diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2014-08-12 16:11:41 +0200 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-09-03 10:54:19 +0200 |
| commit | 73580fb764c4213d305c0d36bd8f856ae631eb42 (patch) | |
| tree | f8747a2856b57584dfd85047c8fa70f3a3041b60 | |
| parent | drm/i915: add some framework for backlight bl_power support (diff) | |
| download | linux-73580fb764c4213d305c0d36bd8f856ae631eb42.tar.xz linux-73580fb764c4213d305c0d36bd8f856ae631eb42.zip | |
drm/i915/dp: make backlight bl_power control power sequencer backlight
This lets the userspace switch off the backlight using the backlight
class sysfs bl_power file. The switch is done using the power sequencer;
the backlight PWM, and everything else, remains enabled. The display
backlight won't draw power, but for maximum power savings the encoder
needs to be switched off.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed_by: Clinton Taylor <Clinton.A.Taylor@intel.com>
Tested_by: Clinton Taylor <Clinton.A.Taylor@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index f72f4d97011b..1642d3019c04 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1453,6 +1453,27 @@ void intel_edp_backlight_off(struct intel_dp *intel_dp) intel_panel_disable_backlight(intel_dp->attached_connector); } +/* + * Hook for controlling the panel power control backlight through the bl_power + * sysfs attribute. Take care to handle multiple calls. + */ +static void intel_edp_backlight_power(struct intel_connector *connector, + bool enable) +{ + struct intel_dp *intel_dp = intel_attached_dp(&connector->base); + bool is_enabled = ironlake_get_pp_control(intel_dp) & EDP_BLC_ENABLE; + + if (is_enabled == enable) + return; + + DRM_DEBUG_KMS("\n"); + + if (enable) + _intel_edp_backlight_on(intel_dp); + else + _intel_edp_backlight_off(intel_dp); +} + static void ironlake_edp_pll_on(struct intel_dp *intel_dp) { struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); @@ -4601,6 +4622,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp, } intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode); + intel_connector->panel.backlight_power = intel_edp_backlight_power; intel_panel_setup_backlight(connector); return true; |