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

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Message-Id: <21676100-4D83-44F6-BB39-4FDFBDEAF462@canonical.com>
Date:   Tue, 4 Aug 2020 19:42:03 +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 17:48, Takashi Iwai <tiwai@...e.de> wrote:
> 
> On Tue, 04 Aug 2020 11:31:59 +0200,
> Kai-Heng Feng wrote:
>> 
>> 
>> 
>>> 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.
> 
> Well, what I meant was about which codec.  And now I see it in the
> below.
> 
>>> 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?
> 
> So it's a Kabylake, and I presume that it's rather an old machine.
> Is this for docking station or anything else?

The system is Comet Lake CPU so it's fairly recent. I think most Comet Lake platforms still use "Kabylake HDMI".

> 
> Basically the pin capability is rather fixed by the chip design while
> the pin configuration is set by BIOS.  And we follow the BIOS setup
> for determining which pins are actually alive.  That said, the bug is
> a BIOS bug.

Yes but sometimes vendors are reluctant to fix it because "Windows doesn't have this issue".

> 
> Note that PCI SSID bound with this codec might have a different
> number, so we might be still able to use the standard quirk table to
> pick up.

Ok. Will send v2 with a quirk list.

Kai-Heng

> 
> 
> thanks,
> 
> Takashi
> 
>>> 
>>> 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