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>
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@ -1453,6 +1453,27 @@ void intel_edp_backlight_off(struct intel_dp *intel_dp)
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intel_panel_disable_backlight(intel_dp->attached_connector);
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}
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/*
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* Hook for controlling the panel power control backlight through the bl_power
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* sysfs attribute. Take care to handle multiple calls.
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*/
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static void intel_edp_backlight_power(struct intel_connector *connector,
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bool enable)
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{
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struct intel_dp *intel_dp = intel_attached_dp(&connector->base);
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bool is_enabled = ironlake_get_pp_control(intel_dp) & EDP_BLC_ENABLE;
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if (is_enabled == enable)
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return;
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DRM_DEBUG_KMS("\n");
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if (enable)
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_intel_edp_backlight_on(intel_dp);
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else
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_intel_edp_backlight_off(intel_dp);
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}
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static void ironlake_edp_pll_on(struct intel_dp *intel_dp)
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{
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struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
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@ -4601,6 +4622,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
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}
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intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
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intel_connector->panel.backlight_power = intel_edp_backlight_power;
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intel_panel_setup_backlight(connector);
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return true;
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