linux-kernel - [PATCH] drm/i915: DisplayPort hot remove notification to audio driver

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Message-ID: <20111209090343.GA2320@localhost>
Date:	Fri, 9 Dec 2011 17:03:43 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Keith Packard <keithp@...thp.com>
Cc:	Takashi Iwai <tiwai@...e.de>,
	"Wang, Zhenyu Z" <zhenyu.z.wang@...el.com>,
	"intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] drm/i915: DisplayPort hot remove notification to audio
 driver

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".

Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
---
 drivers/gpu/drm/i915/intel_dp.c |    1 +
 1 file changed, 1 insertion(+)

This works both on KMS console and gnome desktop.
Hot plug/unplug and DPMS on/off are all tested OK.

--- linux.orig/drivers/gpu/drm/i915/intel_dp.c	2011-12-09 16:51:21.000000000 +0800
+++ linux/drivers/gpu/drm/i915/intel_dp.c	2011-12-09 16:59:45.000000000 +0800
@@ -1771,6 +1771,7 @@ intel_dp_link_down(struct intel_dp *inte
 			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);
--
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