drm/fsl-dcu: use flat regmap cache

commit ce492b3b8f99cf9d2f807ec22d8805c996a09503 upstream.

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:2755 lockdep_trace_alloc+0x15c/0x160()
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 FSL DCU driver uses MMIO, the regmap bus of type
regmap_mmio is being used which has fast_io set to true.

Use flat regmap cache and specify max register to be large
enouth to cover all registers available in LS1021a and Vybrids
register space.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
index e8d9337a66d8704805ad62121714f95be91a340c..77886f1182f151c74b832bfe3f9187b20fc4811a 100644 (file)
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
@@ -40,9 +40,10 @@ static const struct regmap_config fsl_dcu_regmap_config = {
        .reg_bits = 32,
        .reg_stride = 4,
        .val_bits = 32,
-       .cache_type = REGCACHE_RBTREE,
+       .cache_type = REGCACHE_FLAT,
 
        .volatile_reg = fsl_dcu_drm_is_volatile_reg,
+       .max_register = 0x11fc,
 };
 
 static int fsl_dcu_drm_irq_init(struct drm_device *dev)