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From:   Mohan Kumar <mkumard@nvidia.com>
To:     <tiwai@suse.com>, <perex@perex.cz>, <thierry.reding@gmail.com>
CC:     <jonathanh@nvidia.com>, <linux-tegra@vger.kernel.org>,
        <alsa-devel@alsa-project.org>, <linux-kernel@vger.kernel.org>,
        Mohan Kumar <mkumard@nvidia.com>
Subject: [v2] ALSA: hda: Fix Nvidia dp infoframe
Date:   Tue, 13 Sep 2022 12:28:18 +0530
Message-ID: <20220913065818.13015-1-mkumard@nvidia.com>
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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@nvidia.com>
---
 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