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
