From 73580fb764c4213d305c0d36bd8f856ae631eb42 Mon Sep 17 00:00:00 2001 From: Jani Nikula Date: Tue, 12 Aug 2014 17:11:41 +0300 Subject: [PATCH] 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 Reviewed_by: Clinton Taylor Tested_by: Clinton Taylor Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_dp.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index f72f4d9..1642d30 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; -- 2.7.4