[alsa-devel] New snd-hda warning spew

[Ville Syrjälä]

On Fri, Mar 18, 2016 at 03:22:15PM +0100, Takashi Iwai wrote:
> On Fri, 18 Mar 2016 14:54:59 +0100,
> Ville Syrjälä wrote:
> > 
> > On Wed, Mar 16, 2016 at 04:04:20PM +0200, Ville Syrjälä wrote:
> > > On Tue, Mar 15, 2016 at 06:22:56PM +0100, Takashi Iwai wrote:
> > > > On Tue, 15 Mar 2016 17:02:07 +0100,
> > > > Ville Syrjälä wrote:
> > > > > 
> > > > > We have a few new WARN spews from snd-hda causing some grief in i915 CI.
> > > > > 
> > > > > This one happens on ILK and BYT. Looks like it happens 100% of the time on driver load:
> > > > > [   18.809850] ------------[ cut here ]------------
> > > > > [   18.809866] WARNING: CPU: 0 PID: 39 at sound/hda/hdac_i915.c:129 pin2port+0x25/0x30 [snd_hda_core]()
> > > > 
> > > > This is bad.  Basically we had a naive assumption of the fixed mapping
> > > > between the port number and the HD-audio widget, but it doesn't apply
> > > > properly to pre-HSW models.
> > > > 
> > > > The patch attached below disables the audio binding for pre-HSW
> > > > models.  I'm going to queue to for-linus branch.
> > > 
> > > That seems to eliminate the warn on my ILK.
> > 
> > Apparently it was less effective on BYT. We still get this:
> 
> Ouch, I forgot that Baytrail had already i915 component binding in the
> controller side.  I assumed too naively that all old models have no
> binding.
> 
> Below is the additional fix patch.

Still getting blasted at least via snd_hdac_sync_audio_rate()

> 
> Thanks for reporting!
> 
> 
> Takashi
> 
> -- 8< --
> From: Takashi Iwai <tiwai at suse.de>
> Subject: [PATCH] ALSA: hda - Really restrict i915 notifier to HSW+
> 
> The commit [b62232d429fa: ALSA: hda - Limit i915 HDMI binding only for
> HSW and later] tried to limit the usage of i915 audio notifier to the
> recent Intel models and switch to the old method on pre-Haswell
> models.  However, it assumed that the i915 component binding hasn't
> been done on such models, and the assumption was wrong: namely,
> Baytrail had already the i915 component binding due to powerwell
> control.  Thus, the workaround wasn't applied to Baytrail.
> 
> For fixing this properly, this patch introduces a new flag indicating
> the usage of audio notifier and codec_has_acomp() refers to this flag
> instead of checking the existence of audio component.
> 
> Reported-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Cc: <stable at vger.kernel.org> # v4.5
> Signed-off-by: Takashi Iwai <tiwai at suse.de>
> ---
>  sound/pci/hda/patch_hdmi.c | 24 +++++++++++++++++-------
>  1 file changed, 17 insertions(+), 7 deletions(-)
> 
> diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
> index 49ee4e55dd16..8cdb804aa9cf 100644
> --- a/sound/pci/hda/patch_hdmi.c
> +++ b/sound/pci/hda/patch_hdmi.c
> @@ -152,6 +152,7 @@ struct hdmi_spec {
>  	struct hda_pcm_stream pcm_playback;
>  
>  	/* i915/powerwell (Haswell+/Valleyview+) specific */
> +	bool use_acomp_notifier; /* use i915 eld_notify callback for hotplug */
>  	struct i915_audio_component_audio_ops i915_audio_ops;
>  	bool i915_bound; /* was i915 bound in this driver? */
>  
> @@ -159,8 +160,11 @@ struct hdmi_spec {
>  };
>  
>  #ifdef CONFIG_SND_HDA_I915
> -#define codec_has_acomp(codec) \
> -	((codec)->bus->core.audio_component != NULL)
> +static inline bool codec_has_acomp(struct hda_codec *codec)
> +{
> +	struct hdmi_spec *spec = codec->spec;
> +	return spec->use_acomp_notifier;
> +}
>  #else
>  #define codec_has_acomp(codec)	false
>  #endif
> @@ -2248,12 +2252,18 @@ static int patch_generic_hdmi(struct hda_codec *codec)
>  	codec->spec = spec;
>  	hdmi_array_init(spec, 4);
>  
> +#ifdef CONFIG_SND_HDA_I915
>  	/* Try to bind with i915 for Intel HSW+ codecs (if not done yet) */
> -	if (!codec_has_acomp(codec) &&
> -	    (codec->core.vendor_id >> 16) == 0x8086 &&
> -	    is_haswell_plus(codec))
> -		if (!snd_hdac_i915_init(&codec->bus->core))
> -			spec->i915_bound = true;
> +	if ((codec->core.vendor_id >> 16) == 0x8086 &&
> +	    is_haswell_plus(codec)) {
> +		if (!codec->bus->core.audio_component)
> +			if (!snd_hdac_i915_init(&codec->bus->core))
> +				spec->i915_bound = true;
> +		/* use i915 audio component notifier for hotplug */
> +		if (codec->bus->core.audio_component)
> +			spec->use_acomp_notifier = true;
> +	}
> +#endif
>  
>  	if (is_haswell_plus(codec)) {
>  		intel_haswell_enable_all_pins(codec, true);
> -- 
> 2.7.4

-- 
Ville Syrjälä
Intel OTC