[Intel-gfx] [PATCH 2/7] drm/i915: DisplayPort hot remove notification to audio driver

[Eugeni Dodonov]

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

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

Note that the DP_AUDIO_OUTPUT_ENABLE bit may be enabled or disabled
only when the link training is complete and set to "Normal".

Tested OK for both hot plug/remove and DPMS on/off.

Upstream patch:
commit 832afda6a7d7235ef0e09f4ec46736861540da6d
Author: Wu Fengguang <fengguang.wu at intel.com>
Date:   Fri Dec 9 20:42:21 2011 +0800

    drm/i915: DisplayPort hot remove notification to audio driver

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_dp.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 92b041b..db3b461 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1926,6 +1926,7 @@ intel_dp_link_down(struct intel_dp *intel_dp)
 			intel_wait_for_vblank(dev, to_intel_crtc(crtc)->pipe);
 	}
 
+	DP &= ~DP_AUDIO_OUTPUT_ENABLE;
 	I915_WRITE(intel_dp->output_reg, DP & ~DP_PORT_EN);
 	POSTING_READ(intel_dp->output_reg);
 	msleep(intel_dp->panel_power_down_delay);
-- 
1.7.8.4