diff options
| author |   Gergo Koteles <soyer@irl.hu> | 2023-12-22 00:48:56 +0100 |
|---|---|---|
| committer |   Takashi Iwai <tiwai@suse.de> | 2023-12-29 13:41:04 +0100 |
| commit | 6dad45f4d28977bd1948973107cf325d431e5b7e (patch) | |
| tree | 15fb3c806889b50e4ae09d50658a8425d3da6758 /sound/soc/codecs/tas2781-comlib.c | |
| parent | ALSA: hda: cs35l41: Only add SPI CS GPIO if SPI is enabled in kernel (diff) | |
| download | wireguard-linux-6dad45f4d28977bd1948973107cf325d431e5b7e.tar.xz wireguard-linux-6dad45f4d28977bd1948973107cf325d431e5b7e.zip | |
ALSA: hda/tas2781: do not use regcache
There are two problems with using regcache in this module.
The amplifier has 3 addressing levels (BOOK, PAGE, REG). The firmware
contains blocks that must be written to BOOK 0x8C. The regcache doesn't
know anything about BOOK, so regcache_sync writes invalid values to the
actual BOOK.
The module handles 2 or more separate amplifiers. The amplifiers have
different register values, and the module uses only one regmap/regcache
for all the amplifiers. The regcache_sync only writes the last amplifier
used.
The module successfully restores all the written register values (RC
profile, program, configuration, calibration) without regcache.
Remove regcache functions and set regmap cache_type to REGCACHE_NONE.
Link: https://lore.kernel.org/r/21a183b5a08cb23b193af78d4b1114cc59419272.1701906455.git.soyer@irl.hu/
Fixes: 5be27f1e3ec9 ("ALSA: hda/tas2781: Add tas2781 HDA driver")
Acked-by: Mark Brown <broonie@kernel.org>
CC: stable@vger.kernel.org
Signed-off-by: Gergo Koteles <soyer@irl.hu>
Link: https://lore.kernel.org/r/491aeed0e2eecc3b704ec856f815db21bad3ba0e.1703202126.git.soyer@irl.hu
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/soc/codecs/tas2781-comlib.c')
| -rw-r--r-- | sound/soc/codecs/tas2781-comlib.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/soc/codecs/tas2781-comlib.c b/sound/soc/codecs/tas2781-comlib.c index ffb26e4a7e2f..933cd008e9f5 100644 --- a/sound/soc/codecs/tas2781-comlib.c +++ b/sound/soc/codecs/tas2781-comlib.c @@ -39,7 +39,7 @@ static const struct regmap_range_cfg tasdevice_ranges[] = { static const struct regmap_config tasdevice_regmap = { .reg_bits = 8, .val_bits = 8, - .cache_type = REGCACHE_RBTREE, + .cache_type = REGCACHE_NONE, .ranges = tasdevice_ranges, .num_ranges = ARRAY_SIZE(tasdevice_ranges), .max_register = 256 * 128, |