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path: root/drivers/tty/serial/bfin_uart.c
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Diffstat (limited to 'drivers/tty/serial/bfin_uart.c')
-rw-r--r--drivers/tty/serial/bfin_uart.c27
1 files changed, 12 insertions, 15 deletions
diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c
index ae3cf94b146b..293ecbb00684 100644
--- a/drivers/tty/serial/bfin_uart.c
+++ b/drivers/tty/serial/bfin_uart.c
@@ -213,7 +213,7 @@ static void bfin_serial_stop_rx(struct uart_port *port)
static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
{
unsigned int status, ch, flg;
- static struct timeval anomaly_start = { .tv_sec = 0 };
+ static u64 anomaly_start;
status = UART_GET_LSR(uart);
UART_CLEAR_LSR(uart);
@@ -246,27 +246,24 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
* character time +/- some percent. So 1.5 sounds good. All other
* Blackfin families operate properly. Woo.
*/
- if (anomaly_start.tv_sec) {
- struct timeval curr;
- suseconds_t usecs;
+ if (anomaly_start > 0) {
+ u64 curr, nsecs, threshold_ns;
if ((~ch & (~ch + 1)) & 0xff)
goto known_good_char;
- do_gettimeofday(&curr);
- if (curr.tv_sec - anomaly_start.tv_sec > 1)
+ curr = ktime_get_ns();
+ nsecs = curr - anomaly_start;
+ if (nsecs >> 32)
goto known_good_char;
- usecs = 0;
- if (curr.tv_sec != anomaly_start.tv_sec)
- usecs += USEC_PER_SEC;
- usecs += curr.tv_usec - anomaly_start.tv_usec;
-
- if (usecs > UART_GET_ANOMALY_THRESHOLD(uart))
+ threshold_ns = UART_GET_ANOMALY_THRESHOLD(uart)
+ * NSEC_PER_USEC;
+ if (nsecs > threshold_ns)
goto known_good_char;
if (ch)
- anomaly_start.tv_sec = 0;
+ anomaly_start = 0;
else
anomaly_start = curr;
@@ -274,14 +271,14 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
known_good_char:
status &= ~BI;
- anomaly_start.tv_sec = 0;
+ anomaly_start = 0;
}
}
if (status & BI) {
if (ANOMALY_05000363)
if (bfin_revid() < 5)
- do_gettimeofday(&anomaly_start);
+ anomaly_start = ktime_get_ns();
uart->port.icount.brk++;
if (uart_handle_break(&uart->port))
goto ignore_char;