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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 <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230717-regmap-cache-check-v1-3-73ef688afae3@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Mark Brown 2023-07-17 21:33:05 +01:00
parent d881ee5a87
commit 99aae70551
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 3 additions and 6 deletions
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9
sound/hda/hdac_regmap.c
View File

@ -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;