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From 74f829a6e44fe217b6161f8935524fc807be0648 Mon Sep 17 00:00:00 2001
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From: Chris Wilson <chris@chris-wilson.co.uk>
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Date: Sat, 9 Jul 2016 11:01:20 +0100
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Subject: [PATCH] drm/i915: Acquire audio powerwell for HD-Audio registers
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On Haswell/Broadwell, the HD-Audio block is inside the HDMI/display
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power well and so the sna-hda audio codec acquires the display power
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well while it is operational. However, Skylake separates the powerwells
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again, but yet we still need the audio powerwell to setup the registers.
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(But then the hardware uses those registers even while powered off???)
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v2: Grab both rpm wakelock and audio wakelock
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Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96214
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Fixes: 03b135cebc47 "ALSA: hda - remove dependency on i915 power well for SKL")
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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Cc: Libin Yang <libin.yang@intel.com>
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Cc: Takashi Iwai <tiwai@suse.de>
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Cc: Marius Vlad <marius.c.vlad@intel.com>
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---
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drivers/gpu/drm/i915/intel_audio.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
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index 5d5f6bc10e85..948a7a52e3f8 100644
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--- a/drivers/gpu/drm/i915/intel_audio.c
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+++ b/drivers/gpu/drm/i915/intel_audio.c
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@@ -600,6 +600,8 @@ static void i915_audio_component_codec_wake_override(struct device *dev,
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if (!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv))
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return;
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+ i915_audio_component_get_power(dev);
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+
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/*
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* Enable/disable generating the codec wake signal, overriding the
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* internal logic to generate the codec wake to controller.
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@@ -615,6 +617,8 @@ static void i915_audio_component_codec_wake_override(struct device *dev,
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I915_WRITE(HSW_AUD_CHICKENBIT, tmp);
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usleep_range(1000, 1500);
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}
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+
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+ i915_audio_component_put_power(dev);
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}
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/* Get CDCLK in kHz */
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@@ -648,6 +652,7 @@ static int i915_audio_component_sync_audio_rate(struct device *dev,
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!IS_HASWELL(dev_priv))
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return 0;
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+ i915_audio_component_get_power(dev);
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mutex_lock(&dev_priv->av_mutex);
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/* 1. get the pipe */
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intel_encoder = dev_priv->dig_port_map[port];
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@@ -698,6 +703,7 @@ static int i915_audio_component_sync_audio_rate(struct device *dev,
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unlock:
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mutex_unlock(&dev_priv->av_mutex);
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+ i915_audio_component_put_power(dev);
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return err;
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}
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--
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2.8.1
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