diff options
Diffstat (limited to 'chip/g/sps.c')
| -rw-r--r-- | chip/g/sps.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/chip/g/sps.c b/chip/g/sps.c index dba3129dfc..6a5fed0ee3 100644 --- a/chip/g/sps.c +++ b/chip/g/sps.c @@ -303,6 +303,8 @@ static void sps_advance_rx(int port, int data_size) */ static void sps_rx_interrupt(uint32_t port, int cs_deasserted) { + static uint8_t seen_data; + for (;;) { uint8_t *received_data = NULL; size_t data_size; @@ -311,6 +313,7 @@ static void sps_rx_interrupt(uint32_t port, int cs_deasserted) if (!data_size) break; + seen_data = 1; sps_rx_count += data_size; if (sps_rx_handler) @@ -322,16 +325,20 @@ static void sps_rx_interrupt(uint32_t port, int cs_deasserted) sps_advance_rx(port, data_size); } - if (cs_deasserted) + if (cs_deasserted) { sps_rx_handler(NULL, 0, 1); - /* - * SPI does not provide inherent flow control. Let's use this pin to - * signal the AP that the device has finished processing received - * data. - */ - gpio_set_level(GPIO_INT_AP_L, 0); - gpio_set_level(GPIO_INT_AP_L, 1); + if (seen_data) { + /* + * SPI does not provide inherent flow control. Let's + * use this pin to signal the AP that the device has + * finished processing received data. + */ + gpio_set_level(GPIO_INT_AP_L, 0); + gpio_set_level(GPIO_INT_AP_L, 1); + seen_data = 0; + } + } } static void sps_cs_deassert_interrupt(uint32_t port) |