diff options
Diffstat (limited to 'chip/lm4')
| -rw-r--r-- | chip/lm4/spi.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/chip/lm4/spi.c b/chip/lm4/spi.c index 3fd3bc96de..0e43642bca 100644 --- a/chip/lm4/spi.c +++ b/chip/lm4/spi.c @@ -64,8 +64,10 @@ int spi_transaction(const struct spi_device_t *spi_device, { int totallen = txlen + rxlen; int txcount = 0, rxcount = 0; + static struct mutex spi_mutex; volatile uint32_t dummy __attribute__((unused)); + mutex_lock(&spi_mutex); /* Empty the receive FIFO */ while (LM4_SSI_SR(0) & LM4_SSI_SR_RNE) dummy = LM4_SSI_DR(0); @@ -104,6 +106,7 @@ int spi_transaction(const struct spi_device_t *spi_device, /* End transaction */ gpio_set_level(spi_device->gpio_cs, 1); + mutex_unlock(&spi_mutex); return EC_SUCCESS; } |