[Intel-gfx] [PATCH] drm/i915: Don't just say it, actually force edp vdd

[Patrik Jakobsson]

This solves the blank screen problem on the MacBook Air 6,2. The
comments state that we need to force edp vdd so lets put it back. The
EDP_FORCE_VDD bit was removed in commit:

commit dff392dbd258381a6c3164f38420593f2d291e3b
drm/i915: don't touch the VDD when disabling the panel
    
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=74628
Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson at gmail.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 57552eb..44de6f7 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1252,7 +1252,7 @@ void ironlake_edp_panel_off(struct intel_dp *intel_dp)
 	pp = ironlake_get_pp_control(intel_dp);
 	/* We need to switch off panel power _and_ force vdd, for otherwise some
 	 * panels get very unhappy and cease to work. */
-	pp &= ~(POWER_TARGET_ON | PANEL_POWER_RESET | EDP_BLC_ENABLE);
+	pp &= ~(POWER_TARGET_ON | EDP_FORCE_VDD | PANEL_POWER_RESET | EDP_BLC_ENABLE);
 
 	pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
 
-- 
1.8.3.2