regmap has introduced a maple tree based register cache which makes use of this more advanced data structure which has been added to the kernel recently. Maple trees are much flatter than rbtrees, meaning that they do not grow to such depths when the register map is sparse which makes access a bit more efficient. The maple tree cache type is still a bit of a work in progress but should be effective for some devices already.

RT715 seems like a good candidate for maple tree. It is a SoundWire MBQ device and therefore supports only single register read/write operations which do not use raw I/O and will therefore save the cost of converting to and from device native format when accessing the cache while not having a negative impact from the current lack of bulk operations in maple tree cache sync. It has a moderately large and quite sparse register map which is a good fit for storing in a maple tree.

Convert to use maple tree. There should be little if any visible difference at runtime.

Signed-off-by: Mark Brown broonie@kernel.org --- sound/soc/codecs/rt715-sdw.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/rt715-sdw.c b/sound/soc/codecs/rt715-sdw.c index 4e61e16470ed..5ffe9a00dfd8 100644 --- a/sound/soc/codecs/rt715-sdw.c +++ b/sound/soc/codecs/rt715-sdw.c @@ -354,7 +354,7 @@ static const struct regmap_config rt715_regmap = { .max_register = 0x752039, /* Maximum number of register */ .reg_defaults = rt715_reg_defaults, /* Defaults */ .num_reg_defaults = ARRAY_SIZE(rt715_reg_defaults), - .cache_type = REGCACHE_RBTREE, + .cache_type = REGCACHE_MAPLE, .use_single_read = true, .use_single_write = true, .reg_read = rt715_sdw_read,

--- base-commit: f033c26de5a5734625d2dd1dc196745fae186f1b change-id: 20230412-asoc-rt715-maple-185f657063f4

Best regards,