linux-kernel - Re: [v2] ALSA: hda: Fix Nvidia dp infoframe

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Date:   Tue, 13 Sep 2022 09:15:28 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Mohan Kumar <mkumard@...dia.com>
Cc:     <tiwai@...e.com>, <perex@...ex.cz>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <linux-tegra@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [v2] ALSA: hda: Fix Nvidia dp infoframe

On Tue, 13 Sep 2022 08:58:18 +0200,
Mohan Kumar wrote:
> 
> Nvidia HDA HW expects infoframe data bytes order same for both
> HDMI and DP i.e infoframe data starts from 5th bytes offset. As
> dp infoframe structure has 4th byte as valid infoframe data, use
> hdmi infoframe structure for nvidia dp infoframe to match HW behvaior.
> 
> Signed-off-by: Mohan Kumar <mkumard@...dia.com>

Aha, so this affects on all Nvidia devices, not only on Tegra, but
also on PC?  Then we should put cc-to-stable definitely.

(No need to resend, I can put it locally.)


Takashi

> ---
>  sound/pci/hda/patch_hdmi.c | 23 +++++++++++++++++++----
>  1 file changed, 19 insertions(+), 4 deletions(-)
> 
> diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
> index 6c209cd26c0c..9127dd1b1a9c 100644
> --- a/sound/pci/hda/patch_hdmi.c
> +++ b/sound/pci/hda/patch_hdmi.c
> @@ -170,6 +170,8 @@ struct hdmi_spec {
>  	bool dyn_pcm_no_legacy;
>  	/* hdmi interrupt trigger control flag for Nvidia codec */
>  	bool hdmi_intr_trig_ctrl;
> +	bool nv_dp_workaround; /* workaround DP audio infoframe for Nvidia */
> +
>  	bool intel_hsw_fixup;	/* apply Intel platform-specific fixups */
>  	/*
>  	 * Non-generic VIA/NVIDIA specific
> @@ -679,15 +681,24 @@ static void hdmi_pin_setup_infoframe(struct hda_codec *codec,
>  				     int ca, int active_channels,
>  				     int conn_type)
>  {
> +	struct hdmi_spec *spec = codec->spec;
>  	union audio_infoframe ai;
>  
>  	memset(&ai, 0, sizeof(ai));
> -	if (conn_type == 0) { /* HDMI */
> +	if ((conn_type == 0) || /* HDMI */
> +		/* Nvidia DisplayPort: Nvidia HW expects same layout as HDMI */
> +		(conn_type == 1 && spec->nv_dp_workaround)) {
>  		struct hdmi_audio_infoframe *hdmi_ai = &ai.hdmi;
>  
> -		hdmi_ai->type		= 0x84;
> -		hdmi_ai->ver		= 0x01;
> -		hdmi_ai->len		= 0x0a;
> +		if (conn_type == 0) { /* HDMI */
> +			hdmi_ai->type		= 0x84;
> +			hdmi_ai->ver		= 0x01;
> +			hdmi_ai->len		= 0x0a;
> +		} else {/* Nvidia DP */
> +			hdmi_ai->type		= 0x84;
> +			hdmi_ai->ver		= 0x1b;
> +			hdmi_ai->len		= 0x11 << 2;
> +		}
>  		hdmi_ai->CC02_CT47	= active_channels - 1;
>  		hdmi_ai->CA		= ca;
>  		hdmi_checksum_audio_infoframe(hdmi_ai);
> @@ -3617,6 +3628,7 @@ static int patch_nvhdmi_2ch(struct hda_codec *codec)
>  	spec->pcm_playback.rates = SUPPORTED_RATES;
>  	spec->pcm_playback.maxbps = SUPPORTED_MAXBPS;
>  	spec->pcm_playback.formats = SUPPORTED_FORMATS;
> +	spec->nv_dp_workaround = true;
>  	return 0;
>  }
>  
> @@ -3756,6 +3768,7 @@ static int patch_nvhdmi(struct hda_codec *codec)
>  	spec->chmap.ops.chmap_cea_alloc_validate_get_type =
>  		nvhdmi_chmap_cea_alloc_validate_get_type;
>  	spec->chmap.ops.chmap_validate = nvhdmi_chmap_validate;
> +	spec->nv_dp_workaround = true;
>  
>  	codec->link_down_at_suspend = 1;
>  
> @@ -3779,6 +3792,7 @@ static int patch_nvhdmi_legacy(struct hda_codec *codec)
>  	spec->chmap.ops.chmap_cea_alloc_validate_get_type =
>  		nvhdmi_chmap_cea_alloc_validate_get_type;
>  	spec->chmap.ops.chmap_validate = nvhdmi_chmap_validate;
> +	spec->nv_dp_workaround = true;
>  
>  	codec->link_down_at_suspend = 1;
>  
> @@ -3992,6 +4006,7 @@ static int tegra_hdmi_init(struct hda_codec *codec)
>  	spec->chmap.ops.chmap_cea_alloc_validate_get_type =
>  		nvhdmi_chmap_cea_alloc_validate_get_type;
>  	spec->chmap.ops.chmap_validate = nvhdmi_chmap_validate;
> +	spec->nv_dp_workaround = true;
>  
>  	return 0;
>  }
> -- 
> 2.17.1
>