7 @@ static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsig
unsigned long long level;
int offset;
if (acpi_video_device_lcd_get_level_current(video, &level))
if (acpi_video_device_lcd_get_level_current(video, &level, 0))
return -EINVAL;
for (offset = 2; offset < video->brightness->count; offset++)
if (level == video->brightness->levels[offset]) {
@ -609,7 +609,7 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
static int
acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
unsigned long long *level)
unsigned long long *level, int init)
{
acpi_status status = AE_OK;
int i;
@ -633,10 +633,16 @@ acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
device->brightness->curr = *level;
return 0;
}
/* BQC returned an invalid level. Stop using it. */
ACPI_WARNING((AE_INFO, "%s returned an invalid level",
buf));
device->cap._BQC = device->cap._BCQ = 0;
if (!init) {
/*
* BQC returned an invalid level.
* Stop using it.
*/
ACPI_WARNING((AE_INFO,
"%s returned an invalid level",
buf));
device->cap._BQC = device->cap._BCQ = 0;
}
} else {
/* Fixme:
* should we return an error or ignore this failure?
@ -892,7 +898,7 @@ acpi_video_init_brightness(struct acpi_video_device *device)
if (!device->cap._BQC)
goto set_level;
result = acpi_video_device_lcd_get_level_current(device, &level_old);
result = acpi_video_device_lcd_get_level_current(device, &level_old, 1);
if (result)
goto out_free_levels;
@ -903,7 +909,7 @@ acpi_video_init_brightness(struct acpi_video_device *device)
if (result)
goto out_free_levels;
result = acpi_video_device_lcd_get_level_current(device, &level);
result = acpi_video_device_lcd_get_level_current(device, &level, 0);
if (result)
goto out_free_levels;
@ -1996,7 +2002,7 @@ acpi_video_switch_brightness(struct acpi_video_device *device, int event)
goto out;
result = acpi_video_device_lcd_get_level_current(device,
&level_current);
&level_current, 0);
if (result)
goto out;