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ASoC: codec: Disable surge protection before impedance detection

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If surge protection is enabled, it interferes with HPHL
and does not give proper impedance for high impedance cable.
Disable surge protection before impedance detection and
enable it again after impedance detection on wcd937x and wcd938x.

Change-Id: I13840b0ba9fd9ce16b90f42dcd1a25ffb928b504
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>
This commit is contained in:
Vatsal Bucha
2019-07-11 16:36:46 +05:30
parent 4f42ed04c4
commit 01a86d2895
2 changed files with 18 additions and 0 deletions
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9
asoc/codecs/wcd937x/wcd937x-mbhc.c
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@@ -547,6 +547,12 @@ static void wcd937x_wcd_mbhc_calc_impedance(struct wcd_mbhc *mbhc, uint32_t *zl,
regmap_update_bits(wcd937x->regmap,
WCD937X_ANA_MBHC_MECH, 0x01, 0x00);
/* Disable surge protection before impedance detection.
* This is done to give correct value for high impedance.
*/
regmap_update_bits(wcd937x->regmap,
WCD937X_HPH_SURGE_HPHLR_SURGE_EN, 0xC0, 0x00);
/* First get impedance on Left */
d1 = d1_a[1];
zdet_param_ptr = &zdet_param[1];
@@ -663,6 +669,9 @@ right_ch_impedance:
mbhc->hph_type = WCD_MBHC_HPH_MONO;
}
/* Enable surge protection again after impedance detection */
regmap_update_bits(wcd937x->regmap,
WCD937X_HPH_SURGE_HPHLR_SURGE_EN, 0xC0, 0xC0);
zdet_complete:
snd_soc_component_write(component, WCD937X_ANA_MBHC_BTN5, reg0);
snd_soc_component_write(component, WCD937X_ANA_MBHC_BTN6, reg1);