linux-kernel - [PATCH] ASoC: tegra: Fix uninitialized flat cache warning in tegra210

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Message-ID: <20251208052040.4025612-1-sheetal@nvidia.com>
Date: Mon, 8 Dec 2025 10:50:40 +0530
From: "Sheetal ." <sheetal@...dia.com>
To: <linux-sound@...r.kernel.org>, Mark Brown <broonie@...nel.org>
CC: Liam Girdwood <lgirdwood@...il.com>, Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>, Charles Keepax
	<ckeepax@...nsource.cirrus.com>, Sander Vanheule <sander@...nheule.net>,
	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>, sheetal
	<sheetal@...dia.com>
Subject: [PATCH] ASoC: tegra: Fix uninitialized flat cache warning in tegra210_ahub

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

The tegra210_ahub driver started triggering a warning after commit
e062bdfdd6ad ("regmap: warn users about uninitialized flat cache"),
which flags drivers using REGCACHE_FLAT without register defaults.
Since the driver omits default definitions because its registers are
zero initialized, the following warning is shown:

  WARNING KERN tegra210-ahub 2900800.ahub: using zero-initialized flat cache, this may cause unexpected behavior

Switch to REGCACHE_FLAT_S which is the recommended cache type for
sparse register maps without defaults. This cache type initializes
entries on-demand from hardware, eliminating the warning while using
memory efficiently.

Fixes: e062bdfdd6ad ("regmap: warn users about uninitialized flat cache")
Signed-off-by: sheetal <sheetal@...dia.com>
---
 sound/soc/tegra/tegra210_ahub.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sound/soc/tegra/tegra210_ahub.c b/sound/soc/tegra/tegra210_ahub.c
index e795907a3963..261d9067d27b 100644
--- a/sound/soc/tegra/tegra210_ahub.c
+++ b/sound/soc/tegra/tegra210_ahub.c
@@ -2077,7 +2077,7 @@ static const struct regmap_config tegra210_ahub_regmap_config = {
 	.val_bits		= 32,
 	.reg_stride		= 4,
 	.max_register		= TEGRA210_MAX_REGISTER_ADDR,
-	.cache_type		= REGCACHE_FLAT,
+	.cache_type		= REGCACHE_FLAT_S,
 };
 
 static const struct regmap_config tegra186_ahub_regmap_config = {
@@ -2085,7 +2085,7 @@ static const struct regmap_config tegra186_ahub_regmap_config = {
 	.val_bits		= 32,
 	.reg_stride		= 4,
 	.max_register		= TEGRA186_MAX_REGISTER_ADDR,
-	.cache_type		= REGCACHE_FLAT,
+	.cache_type		= REGCACHE_FLAT_S,
 };
 
 static const struct regmap_config tegra264_ahub_regmap_config = {
@@ -2094,7 +2094,7 @@ static const struct regmap_config tegra264_ahub_regmap_config = {
 	.reg_stride		= 4,
 	.writeable_reg		= tegra264_ahub_wr_reg,
 	.max_register		= TEGRA264_MAX_REGISTER_ADDR,
-	.cache_type		= REGCACHE_FLAT,
+	.cache_type		= REGCACHE_FLAT_S,
 };
 
 static const struct tegra_ahub_soc_data soc_data_tegra210 = {
-- 
2.34.1