From 99aae70551f99536936438bbcfc562df69eeb79c Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Mon, 17 Jul 2023 21:33:05 +0100 Subject: ALSA: hda: Use regcache_reg_cached() rather than open coding The HDA driver intentionally drops repeated writes to registers in some circumstances, beyond the suppression of noop writes that regmap does in regmap_update_bits(). It does this by checking if the register is cached before doing a regmap_update_bits(), now we have an API for querying this directly use it directly rather than trying a read in cache only mode making the code a little clearer. Reviewed-by: Takashi Iwai Signed-off-by: Mark Brown Link: https://lore.kernel.org/r/20230717-regmap-cache-check-v1-3-73ef688afae3@kernel.org Signed-off-by: Mark Brown --- sound/hda/hdac_regmap.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) (limited to 'sound') diff --git a/sound/hda/hdac_regmap.c b/sound/hda/hdac_regmap.c index 9b1bcabd8414..97cee096a286 100644 --- a/sound/hda/hdac_regmap.c +++ b/sound/hda/hdac_regmap.c @@ -556,17 +556,14 @@ EXPORT_SYMBOL_GPL(snd_hdac_regmap_update_raw); static int reg_raw_update_once(struct hdac_device *codec, unsigned int reg, unsigned int mask, unsigned int val) { - unsigned int orig; - int err; + int err = 0; if (!codec->regmap) return reg_raw_update(codec, reg, mask, val); mutex_lock(&codec->regmap_lock); - regcache_cache_only(codec->regmap, true); - err = regmap_read(codec->regmap, reg, &orig); - regcache_cache_only(codec->regmap, false); - if (err < 0) + /* Discard any updates to already initialised registers. */ + if (!regcache_reg_cached(codec->regmap, reg)) err = regmap_update_bits(codec->regmap, reg, mask, val); mutex_unlock(&codec->regmap_lock); return err; -- cgit v1.2.3