drm/i915: enable/disable backlight for eDP

Like we already do for the LVDS panels. This seems to help greatly
in setting up the backlight, since the BIOS might refuse to cooperate.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Tested-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
v2: Move the backlight_off call from panel_off to edp_backlight_off,
noticed by Paulo Zanoni.

Reviewed-by: Paulo Zanoni <przanoni@gmail.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 d459cc72db64f65a42c9bf611be2ac1e0105513b..da526c9a9ceff268741daccce01a12351c5257e4 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1164,6 +1164,7 @@ static void ironlake_edp_backlight_on(struct intel_dp *intel_dp)
 {
        struct drm_device *dev = intel_dp->base.base.dev;
        struct drm_i915_private *dev_priv = dev->dev_private;
+       int pipe = to_intel_crtc(intel_dp->base.base.crtc)->pipe;
        u32 pp;
 
        if (!is_edp(intel_dp))
@@ -1181,6 +1182,8 @@ static void ironlake_edp_backlight_on(struct intel_dp *intel_dp)
        pp |= EDP_BLC_ENABLE;
        I915_WRITE(PCH_PP_CONTROL, pp);
        POSTING_READ(PCH_PP_CONTROL);
+
+       intel_panel_enable_backlight(dev, pipe);
 }
 
 static void ironlake_edp_backlight_off(struct intel_dp *intel_dp)
@@ -1192,6 +1195,8 @@ static void ironlake_edp_backlight_off(struct intel_dp *intel_dp)
        if (!is_edp(intel_dp))
                return;
 
+       intel_panel_disable_backlight(dev);
+
        DRM_DEBUG_KMS("\n");
        pp = ironlake_get_pp_control(dev_priv);
        pp &= ~EDP_BLC_ENABLE;