[PATCH] ASoC: tegra: Fix uninitialized flat cache warning in tegra210_ahub

["Sheetal ." <sheetal@nvidia.com>]

From: sheetal <sheetal@nvidia.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@nvidia.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