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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>
This commit is contained in:
Jani Nikula 2014-08-12 17:11:41 +03:00 committed by Daniel Vetter
parent ab656bb901
commit 73580fb764
1 changed files with 22 additions and 0 deletions
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22
drivers/gpu/drm/i915/intel_dp.c
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@ -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;