[Intel-gfx] [PATCH 1/7] drm/i915: HDMI hot remove notification to audio driver

[Eugeni Dodonov]

From: Wu Fengguang <fengguang.wu at intel.com>

On HDMI monitor hot remove, clear SDVO_AUDIO_ENABLE accordingly, so that
the audio driver will receive hot plug events and take action to refresh
its device state and ELD contents.

The cleared SDVO_AUDIO_ENABLE bit needs to be restored to prevent losing
HDMI audio after DPMS on.

Upstream patch:
commit 2deed761188d7480eb5f7efbfe7aa77f09322ed8
Author: Wu Fengguang <fengguang.wu at intel.com>
Date:   Fri Dec 9 20:42:20 2011 +0800

    drm/i915: HDMI hot remove notification to audio driver

CC: Wang Zhenyu <zhenyu.z.wang at intel.com>
Signed-off-by: Wu Fengguang <fengguang.wu at intel.com>
Signed-off-by: Keith Packard <keithp at keithp.com>
Signed-off-by: Eugeni Dodonov <eugeni.dodonov at intel.com>
---
 drivers/gpu/drm/i915/intel_hdmi.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index d4f5a0b..64541f7 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -269,6 +269,10 @@ static void intel_hdmi_dpms(struct drm_encoder *encoder, int mode)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
 	u32 temp;
+	u32 enable_bits = SDVO_ENABLE;
+
+	if (intel_hdmi->has_audio)
+		enable_bits |= SDVO_AUDIO_ENABLE;
 
 	temp = I915_READ(intel_hdmi->sdvox_reg);
 
@@ -281,9 +285,9 @@ static void intel_hdmi_dpms(struct drm_encoder *encoder, int mode)
 	}
 
 	if (mode != DRM_MODE_DPMS_ON) {
-		temp &= ~SDVO_ENABLE;
+		temp &= ~enable_bits;
 	} else {
-		temp |= SDVO_ENABLE;
+		temp |= enable_bits;
 	}
 
 	I915_WRITE(intel_hdmi->sdvox_reg, temp);
-- 
1.7.8.4