Linux Sound subsystem development
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From: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
To: Mark Brown <broonie@kernel.org>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Thierry Reding <thierry.reding@kernel.org>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	Sheetal <sheetal@nvidia.com>
Cc: linux-sound@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH 2/3] ASoC: tegra210_i2s: sort the Tegra264 register default table
Date: Wed,  5 Aug 2026 15:27:47 +0300	[thread overview]
Message-ID: <20260805122748.13090-3-peter.ujfalusi@linux.intel.com> (raw)
In-Reply-To: <20260805122748.13090-1-peter.ujfalusi@linux.intel.com>

reg_defaults must be sorted by ascending register address, as
regcache_lookup_reg() locates entries in it with bsearch().  See commit
fd80df352ba1 ("regcache: Add support for sorting defaults arrays").

TEGRA264_I2S_ENABLE (0x100), TEGRA264_I2S_RX_FIFO_WR_ACCESS_MODE (0x30)
and TEGRA264_I2S_TX_FIFO_RD_ACCESS_MODE (0xb0) are listed at the end of
the table, after TEGRA264_I2S_TIMING (0x130), which leaves 4 of the 9
entries unreachable.  regcache_reg_needs_sync() then cannot compare them
against their default and reports that a sync is needed, so they are
written to the device on every regcache_sync() even when they were never
touched.

Sort the table by register address.

Fixes: b3354438d898 ("ASoC: tegra: I2S: Add Tegra264 support")
Cc: stable@vger.kernel.org
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
---
 sound/soc/tegra/tegra210_i2s.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sound/soc/tegra/tegra210_i2s.c b/sound/soc/tegra/tegra210_i2s.c
index fd49d2d6ee49..e4d11518ff01 100644
--- a/sound/soc/tegra/tegra210_i2s.c
+++ b/sound/soc/tegra/tegra210_i2s.c
@@ -38,13 +38,13 @@ static const struct reg_default tegra210_i2s_reg_defaults[] = {
 static const struct reg_default tegra264_i2s_reg_defaults[] = {
 	{ TEGRA210_I2S_RX_INT_MASK, 0x00000003 },
 	{ TEGRA210_I2S_RX_CIF_CTRL, 0x00003f00 },
+	{ TEGRA264_I2S_RX_FIFO_WR_ACCESS_MODE, 0x1 },
 	{ TEGRA264_I2S_TX_INT_MASK, 0x00000003 },
 	{ TEGRA264_I2S_TX_CIF_CTRL, 0x00003f00 },
+	{ TEGRA264_I2S_TX_FIFO_RD_ACCESS_MODE, 0x1 },
+	{ TEGRA264_I2S_ENABLE, 0x1 },
 	{ TEGRA264_I2S_CG, 0x1 },
 	{ TEGRA264_I2S_TIMING, 0x0000001f },
-	{ TEGRA264_I2S_ENABLE, 0x1 },
-	{ TEGRA264_I2S_RX_FIFO_WR_ACCESS_MODE, 0x1 },
-	{ TEGRA264_I2S_TX_FIFO_RD_ACCESS_MODE, 0x1 },
 };
 
 static void tegra210_i2s_set_slot_ctrl(struct tegra210_i2s *i2s,
-- 
2.55.0


  parent reply	other threads:[~2026-08-05 12:27 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-05 12:27 [PATCH 0/3] ASoC: tegra: sort the reg_defaults tables Peter Ujfalusi
2026-08-05 12:27 ` [PATCH 1/3] ASoC: tegra210_i2s: sort the register default table Peter Ujfalusi
2026-08-05 12:27 ` Peter Ujfalusi [this message]
2026-08-05 12:27 ` [PATCH 3/3] ASoC: tegra210_mixer: " Peter Ujfalusi

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