[alsa-devel] [PATCH 4/4] ALSA: hda - Wake the codec up on pin/ELD notify events

[Takashi Iwai]

On Wed, 19 Aug 2015 10:48:58 +0200,
David Henningsson wrote:
> 
> Whenever there is an event from the i915 driver, wake the codec
> and recheck plug/unplug + ELD status.
> 
> This fixes the issue with lost unsol events in power save mode,
> the codec and controller can now sleep in D3 and still know when
> the HDMI monitor has been connected.
> 
> Signed-off-by: David Henningsson <david.henningsson at canonical.com>

This addition looks fine, but then we'll get double notification for
the normal hotplug/unplug, one via component ops and another via unsol
event?


thanks,

Takashi

> ---
>  sound/pci/hda/patch_hdmi.c | 22 +++++++++++++++++++++-
>  1 file changed, 21 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
> index a97db5f..932292c 100644
> --- a/sound/pci/hda/patch_hdmi.c
> +++ b/sound/pci/hda/patch_hdmi.c
> @@ -37,6 +37,8 @@
>  #include <sound/jack.h>
>  #include <sound/asoundef.h>
>  #include <sound/tlv.h>
> +#include <sound/hdaudio.h>
> +#include <sound/hda_i915.h>
>  #include "hda_codec.h"
>  #include "hda_local.h"
>  #include "hda_jack.h"
> @@ -144,6 +146,9 @@ struct hdmi_spec {
>  	 */
>  	struct hda_multi_out multiout;
>  	struct hda_pcm_stream pcm_playback;
> +
> +	/* i915/powerwell (Haswell+/Valleyview+) specific */
> +	struct i915_audio_component_audio_ops i915_audio_ops;
>  };
>  
>  
> @@ -2191,6 +2196,9 @@ static void generic_hdmi_free(struct hda_codec *codec)
>  	struct hdmi_spec *spec = codec->spec;
>  	int pin_idx;
>  
> +	if (is_haswell_plus(codec) || is_valleyview_plus(codec))
> +		snd_hdac_i915_register_notifier(NULL);
> +
>  	for (pin_idx = 0; pin_idx < spec->num_pins; pin_idx++) {
>  		struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
>  
> @@ -2316,6 +2324,14 @@ static void haswell_set_power_state(struct hda_codec *codec, hda_nid_t fg,
>  	snd_hda_codec_set_power_to_all(codec, fg, power_state);
>  }
>  
> +static void intel_pin_eld_notify(void *audio_ptr, int port, int port_mst_index)
> +{
> +	struct hda_codec *codec = audio_ptr;
> +	int pin_nid = port + 0x04;
> +
> +	check_presence_and_report(codec, pin_nid);
> +}
> +
>  static int patch_generic_hdmi(struct hda_codec *codec)
>  {
>  	struct hdmi_spec *spec;
> @@ -2342,8 +2358,12 @@ static int patch_generic_hdmi(struct hda_codec *codec)
>  	if (is_valleyview_plus(codec) || is_skylake(codec))
>  		codec->core.link_power_control = 1;
>  
> -	if (is_haswell_plus(codec) || is_valleyview_plus(codec))
> +	if (is_haswell_plus(codec) || is_valleyview_plus(codec)) {
>  		codec->depop_delay = 0;
> +		spec->i915_audio_ops.audio_ptr = codec;
> +		spec->i915_audio_ops.pin_eld_notify = intel_pin_eld_notify;
> +		snd_hdac_i915_register_notifier(&spec->i915_audio_ops);
> +	}
>  
>  	if (hdmi_parse_codec(codec) < 0) {
>  		codec->spec = NULL;
> -- 
> 1.9.1
>