[PATCH] drm/i915: HDMI/DP - ELD info refresh support for Haswell

[Wang Xingchao <xingchao.wang@intel.com>]

ELD info should be updated dynamically according to hot plug event.
For haswell chip, clear/set the eld valid bit and output enable bit
from callback intel_disable/eanble_ddi().

Signed-off-by: Wang Xingchao <xingchao.wang@intel.com>
---
 drivers/gpu/drm/i915/intel_ddi.c |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index f02b3fe..a80125f 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1274,10 +1274,15 @@ static void intel_ddi_post_disable(struct intel_encoder *intel_encoder)
 static void intel_enable_ddi(struct intel_encoder *intel_encoder)
 {
 	struct drm_encoder *encoder = &intel_encoder->base;
+	struct drm_crtc *crtc = encoder->crtc;
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+	int pipe = intel_crtc->pipe;
 	struct drm_device *dev = encoder->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	enum port port = intel_ddi_get_encoder_port(intel_encoder);
 	int type = intel_encoder->type;
+	int aud_cntrl_st2 = HSW_AUD_PIN_ELD_CP_VLD;
+	int tmp;
 
 	if (type == INTEL_OUTPUT_HDMI) {
 		/* In HDMI/DVI mode, the port width, and swing/emphasis values
@@ -1290,18 +1295,33 @@ static void intel_enable_ddi(struct intel_encoder *intel_encoder)
 
 		ironlake_edp_backlight_on(intel_dp);
 	}
+
+	tmp = I915_READ(aud_cntrl_st2);
+	tmp |= ((AUDIO_OUTPUT_ENABLE_A | AUDIO_ELD_VALID_A) << (pipe * 4));
+	I915_WRITE(aud_cntrl_st2, tmp);
 }
 
 static void intel_disable_ddi(struct intel_encoder *intel_encoder)
 {
 	struct drm_encoder *encoder = &intel_encoder->base;
+	struct drm_crtc *crtc = encoder->crtc;
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+	int pipe = intel_crtc->pipe;
 	int type = intel_encoder->type;
+	int aud_cntrl_st2 = HSW_AUD_PIN_ELD_CP_VLD;
+	struct drm_device *dev = encoder->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	int tmp;
 
 	if (type == INTEL_OUTPUT_EDP) {
 		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
 
 		ironlake_edp_backlight_off(intel_dp);
 	}
+
+	tmp = I915_READ(aud_cntrl_st2);
+	tmp &= ~((AUDIO_OUTPUT_ENABLE_A | AUDIO_ELD_VALID_A) << (pipe * 4));
+	I915_WRITE(aud_cntrl_st2, tmp);
 }
 
 int intel_ddi_get_cdclk_freq(struct drm_i915_private *dev_priv)
-- 
1.7.9.5