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asoc: codecs: Avoid spi data transfer during suspend

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SPI data transfer can happen during suspend due to race
conditions leading to NOC issues. Synchronize data transfer
and suspend to fix this issue.

Change-Id: Ia5b4d0d16d9bf4fa4a4b73e3509a7d04b45d843f
Signed-off-by: Aditya Bavanari <abavanar@codeaurora.org>
This commit is contained in:
Aditya Bavanari 2019-10-10 12:35:11 +05:30
commit d7ee50cc8e
1 changed files with 11 additions and 1 deletions
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12
asoc/codecs/wcd-spi.c
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@ -815,6 +815,15 @@ static int __wcd_spi_data_xfer(struct spi_device *spi,
return -EINVAL;
}
WCD_SPI_MUTEX_LOCK(spi, wcd_spi->clk_mutex);
if (wcd_spi_is_suspended(wcd_spi)) {
dev_dbg(&spi->dev,
"%s: SPI suspended, cannot perform transfer\n",
__func__);
ret = -EIO;
goto done;
}
WCD_SPI_MUTEX_LOCK(spi, wcd_spi->xfer_mutex);
if (msg->len == WCD_SPI_WORD_BYTE_CNT) {
if (xfer_req == WCD_SPI_XFER_WRITE)
@ -827,7 +836,8 @@ static int __wcd_spi_data_xfer(struct spi_device *spi,
ret = wcd_spi_transfer_split(spi, msg, xfer_req);
}
WCD_SPI_MUTEX_UNLOCK(spi, wcd_spi->xfer_mutex);
done:
WCD_SPI_MUTEX_UNLOCK(spi, wcd_spi->clk_mutex);
return ret;
}