[Intel-gfx] [PATCH] Set hot plug interrupt to detect HDMI output

[ling.ma at intel.com]

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 and HDMID, which 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 fredesktop bug #21371

Signed-off-by: Ma Ling <ling.ma at intel.com>
---
 src/i830_hdmi.c |   18 +++++++++++++-----
 1 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/src/i830_hdmi.c b/src/i830_hdmi.c
index 0abb151..63fc6dc 100644
--- a/src/i830_hdmi.c
+++ b/src/i830_hdmi.c
@@ -166,14 +166,22 @@ i830_hdmi_detect(xf86OutputPtr output)
 
     temp = INREG(PORT_HOTPLUG_EN);
 
-    OUTREG(PORT_HOTPLUG_EN,
-	   temp |
-	   HDMIB_HOTPLUG_INT_EN |
-	   HDMIC_HOTPLUG_INT_EN |
-	   HDMID_HOTPLUG_INT_EN);
+    switch (dev_priv->output_reg) {
+    case SDVOB:
+	temp |= HDMIB_HOTPLUG_INT_EN;
+	break;
+    case SDVOC:
+	temp |= HDMIC_HOTPLUG_INT_EN;
+	break;
+    default:
+	return XF86OutputStatusUnknown;
+    }
+
+    OUTREG(PORT_HOTPLUG_EN, temp);
 
     POSTING_READ(PORT_HOTPLUG_EN);
 
+    i830WaitForVblank(pScrn);
     switch (dev_priv->output_reg) {
     case SDVOB:
 	bit = HDMIB_HOTPLUG_INT_STATUS;
-- 
1.5.4.4