On Tue, Jan 5, 2021 at 9:06 PM Yu-Hsuan Hsu <yuhsuan@xxxxxxxxxxxx> wrote: > It is not guaranteed that I2S RX is disabled when the kernel booting. > For example, if the kernel crashes while it is enabled, it will keep > enabled until the next time EC reboots. Reset I2S RX when probing to > fix this issue. > > Signed-off-by: Yu-Hsuan Hsu <yuhsuan@xxxxxxxxxxxx> > --- > include/linux/platform_data/cros_ec_commands.h | 1 + > sound/soc/codecs/cros_ec_codec.c | 7 +++++++ > 2 files changed, 8 insertions(+) > > diff --git a/include/linux/platform_data/cros_ec_commands.h > b/include/linux/platform_data/cros_ec_commands.h > index 86376779ab31..95889ada83a3 100644 > --- a/include/linux/platform_data/cros_ec_commands.h > +++ b/include/linux/platform_data/cros_ec_commands.h > @@ -4600,6 +4600,7 @@ enum ec_codec_i2s_rx_subcmd { > EC_CODEC_I2S_RX_SET_SAMPLE_DEPTH = 0x2, > EC_CODEC_I2S_RX_SET_DAIFMT = 0x3, > EC_CODEC_I2S_RX_SET_BCLK = 0x4, > + EC_CODEC_I2S_RX_RESET = 0x5, > EC_CODEC_I2S_RX_SUBCMD_COUNT, > }; > > I would prefer to see a separate patch to sync cros_ec_commands.h with the version in EC code to reduce future conflicts. Guenter > diff --git a/sound/soc/codecs/cros_ec_codec.c > b/sound/soc/codecs/cros_ec_codec.c > index f33a2a9654e7..28b3e2c48c86 100644 > --- a/sound/soc/codecs/cros_ec_codec.c > +++ b/sound/soc/codecs/cros_ec_codec.c > @@ -1011,6 +1011,13 @@ static int cros_ec_codec_platform_probe(struct > platform_device *pdev) > } > priv->ec_capabilities = r.capabilities; > > + /* Reset EC codec i2s rx. */ > + p.cmd = EC_CODEC_I2S_RX_RESET; > + ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX, > + (uint8_t *)&p, sizeof(p), NULL, 0); > + if (ret) > + dev_warn(dev, "failed to EC_CODEC_I2S_RESET: %d\n", ret); > + > platform_set_drvdata(pdev, priv); > > ret = devm_snd_soc_register_component(dev, > &i2s_rx_component_driver, > -- > 2.29.2.729.g45daf8777d-goog > >