Hi Il lun 5 set 2022, 11:32 Pali Rohár <[email protected]> ha scritto:
> 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. > This is a drain if you want to wait. Is not the right terminology? Michael > Signed-off-by: Pali Rohár <[email protected]> > --- > 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 30650e37b0d7..be6502f3d24c 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; > > -- > 2.20.1 > >
