[alsa-devel] [PATCH 3/5] ASoC: fsl_spdif: use flat regmap cache

[Marek Vasut]

Same as commit ce492b3b8f99cf9d2f807ec22d8805c996a09503
Subject: drm/fsl-dcu: use flat regmap cache

Using flat regmap cache instead of RB-tree to avoid the following
lockdep warning on driver load:
WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:2871 lockdep_trace_alloc+0x104/0x128
DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags))

The RB-tree regmap cache needs to allocate new space on first
writes. However, allocations in an atomic context (e.g. when a
spinlock is held) are not allowed. The function regmap_write
calls map->lock, which acquires a spinlock in the fast_io case.
Since the driver uses MMIO, the regmap bus of type regmap_mmio
is being used which has fast_io set to true.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Fabio Estevam <fabio.estevam at nxp.com>
Cc: Liam Girdwood <lgirdwood at gmail.com>
Cc: Mark Brown <broonie at kernel.org>
Cc: Nicolin Chen <nicoleotsuka at gmail.com>
Cc: Timur Tabi <timur at tabi.org>
Cc: Xiubo Li <Xiubo.Lee at gmail.com>
---
 sound/soc/fsl/fsl_spdif.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/fsl/fsl_spdif.c b/sound/soc/fsl/fsl_spdif.c
index beec793..1ff467c 100644
--- a/sound/soc/fsl/fsl_spdif.c
+++ b/sound/soc/fsl/fsl_spdif.c
@@ -1103,7 +1103,7 @@ static const struct regmap_config fsl_spdif_regmap_config = {
 	.readable_reg = fsl_spdif_readable_reg,
 	.volatile_reg = fsl_spdif_volatile_reg,
 	.writeable_reg = fsl_spdif_writeable_reg,
-	.cache_type = REGCACHE_RBTREE,
+	.cache_type = REGCACHE_FLAT,
 };
 
 static u32 fsl_spdif_txclk_caldiv(struct fsl_spdif_priv *spdif_priv,
-- 
2.9.3