From 016e2be96d4247ceacca05932f2e94d31607cc57 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Pali=20Roh=C3=A1r?= Date: Mon, 5 Sep 2022 11:31:18 +0200 Subject: [PATCH] serial: Implement flush callback MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit UART drivers have putc/puts functions which just put characters into HW transmit queue and do not wait until all data are transmitted. Implement flush callback via serial driver's pending(false) callback which waits until HW transmit all characters from the queue. Signed-off-by: Pali Rohár Reviewed-by: Simon Glass --- drivers/serial/serial-uclass.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/serial/serial-uclass.c b/drivers/serial/serial-uclass.c index 0d43e9b625..1234fe0e84 100644 --- a/drivers/serial/serial-uclass.c +++ b/drivers/serial/serial-uclass.c @@ -238,6 +238,18 @@ static void _serial_puts(struct udevice *dev, const char *str) } while (*str); } +#ifdef CONFIG_CONSOLE_FLUSH_SUPPORT +static void _serial_flush(struct udevice *dev) +{ + struct dm_serial_ops *ops = serial_get_ops(dev); + + if (!ops->pending) + return; + while (ops->pending(dev, false) > 0) + ; +} +#endif + static int __serial_getc(struct udevice *dev) { struct dm_serial_ops *ops = serial_get_ops(dev); @@ -398,6 +410,13 @@ static void serial_stub_puts(struct stdio_dev *sdev, const char *str) _serial_puts(sdev->priv, str); } +#ifdef CONFIG_CONSOLE_FLUSH_SUPPORT +static void serial_stub_flush(struct stdio_dev *sdev) +{ + _serial_flush(sdev->priv); +} +#endif + static int serial_stub_getc(struct stdio_dev *sdev) { return _serial_getc(sdev->priv); @@ -520,6 +539,7 @@ static int serial_post_probe(struct udevice *dev) sdev.priv = dev; sdev.putc = serial_stub_putc; sdev.puts = serial_stub_puts; + STDIO_DEV_ASSIGN_FLUSH(&sdev, serial_stub_flush); sdev.getc = serial_stub_getc; sdev.tstc = serial_stub_tstc; -- 2.39.5