The patch

ASoC: nau8825: Disable short Frame Sync detection logic

has been applied to the asoc tree at

git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git

All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying to this mail.

Thanks, Mark

From 93dfec758ff2d0292be35cafd239e929a8973b73 Mon Sep 17 00:00:00 2001

From: John Hsu KCHSU0@nuvoton.com Date: Fri, 11 Nov 2016 12:34:12 +0800 Subject: [PATCH] ASoC: nau8825: Disable short Frame Sync detection logic

If the short Frame Sync detection logic enabled, the logic will check the short frame sync threshold. If frame sync is less than the setting; for example, frame sync less than 252 MCLK, the short frame sync signal is flagged, digital filter temporary mute and skip that data.

If the system was intended for sampling rate change which could create temporary short frame sync and not enough MIPS to run the digital filter. But the situation doesn't happen in ALSA architecure. Thus the Frame Sync is always stable, then no require to do the detection. Therefore, the dirver disables the function for better performance.

Signed-off-by: John Hsu KCHSU0@nuvoton.com Signed-off-by: Mark Brown broonie@kernel.org --- sound/soc/codecs/nau8825.c | 3 +++ sound/soc/codecs/nau8825.h | 5 +++++ 2 files changed, 8 insertions(+)

diff --git a/sound/soc/codecs/nau8825.c b/sound/soc/codecs/nau8825.c index e643be91d762..0db618b2f2b8 100644 --- a/sound/soc/codecs/nau8825.c +++ b/sound/soc/codecs/nau8825.c @@ -1811,6 +1811,9 @@ static void nau8825_init_regs(struct nau8825 *nau8825) NAU8825_DACL_CH_SEL_MASK, NAU8825_DACL_CH_SEL_L); regmap_update_bits(nau8825->regmap, NAU8825_REG_DACR_CTRL, NAU8825_DACL_CH_SEL_MASK, NAU8825_DACL_CH_SEL_R); + /* Disable short Frame Sync detection logic */ + regmap_update_bits(regmap, NAU8825_REG_LEFT_TIME_SLOT, + NAU8825_DIS_FS_SHORT_DET, NAU8825_DIS_FS_SHORT_DET); }

static const struct regmap_config nau8825_regmap_config = { diff --git a/sound/soc/codecs/nau8825.h b/sound/soc/codecs/nau8825.h index 1c63e2abafa9..6365c9c3f8d9 100644 --- a/sound/soc/codecs/nau8825.h +++ b/sound/soc/codecs/nau8825.h @@ -246,6 +246,11 @@ #define NAU8825_I2S_MS_SLAVE (0 << NAU8825_I2S_MS_SFT) #define NAU8825_I2S_BLK_DIV_MASK 0x7

+/* LEFT_TIME_SLOT (0x1e) */ +#define NAU8825_FS_ERR_CMP_SEL_SFT 14 +#define NAU8825_FS_ERR_CMP_SEL_MASK (0x3 << NAU8825_FS_ERR_CMP_SEL_SFT) +#define NAU8825_DIS_FS_SHORT_DET (1 << 13) + /* BIQ_CTRL (0x20) */ #define NAU8825_BIQ_WRT_SFT 4 #define NAU8825_BIQ_WRT_EN (1 << NAU8825_BIQ_WRT_SFT)