[Intel-gfx] [PATCH V2 1/1] drm/i915/audio: apply SKL codec wake up patch to BXT

[han.lu at intel.com]

From: "Lu, Han" <han.lu at intel.com>

For SKL we added a commit 632f3ab95fe2 ("drm/i915/audio: add codec wakeup
override enabled/disable callback"), in order to enable codec wakeup
override signal, to allow re-enumeration of the controller on SKL after
resume from low power state.
In SKL, HDMI/DP codec and PCH HD Audio Controller are in different power
wells, so it's necessary to reset display audio codecs when power well on,
otherwise display audio codecs will disappear when resume from low power
state.
Reset steps when power on:
    enable codec wakeup -> azx_init_chip() -> disable codec wakeup
Since the power well design did not change from SKL to BXT, we need to
apply the workaround to BXT also.

v2: add explanation

Signed-off-by: Lu, Han <han.lu at intel.com>

diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
index 63d4706..8310bf3 100644
--- a/drivers/gpu/drm/i915/intel_audio.c
+++ b/drivers/gpu/drm/i915/intel_audio.c
@@ -591,7 +591,8 @@ static void i915_audio_component_codec_wake_override(struct device *dev,
 	struct drm_i915_private *dev_priv = dev_to_i915(dev);
 	u32 tmp;
 
-	if (!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv))
+	if (!IS_SKYLAKE(dev_priv) && !IS_BROXTON(dev_priv) &&
+			!IS_KABYLAKE(dev_priv))
 		return;
 
 	/*
-- 
2.5.0