diff options
Diffstat (limited to 'common/usb_pd_tcpc.c')
| -rw-r--r-- | common/usb_pd_tcpc.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/common/usb_pd_tcpc.c b/common/usb_pd_tcpc.c index 152775bbc0..11bc399b5e 100644 --- a/common/usb_pd_tcpc.c +++ b/common/usb_pd_tcpc.c @@ -261,7 +261,12 @@ static struct pd_port_controller { static int rx_buf_is_full(int port) { - /* Buffer is full if the tail is 1 ahead of head */ + /* + * TODO: Refactor these to use the incrementing-counter idiom instead of + * the wrapping-counter idiom to reclaim the last buffer entry. + * + * Buffer is full if the tail is 1 ahead of head. + */ int diff = pd[port].rx_buf_tail - pd[port].rx_buf_head; return (diff == 1) || (diff == -RX_BUFFER_SIZE); } @@ -272,6 +277,11 @@ int rx_buf_is_empty(int port) return pd[port].rx_buf_tail == pd[port].rx_buf_head; } +void rx_buf_clear(int port) +{ + pd[port].rx_buf_tail = pd[port].rx_buf_head; +} + static void rx_buf_increment(int port, int *buf_ptr) { *buf_ptr = *buf_ptr == RX_BUFFER_SIZE ? 0 : *buf_ptr + 1; |