ASoC: tegra: Fix uninitialized flat cache warning in tegra210_ahub

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.

Signed-off-by: sheetal <sheetal@nvidia.com>
Link: https://patch.msgid.link/20251208052040.4025612-1-sheetal@nvidia.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/tegra/tegra210_ahub.c b/sound/soc/tegra/tegra210_ahub.c
index e795907a3963afcffae4b92e7878562fe1aa4a39..261d9067d27b60d0c92bbf0a9458628b3bed3b0b 100644 (file)
--- 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 = {