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@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@xxxxxxxxx>
---
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
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