diff options
| author |   Ville Syrjälä <ville.syrjala@linux.intel.com> | 2014-11-07 15:18:45 +0200 |
|---|---|---|
| committer |   Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-11-14 10:29:19 +0100 |
| commit | 2d72f6c7be9cd26485f88961f6a56fae3d9d17e9 (patch) | |
| tree | 60b58af15ee2d193825f59262a2a367287191b94 /include/linux/pps_kernel.h | |
| parent | drm/i915: Warn if trying to poke a VLV backlight on invalid pipe (diff) | |
drm/i915: Skip .get_backlight() when backlight isn't enabled
On VLV/CHV when the display is off, we can't read out the current
backlight level from the hardware since we have no pipe to do so.
Currently we end up reading a bigus register due to passing
INVALID_PIPE to VLV_BLC_PWM_CTL().
Skip the entire .get_backlight() call if the backlight isn't enabled
according to backlight.enabled.
This problem can be reproduced simply by reading the backlight device
actual_brightness file while the display is off.
Cc: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'include/linux/pps_kernel.h')
0 files changed, 0 insertions, 0 deletions