ASoC: ak4642: Enable cache usage to fix crashes on resume

The ak4642 driver is using a regmap cache sync to restore the
configuration of the chip on resume but (as Peter observed) does not
actually define a register cache which means that the resume is never
going to work and we trigger asserts in regmap.  Fix this by enabling
caching.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reported-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org

1 files changed, 3 insertions, 0 deletions

diff --git a/sound/soc/codecs/ak4642.c b/sound/soc/codecs/ak4642.c
index 1ee8506c06c7..4d8b9e49e8d6 100644
--- a/sound/soc/codecs/ak4642.c
+++ b/sound/soc/codecs/ak4642.c
@@ -560,6 +560,7 @@ static const struct regmap_config ak4642_regmap = {
         .max_register           = FIL1_3,
         .reg_defaults           = ak4642_reg,
         .num_reg_defaults       = NUM_AK4642_REG_DEFAULTS,
+        .cache_type             = REGCACHE_RBTREE,
 };
 
 static const struct regmap_config ak4643_regmap = {
@@ -568,6 +569,7 @@ static const struct regmap_config ak4643_regmap = {
         .max_register           = SPK_MS,
         .reg_defaults           = ak4643_reg,
         .num_reg_defaults       = ARRAY_SIZE(ak4643_reg),
+        .cache_type             = REGCACHE_RBTREE,
 };
 
 static const struct regmap_config ak4648_regmap = {
@@ -576,6 +578,7 @@ static const struct regmap_config ak4648_regmap = {
         .max_register           = EQ_FBEQE,
         .reg_defaults           = ak4648_reg,
         .num_reg_defaults       = ARRAY_SIZE(ak4648_reg),
+        .cache_type             = REGCACHE_RBTREE,
 };
 
 static const struct ak4642_drvdata ak4642_drvdata = {