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ASoC: cs42l42: make HSBIAS_SENSE_EN optional 

HSBIAS_SENSE_EN configures HSBIAS output current sense through
the external 2.21-k resistor. HSBIAS_SENSE is hardware feature to reduce
the potential pop noise during the headset plug out slowly. But on some
platforms ESD voltage will affect it causing test to fail, especially
with CTIA headset type. For different hardware setups, a designer might
want to tweak default behavior.

Signed-off-by: Vitaly Rodionov <vitalyr@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210511145220.125760-1-vitalyr@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Vitaly Rodionov 2021-05-11 15:52:20 +01:00 committed by Mark Brown
parent 9b7493468f
commit c9f2e3c3dd
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GPG Key ID: 24D68B725D5487D0
3 changed files with 14 additions and 1 deletions
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7
Documentation/devicetree/bindings/sound/cs42l42.txt
View File

@ -81,6 +81,13 @@ Optional properties:
< x1 x2 x3 x4 >
Default = < 15 8 4 1>
- cirrus,hs-bias-sense-disable: This is boolean property. If present the
HSBIAS sense is disabled. Configures HSBIAS output current sense through
the external 2.21-k resistor. HSBIAS_SENSE is hardware feature to reduce
the potential pop noise during the headset plug out slowly. But on some
platforms ESD voltage will affect it causing test to fail, especially
with CTIA headset type. For different hardware setups, a designer might
want to tweak default behavior.
Example:

7
sound/soc/codecs/cs42l42.c
View File

@ -1033,7 +1033,7 @@ static void cs42l42_process_hs_type_detect(struct cs42l42_private *cs42l42)
CS42L42_AUTO_HSBIAS_HIZ_MASK |
CS42L42_TIP_SENSE_EN_MASK |
CS42L42_HSBIAS_SENSE_TRIP_MASK,
(1 << CS42L42_HSBIAS_SENSE_EN_SHIFT) |
(cs42l42->hs_bias_sense_en << CS42L42_HSBIAS_SENSE_EN_SHIFT) |
(1 << CS42L42_AUTO_HSBIAS_HIZ_SHIFT) |
(0 << CS42L42_TIP_SENSE_EN_SHIFT) |
(3 << CS42L42_HSBIAS_SENSE_TRIP_SHIFT));
@ -1808,6 +1808,11 @@ static int cs42l42_handle_device_data(struct device *dev,
(cs42l42->hs_bias_ramp_rate <<
CS42L42_HSBIAS_RAMP_SHIFT));
if (device_property_read_bool(dev, "cirrus,hs-bias-sense-disable"))
cs42l42->hs_bias_sense_en = 0;
else
cs42l42->hs_bias_sense_en = 1;
return 0;
}

1
sound/soc/codecs/cs42l42.h
View File

@ -787,6 +787,7 @@ struct cs42l42_private {
u8 bias_thresholds[CS42L42_NUM_BIASES];
u8 hs_bias_ramp_rate;
u8 hs_bias_ramp_time;
u8 hs_bias_sense_en;
u8 stream_use;
};