From: Richard Fitzgerald <[email protected]> There must be a delay of at least 150us after writing SCLK_PRESENT before issuing another I2C write.
This is done using struct reg_sequence because it can specify a delay after the write and the whole sequence is written atomically. Signed-off-by: Richard Fitzgerald <[email protected]> --- sound/soc/codecs/cs42l42.c | 28 +++++++++++++++++++++++----- sound/soc/codecs/cs42l42.h | 1 + 2 files changed, 24 insertions(+), 5 deletions(-) diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c index 7898a2d52a3b7..5755f8baddbcf 100644 --- a/sound/soc/codecs/cs42l42.c +++ b/sound/soc/codecs/cs42l42.c @@ -517,6 +517,24 @@ static const struct snd_soc_dapm_route cs42l42_audio_map[] = { { "SDOUT2", NULL, "ASP TX EN" }, }; +/* Switch to SCLK. Atomic delay after the write to allow the switch to complete. */ +static const struct reg_sequence cs42l42_to_sclk_seq[] = { + { + .reg = CS42L42_OSC_SWITCH, + .def = CS42L42_SCLK_PRESENT_MASK, + .delay_us = CS42L42_CLOCK_SWITCH_DELAY_US, + }, +}; + +/* Switch to OSC. Atomic delay after the write to allow the switch to complete. */ +static const struct reg_sequence cs42l42_to_osc_seq[] = { + { + .reg = CS42L42_OSC_SWITCH, + .def = 0, + .delay_us = CS42L42_CLOCK_SWITCH_DELAY_US, + }, +}; + struct cs42l42_pll_params { u32 sclk; u8 mclk_div; @@ -809,6 +827,7 @@ static int cs42l42_set_sysclk(struct snd_soc_dai *dai, static int cs42l42_mute_stream(struct snd_soc_dai *dai, int mute, int stream) { struct snd_soc_component *component = dai->component; + struct cs42l42_private *cs42l42 = snd_soc_component_get_drvdata(component); unsigned int regval; u8 fullScaleVol; @@ -828,8 +847,8 @@ static int cs42l42_mute_stream(struct snd_soc_dai *dai, int mute, int stream) * SCLK must remain running until after this clock switch. * Without a source of clock the I2C bus doesn't work. */ - snd_soc_component_update_bits(component, CS42L42_OSC_SWITCH, - CS42L42_SCLK_PRESENT_MASK, 0); + regmap_multi_reg_write(cs42l42->regmap, cs42l42_to_osc_seq, + ARRAY_SIZE(cs42l42_to_osc_seq)); snd_soc_component_update_bits(component, CS42L42_PLL_CTL1, CS42L42_PLL_START_MASK, 0); } @@ -840,9 +859,8 @@ static int cs42l42_mute_stream(struct snd_soc_dai *dai, int mute, int stream) CS42L42_PLL_START_MASK, 1); /* Mark SCLK as present, turn off internal oscillator */ - snd_soc_component_update_bits(component, CS42L42_OSC_SWITCH, - CS42L42_SCLK_PRESENT_MASK, - CS42L42_SCLK_PRESENT_MASK); + regmap_multi_reg_write(cs42l42->regmap, cs42l42_to_sclk_seq, + ARRAY_SIZE(cs42l42_to_sclk_seq)); } cs42l42->stream_use |= 1 << stream; diff --git a/sound/soc/codecs/cs42l42.h b/sound/soc/codecs/cs42l42.h index 1df9577e367c1..a0c87f2326e69 100644 --- a/sound/soc/codecs/cs42l42.h +++ b/sound/soc/codecs/cs42l42.h @@ -755,6 +755,7 @@ #define CS42L42_NUM_SUPPLIES 5 #define CS42L42_BOOT_TIME_US 3000 +#define CS42L42_CLOCK_SWITCH_DELAY_US 150 static const char *const cs42l42_supply_names[CS42L42_NUM_SUPPLIES] = { "VA", -- 2.30.1
