[PATCH] ASoC: tas6424: Allow disabling auto diagnostics for faster power-on

From: Jean-Jacques Hiblot
Date: Thu May 03 2018 - 03:36:27 EST


The TAS6424 incorporates both DC-load and AC-load diagnostics which are
used to determine the status of the load. The DC diagnostics runs when any
channel is directed to leave the Hi-Z state and enter the MUTE or PLAY
state.
The DC diagnostics are turned on by default but, if a fast startup without
diagnostics is required, the diagnostics can be disabled using a dedicated
ALSA control.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@xxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
sound/soc/codecs/tas6424.c | 13 +++++++++++--
sound/soc/codecs/tas6424.h | 4 ++++
2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/tas6424.c b/sound/soc/codecs/tas6424.c
index 89fd0c1b3903..14999b999fd3 100644
--- a/sound/soc/codecs/tas6424.c
+++ b/sound/soc/codecs/tas6424.c
@@ -64,6 +64,8 @@ static const struct snd_kcontrol_new tas6424_snd_controls[] = {
TAS6424_CH3_VOL_CTRL, 0, 0xff, 0, dac_tlv),
SOC_SINGLE_TLV("Speaker Driver CH4 Playback Volume",
TAS6424_CH4_VOL_CTRL, 0, 0xff, 0, dac_tlv),
+ SOC_SINGLE_STROBE("Auto Diagnostics Switch", TAS6424_DC_DIAG_CTRL1,
+ TAS6424_LDGBYPASS_SHIFT, 1),
};

static int tas6424_dac_event(struct snd_soc_dapm_widget *w,
@@ -297,6 +299,11 @@ static int tas6424_power_on(struct snd_soc_component *component)
struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
int ret;
u8 chan_states;
+ int no_auto_diags = 0;
+ unsigned int reg_val;
+
+ if (!regmap_read(tas6424->regmap, TAS6424_DC_DIAG_CTRL1, &reg_val))
+ no_auto_diags = reg_val & TAS6424_LDGBYPASS_MASK;

ret = regulator_bulk_enable(ARRAY_SIZE(tas6424->supplies),
tas6424->supplies);
@@ -327,9 +334,11 @@ static int tas6424_power_on(struct snd_soc_component *component)
snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, chan_states);

/* any time we come out of HIZ, the output channels automatically run DC
- * load diagnostics, wait here until this completes
+ * load diagnostics if autodiagnotics are enabled. wait here until this
+ * completes.
*/
- msleep(230);
+ if (!no_auto_diags)
+ msleep(230);

return 0;
}
diff --git a/sound/soc/codecs/tas6424.h b/sound/soc/codecs/tas6424.h
index 430588328a06..b5958c45ed0e 100644
--- a/sound/soc/codecs/tas6424.h
+++ b/sound/soc/codecs/tas6424.h
@@ -111,6 +111,10 @@
TAS6424_CH3_STATE_DIAG | \
TAS6424_CH4_STATE_DIAG)

+/* TAS6424_DC_DIAG_CTRL1 */
+#define TAS6424_LDGBYPASS_SHIFT 0
+#define TAS6424_LDGBYPASS_MASK BIT(TAS6424_LDGBYPASS_SHIFT)
+
/* TAS6424_GLOB_FAULT1_REG */
#define TAS6424_FAULT_CLOCK BIT(4)
#define TAS6424_FAULT_PVDD_OV BIT(3)
--
2.17.0