linux-kernel - Re: [PATCH] ALSA: hda/hdmi: Add pins with jack detection support

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Date:   Tue, 4 Aug 2020 17:31:59 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     tiwai@...e.com, Jaroslav Kysela <perex@...ex.cz>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Nikhil Mahale <nmahale@...dia.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Aaron Plattner <aplattner@...dia.com>,
        "moderated list:SOUND" <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ALSA: hda/hdmi: Add pins with jack detection support



> On Aug 4, 2020, at 17:04, Takashi Iwai <tiwai@...e.de> wrote:
> 
> On Tue, 04 Aug 2020 09:29:25 +0200,
> Kai-Heng Feng wrote:
>> 
>> HDMI on some platforms doesn't enable audio support because its Port
>> Connectivity [31:30] is set to AC_JACK_PORT_NONE:
>> Node 0x05 [Pin Complex] wcaps 0x40778d: 8-Channels Digital Amp-Out CP
>>  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
>>  Amp-Out vals:  [0x00 0x00]
>>  Pincap 0x0b000094: OUT Detect HBR HDMI DP
>>  Pin Default 0x58560010: [N/A] Digital Out at Int HDMI
>>    Conn = Digital, Color = Unknown
>>    DefAssociation = 0x1, Sequence = 0x0
>>  Pin-ctls: 0x40: OUT
>>  Unsolicited: tag=00, enabled=0
>>  Power states:  D0 D3 EPSS
>>  Power: setting=D0, actual=D0
>>  Devices: 0
>>  Connection: 3
>>     0x02 0x03* 0x04
>> 
>> Those pins were filtered out by commit 116dcde63806 ("ALSA: HDA: Remove
>> unconnected PCM devices for Intel HDMI"). However, jacks that support
>> detection won't have the issues the commit addresses.
>> 
>> So still add the pin if it supports jack detection.
>> 
>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> 
> Which platform did show the problem?

An HP desktop.

> 
> I'm reluctant to apply this change as it would potentially break the
> existing system.  If we must to apply, maybe it's safer to apply it
> conditionally to the limited devices.

Hmm, I find it's a bit hard to match a specific device, because the ID seems to be rather generic:
Codec: Intel Kabylake HDMI
Address: 2                      
AFG Function Id: 0x1 (unsol 0)
Vendor Id: 0x8086280b         
Subsystem Id: 0x80860101
Revision Id: 0x100000

Should we use DMI string instead?

Kai-Heng

> 
> 
> thanks,
> 
> Takashi
> 
>> ---
>> sound/pci/hda/patch_hdmi.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>> 
>> diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
>> index cd46247988e4..db3a5148bd40 100644
>> --- a/sound/pci/hda/patch_hdmi.c
>> +++ b/sound/pci/hda/patch_hdmi.c
>> @@ -1701,7 +1701,8 @@ static int hdmi_add_pin(struct hda_codec *codec, hda_nid_t pin_nid)
>> 	 * all device entries on the same pin
>> 	 */
>> 	config = snd_hda_codec_get_pincfg(codec, pin_nid);
>> -	if (get_defcfg_connect(config) == AC_JACK_PORT_NONE)
>> +	if ((get_defcfg_connect(config) == AC_JACK_PORT_NONE) &&
>> +	    !(caps & AC_PINCAP_PRES_DETECT))
>> 		return 0;
>> 
>> 	/*
>> -- 
>> 2.17.1