[Intel-gfx] [PATCH] drm/i915: Set hot plug interrupt detect enale for HDMI output

[Ma Ling]

We detect HDMI output connection status by writing to HOT Plug Interrupt
Detect Enable bit in PORT_HOTPLUG_EN.The behavior will generate an specified
interrupt, which is caught by audio driver, but during one detection driver
set all Detect Enable bits of HDMIB, HDMIC HDMID, and generate wrong
interrupt signals for current output, according to the signals audio driver
misunderstand device status. The patch intends to handle corresponding output precisely

It fixed bug #21371


Signed-off-by: Ma Ling <ling.ma at intel.com>
---
 drivers/gpu/drm/i915/intel_hdmi.c |   17 ++++++++++++-----
 1 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 5503742..d0983bb 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -155,11 +155,18 @@ intel_hdmi_detect(struct drm_connector *connector)
 
 	temp = I915_READ(PORT_HOTPLUG_EN);
 
-	I915_WRITE(PORT_HOTPLUG_EN,
-		   temp |
-		   HDMIB_HOTPLUG_INT_EN |
-		   HDMIC_HOTPLUG_INT_EN |
-		   HDMID_HOTPLUG_INT_EN);
+	switch (hdmi_priv->sdvox_reg) {
+	case SDVOB:
+		temp |= HDMIB_HOTPLUG_INT_EN;
+		break;
+	case SDVOC:
+		temp |= HDMIC_HOTPLUG_INT_EN;
+		break;
+	default:
+		return connector_status_unknown;
+	}
+
+	I915_WRITE(PORT_HOTPLUG_EN, temp);
 
 	POSTING_READ(PORT_HOTPLUG_EN);
 
-- 
1.5.4.4