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Commit 73580fb7 authored by Jani Nikula's avatar Jani Nikula Committed by Daniel Vetter
Browse files

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: default avatarJani 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: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent ab656bb9

drivers/gpu/drm/i915/intel_dp.c

+22 −0
Original line number Diff line number Diff line
@@ -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;