linux-kernel - [PATCH 05/10] ASoC: tegra: Update PLL rate for Tegra264

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Message-ID: <20250422072805.501152-6-sheetal@nvidia.com>
Date: Tue, 22 Apr 2025 07:28:00 +0000
From: "Sheetal ." <sheetal@...dia.com>
To: <broonie@...nel.org>, <linux-sound@...r.kernel.org>
CC: <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<jonathanh@...dia.com>, <thierry.reding@...il.com>, <mkumard@...dia.com>,
	<spujar@...dia.com>, Sheetal <sheetal@...dia.com>
Subject: [PATCH 05/10] ASoC: tegra: Update PLL rate for Tegra264

From: Sheetal <sheetal@...dia.com>

The PLLs should be set with a VCO frequency in the 900MHz – 1GHz range
to minimize jitter and ppm error for Tegra264. Add the PLLA rate
accordingly.

Therefore, use 983040000 frequency is for multiple of 8K frequencies
and 993484800 frequency is for multiple of 11.025K frequencies.

Signed-off-by: Sheetal <sheetal@...dia.com>
---
 sound/soc/tegra/tegra_audio_graph_card.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/sound/soc/tegra/tegra_audio_graph_card.c b/sound/soc/tegra/tegra_audio_graph_card.c
index 8b48813c2c59..94b5ab77649b 100644
--- a/sound/soc/tegra/tegra_audio_graph_card.c
+++ b/sound/soc/tegra/tegra_audio_graph_card.c
@@ -1,8 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
+// SPDX-FileCopyrightText: Copyright (c) 2020-2025 NVIDIA CORPORATION. All rights reserved.
 //
 // tegra_audio_graph_card.c - Audio Graph based Tegra Machine Driver
-//
-// Copyright (c) 2020-2021 NVIDIA CORPORATION.  All rights reserved.
 
 #include <linux/math64.h>
 #include <linux/module.h>
@@ -232,11 +231,22 @@ static const struct tegra_audio_cdata tegra186_data = {
 	.plla_out0_rates[x11_RATE] = 45158400,
 };
 
+static const struct tegra_audio_cdata tegra264_data = {
+	/* PLLA1 */
+	.plla_rates[x8_RATE] = 983040000,
+	.plla_rates[x11_RATE] = 993484800,
+	/* PLLA1_OUT1 */
+	.plla_out0_rates[x8_RATE] = 49152000,
+	.plla_out0_rates[x11_RATE] = 45158400,
+};
+
 static const struct of_device_id graph_of_tegra_match[] = {
 	{ .compatible = "nvidia,tegra210-audio-graph-card",
 	  .data = &tegra210_data },
 	{ .compatible = "nvidia,tegra186-audio-graph-card",
 	  .data = &tegra186_data },
+	{ .compatible = "nvidia,tegra264-audio-graph-card",
+	  .data = &tegra264_data },
 	{},
 };
 MODULE_DEVICE_TABLE(of, graph_of_tegra_match);
-- 
2.17.1