[Intel-gfx] [PATCH] drm/i915: Fix HDMI mode select for Cougarpoint PCH

[Zhenyu Wang]

For real HDMI sink, CPT HDMI port has to set 'HDMI' mode flag
in order to make HDMI audio work correctly.

This is required patch for drm/i915 to enable HDMI audio on CPT PCH,
ALSA patch is at http://mailman.alsa-project.org/pipermail/alsa-devel/2010-May/027601.html

Tested-by: Fengguang Wu <fengguang.wu at intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h   |    3 +++
 drivers/gpu/drm/i915/intel_hdmi.c |    5 ++++-
 2 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index f3e39cc..fb8ffbe 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2690,6 +2690,9 @@
 #define  SDVO_ENCODING          (0)
 #define  TMDS_ENCODING          (2 << 10)
 #define  NULL_PACKET_VSYNC_ENABLE       (1 << 9)
+/* CPT */
+#define  HDMI_MODE_SELECT	(1 << 9)
+#define  DVI_MODE_SELECT	(0)
 #define  SDVOB_BORDER_ENABLE    (1 << 7)
 #define  AUDIO_ENABLE           (1 << 6)
 #define  VSYNC_ACTIVE_HIGH      (1 << 4)
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 8a1c4ed..acaca07 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -59,8 +59,11 @@ static void intel_hdmi_mode_set(struct drm_encoder *encoder,
 		SDVO_VSYNC_ACTIVE_HIGH |
 		SDVO_HSYNC_ACTIVE_HIGH;
 
-	if (hdmi_priv->has_hdmi_sink)
+	if (hdmi_priv->has_hdmi_sink) {
 		sdvox |= SDVO_AUDIO_ENABLE;
+		if (HAS_PCH_CPT(dev))
+			sdvox |= HDMI_MODE_SELECT;
+	}
 
 	if (intel_crtc->pipe == 1) {
 		if (HAS_PCH_CPT(dev))
-- 
1.7.0.4