linux-kernel - [patch 40/86] drm/i915: HDMI hot remove notification to audio driver

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Date:	Fri, 10 Feb 2012 14:29:59 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Wang Zhenyu <zhenyu.z.wang@...el.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Keith Packard <keithp@...thp.com>,
	Eugeni Dodonov <eugeni.dodonov@...el.com>
Subject: [patch 40/86] drm/i915: HDMI hot remove notification to audio driver

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Wu Fengguang <fengguang.wu@...el.com>

commit 2deed761188d7480eb5f7efbfe7aa77f09322ed8 upstream.

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.

CC: Wang Zhenyu <zhenyu.z.wang@...el.com>
Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
Signed-off-by: Keith Packard <keithp@...thp.com>
Signed-off-by: Eugeni Dodonov <eugeni.dodonov@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/intel_hdmi.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- 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_e
 	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_e
 	}
 
 	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);


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