Re: Support MCP89 hdmi audio

[Takashi Iwai <tiwai@suse.de>]

Wei,

At Fri, 23 Jul 2010 16:43:57 +0800,
Wei Ni wrote:
> 
> Hi, Takashi
> I tried your patch file, it worked fine on MCP89 board.
> But I still need to check some other problems.
> So please don't add this patch now.

What is the status now?


thanks,

Takashi

> 
> Thanks
> Wei.
> 
> -----Original Message-----
> From: Wei Ni 
> Sent: Thursday, July 22, 2010 11:14 AM
> To: 'Takashi Iwai'
> Cc: Wu Fengguang; 'Pavel Hofman'; 'alsa-devel'; 'linux-kernel'; 'akpm'
> Subject: RE: Support MCP89 hdmi audio
> 
> it's great, I will try it.
> 
> Thanks
> Wei.
> 
> -----Original Message-----
> From: Takashi Iwai [mailto:tiwai@suse.de] 
> Sent: Wednesday, July 21, 2010 8:53 PM
> To: Wei Ni
> Cc: Wu Fengguang; 'Pavel Hofman'; 'alsa-devel'; 'linux-kernel'; 'akpm'
> Subject: Re: Support MCP89 hdmi audio
> 
> At Wed, 21 Jul 2010 19:45:09 +0800,
> Wei Ni wrote:
> > 
> > Hi, all
> > I'm an Nvidia engineer, I maintain the nvidia linux hdmi audio driver.
> > 
> > An end-user report a problem with his TV attached to an MCP89.
> > ALSA won't send audio to it, because
> > PD=0:
> > HDMI hot plug event: Pin=5 Presence_Detect=1 ELD_Valid=0
> > HDMI hot plug event: Pin=5 Presence_Detect=0 ELD_Valid=1
> > 
> > As you know, in linux driver patch_hdmi.c, it use (pind && eldv)
> > in unsolicited events. So the driver can't detect the monitor.
> > 
> > >From the HAD specification
> > (http://download.intel.com/standards/hdaudio/pdf/HDA036.pdf):
> > 
> > Original text for Unsolicited Response PD bit:
> > 
> > Presence Detect: When this bit is set, sense measurement has
> > changed on the pin widget and software can use the pin sense
> > control verb to determine the current pin sense data state.
> > For analog pin widgets, this UR means that Presence Detect or
> > Impedance has changed on the pin widget.
> > For digital pin widgets, including HDMI pin widgets, this means
> > that presence detect (and optionally ELD valid bit) has
> > **changed**. [my emphasis]
> > 
> > Updated text for Unsolicted Response PD bit:
> > 
> > Presence Detect: This bit reflects the **present** [my
> > emphasis] state of the Pin Sense Presence Detect bit when the
> > unsolicited response is triggered. Software can optionally use
> > the pin sense control verb to determine the latest pin sense
> > data state. This bit implementation is only required for
> > digital display pin widget. Non digital display pin widget is
> > optional to implement this bit.
> > 
> > For our MCP89, the values indicates the change of status of PD, not the actual value of PD,
> > which follows older description of UR for PD bit.
> > 
> > So could we add a workaround for MCP89? We could use Pin Sense to determine again in
> > unsolicited events. If it return 0xc0000000, it means PD=1 and ELVD=1.
> > Or do you have any suggestions?
> 
> Yes.  The patch below does similar thing.
> Could you give it a try?
> 
> 
> thanks,
> 
> Takashi
> 
> ---
> diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
> index 86067ee..2fc5396 100644
> --- a/sound/pci/hda/patch_hdmi.c
> +++ b/sound/pci/hda/patch_hdmi.c
> @@ -52,6 +52,10 @@ struct hdmi_spec {
>  	 */
>  	struct hda_multi_out multiout;
>  	unsigned int codec_type;
> +
> +	/* misc flags */
> +	/* PD bit indicates only the update, not the current state */
> +	unsigned int old_pin_detect:1;
>  };
>  
>  
> @@ -616,6 +620,9 @@ static void hdmi_setup_audio_infoframe(struct hda_codec *codec, hda_nid_t nid,
>   * Unsolicited events
>   */
>  
> +static void hdmi_present_sense(struct hda_codec *codec, hda_nid_t pin_nid,
> +			       struct hdmi_eld *eld);
> +
>  static void hdmi_intrinsic_event(struct hda_codec *codec, unsigned int res)
>  {
>  	struct hdmi_spec *spec = codec->spec;
> @@ -632,6 +639,12 @@ static void hdmi_intrinsic_event(struct hda_codec *codec, unsigned int res)
>  	if (index < 0)
>  		return;
>  
> +	if (spec->old_pin_detect) {
> +		if (pind)
> +			hdmi_present_sense(codec, tag, &spec->sink_eld[index]);
> +		pind = spec->sink_eld[index].monitor_present;
> +	}
> +
>  	spec->sink_eld[index].monitor_present = pind;
>  	spec->sink_eld[index].eld_valid = eldv;
>  
> diff --git a/sound/pci/hda/patch_nvhdmi.c b/sound/pci/hda/patch_nvhdmi.c
> index 3c10c0b..b0652ac 100644
> --- a/sound/pci/hda/patch_nvhdmi.c
> +++ b/sound/pci/hda/patch_nvhdmi.c
> @@ -478,6 +478,7 @@ static int patch_nvhdmi_8ch_89(struct hda_codec *codec)
>  
>  	codec->spec = spec;
>  	spec->codec_type = HDA_CODEC_NVIDIA_MCP89;
> +	spec->old_pin_detect = 1;
>  
>  	if (hdmi_parse_codec(codec) < 0) {
>  		codec->spec = NULL;
> @@ -508,6 +509,7 @@ static int patch_nvhdmi_8ch_7x(struct hda_codec *codec)
>  	spec->multiout.max_channels = 8;
>  	spec->multiout.dig_out_nid = nvhdmi_master_con_nid_7x;
>  	spec->codec_type = HDA_CODEC_NVIDIA_MCP7X;
> +	spec->old_pin_detect = 1;
>  
>  	codec->patch_ops = nvhdmi_patch_ops_8ch_7x;
>  
> @@ -528,6 +530,7 @@ static int patch_nvhdmi_2ch(struct hda_codec *codec)
>  	spec->multiout.max_channels = 2;
>  	spec->multiout.dig_out_nid = nvhdmi_master_con_nid_7x;
>  	spec->codec_type = HDA_CODEC_NVIDIA_MCP7X;
> +	spec->old_pin_detect = 1;
>  
>  	codec->patch_ops = nvhdmi_patch_ops_2ch;
>  
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