[Intel-gfx] [PATCH] drm/i915: disable ADPA before dpms operation

[ling.ma at intel.com]

Before dmps operation we don't know current ADPA status,
so need to disable enable bit in advance, then handle
dpms according to instruction from drm.

Signed-off-by: Ma Ling <ling.ma at intel.com>
---
 drivers/gpu/drm/i915/intel_crt.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index 6de97fc..e344130 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -46,7 +46,7 @@ static void intel_crt_dpms(struct drm_encoder *encoder, int mode)
 
 	temp = I915_READ(reg);
 	temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
-	temp |= ADPA_DAC_ENABLE;
+	temp &= ~ADPA_DAC_ENABLE;
 
 	switch(mode) {
 	case DRM_MODE_DPMS_ON:
-- 
1.5.4.4