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_esai.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c index e927955..38bfd46 100644 --- a/sound/soc/fsl/fsl_esai.c +++ b/sound/soc/fsl/fsl_esai.c @@ -781,7 +781,7 @@ static const struct regmap_config fsl_esai_regmap_config = { .readable_reg = fsl_esai_readable_reg, .volatile_reg = fsl_esai_volatile_reg, .writeable_reg = fsl_esai_writeable_reg, - .cache_type = REGCACHE_RBTREE, + .cache_type = REGCACHE_FLAT, };
static int fsl_esai_probe(struct platform_device *pdev)