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>

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index f72f4d97011bf56ad7f341128eaac27a67886084..1642d3019c042d6d147d0236f27de3564886124d 100644 (file)
--- 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;