ASoC: nau8825: make crosstalk function optional

Make crosstalk functoin optional.
The jack detection can speed up without crosstalk detection.
Let the decision of function usage to platform design.

The patch helps the issue concern as follows:
Google issue 35574278: Chell_headphone pop back from S3

There is a concern as follows:
cras getting blocked for 2 seconds (worst-case 3 seconds)
As I understand, ChromeOS expects resume finishes in 1 seconds.
Video/Audio playing after 3 seconds of resume seems against the spec.
If we really have to make the choice I would choose pop noise instead
of waiting for 3 seconds.

Signed-off-by: John Hsu <KCHSU0@nuvoton.com>
Signed-off-by: John Hsu <supercraig0719@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

2 files changed, 6 insertions, 1 deletions

diff --git a/sound/soc/codecs/nau8825.c b/sound/soc/codecs/nau8825.c
index 503a6d8130b7..a8c7a556a6a8 100644
--- a/sound/soc/codecs/nau8825.c
+++ b/sound/soc/codecs/nau8825.c
@@ -1686,7 +1686,7 @@ static irqreturn_t nau8825_interrupt(int irq, void *data)
         } else if (active_irq & NAU8825_HEADSET_COMPLETION_IRQ) {
                 if (nau8825_is_jack_inserted(regmap)) {
                         event |= nau8825_jack_insert(nau8825);
-                        if (!nau8825->high_imped) {
+                        if (!nau8825->xtalk_bypass && !nau8825->high_imped) {
                                 /* Apply the cross talk suppression in the
                                  * headset without high impedance.
                                  */
@@ -2504,6 +2504,10 @@ static int nau8825_read_device_properties(struct device *dev,
                 &nau8825->jack_eject_debounce);
         if (ret)
                 nau8825->jack_eject_debounce = 0;
+        ret = device_property_read_u32(dev, "nuvoton,crosstalk-bypass",
+                &nau8825->xtalk_bypass);
+        if (ret)
+                nau8825->xtalk_bypass = 1;
 
         nau8825->mclk = devm_clk_get(dev, "mclk");
         if (PTR_ERR(nau8825->mclk) == -EPROBE_DEFER) {
diff --git a/sound/soc/codecs/nau8825.h b/sound/soc/codecs/nau8825.h
index 514fd13c2f46..8aee5c8647ae 100644
--- a/sound/soc/codecs/nau8825.h
+++ b/sound/soc/codecs/nau8825.h
@@ -476,6 +476,7 @@ struct nau8825 {
         int xtalk_event_mask;
         bool xtalk_protect;
         int imp_rms[NAU8825_XTALK_IMM];
+        int xtalk_bypass;
 };
 
 int nau8825_enable_jack_detect(struct snd_soc_codec *codec,