[PATCH 1/5] ASoC: fsl_asrc: use flat regmap cache

* [PATCH 1/5] ASoC: fsl_asrc: use flat regmap cache
@ 2016-09-19 19:30 Marek Vasut
  2016-09-19 19:30 ` [PATCH 2/5] ASoC: fsl_esai: " Marek Vasut
                   ` (6 more replies)
  0 siblings, 7 replies; 31+ messages in thread
From: Marek Vasut @ 2016-09-19 19:30 UTC (permalink / raw)
  To: alsa-devel
  Cc: Marek Vasut, Xiubo Li, Liam Girdwood, Timur Tabi, Nicolin Chen,
	Mark Brown, Fabio Estevam

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

diff --git a/sound/soc/fsl/fsl_asrc.c b/sound/soc/fsl/fsl_asrc.c
index b7157ce..1d82f68 100644
--- a/sound/soc/fsl/fsl_asrc.c
+++ b/sound/soc/fsl/fsl_asrc.c
@@ -726,7 +726,7 @@ static const struct regmap_config fsl_asrc_regmap_config = {
 	.readable_reg = fsl_asrc_readable_reg,
 	.volatile_reg = fsl_asrc_volatile_reg,
 	.writeable_reg = fsl_asrc_writeable_reg,
-	.cache_type = REGCACHE_RBTREE,
+	.cache_type = REGCACHE_FLAT,
 };
 
 /**
-- 
2.9.3

^ permalink raw reply related	[flat|nested] 31+ messages in thread