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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [BDW][Audio][HD-A Display] DP/HDMI audio playback abnormal"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91410#c29">Comment # 29</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [BDW][Audio][HD-A Display] DP/HDMI audio playback abnormal"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91410">bug 91410</a>
from <span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span></b>
<pre>(In reply to Jani Nikula from <a href="show_bug.cgi?id=91410#c26">comment #26</a>)
<span class="quote">> We have the function to query cdclk frequency because the audio registers
> em4/5 are lost if the display power domains go to power save. If my memory
> serves me right the function to query cdclk frequency predates the ability
> to change cdclk frequency. It's likely the audio driver only queries cdclk
> whenever the em4/5 registers may have been lost, and we don't communicate
> cdclk changes.
>
> Sadly, there's no dmesg with drm.debug=14 to see if there actually are any
> cdclk changes in the cases in question, or if that's just another
> theoretical case I came up in addition!
>
> I guess we should also do
>
> diff --git a/drivers/gpu/drm/i915/intel_audio.c
> b/drivers/gpu/drm/i915/intel_audio.c
> index 56ba8765816e..1063108a9bab 100644
> --- a/drivers/gpu/drm/i915/intel_audio.c
> +++ b/drivers/gpu/drm/i915/intel_audio.c
> @@ -624,17 +624,11 @@ static void
> i915_audio_component_codec_wake_override(struct device *dev,
> static int i915_audio_component_get_cdclk_freq(struct device *dev)
> {
> struct drm_i915_private *dev_priv = dev_to_i915(dev);
> - int ret;
>
> if (WARN_ON_ONCE(!HAS_DDI(dev_priv)))
> return -ENODEV;
>
> - intel_display_power_get(dev_priv, POWER_DOMAIN_AUDIO);
> - ret = dev_priv->display.get_display_clock_speed(dev_priv->dev);
> -
> - intel_display_power_put(dev_priv, POWER_DOMAIN_AUDIO);
> -
> - return ret;
> + return dev_priv->cdclk_freq;
> }
>
> static int i915_audio_component_sync_audio_rate(struct device *dev,</span >
That is exactly my patch from <a href="show_bug.cgi?id=91410#c21">comment 21</a> ;)</pre>
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