diff options
| author | Matthew Garrett <mjg@redhat.com> | 2010-02-16 16:53:50 -0500 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2010-03-14 16:06:37 -0400 |
| commit | 70287db87cfc968fe78bf82a489833cc77b84352 (patch) | |
| tree | f4863a415e684c83bda0ea93655640a388c984fd /drivers/acpi/video.c | |
| parent | f8b55f251012e104093e105483c45c5d85ad3040 (diff) | |
| download | linux-70287db87cfc968fe78bf82a489833cc77b84352.tar.bz2 | |
ACPI video: Be more liberal in validating _BQC behaviour
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>
Diffstat (limited to 'drivers/acpi/video.c')
| -rw-r--r-- | drivers/acpi/video.c | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index b765790b32be..ea314a2ecd12 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -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; |