Add flush function to NS16550 to remove bad characters being printed
during reset
Signed-off-by: David Dgien <dgienda125@xxxxxxxxx>
---
drivers/serial/serial_ns16550.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/serial/serial_ns16550.c b/drivers/serial/serial_ns16550.c
index 5d6cec82a..f117ab9dc 100644
--- a/drivers/serial/serial_ns16550.c
+++ b/drivers/serial/serial_ns16550.c
@@ -308,6 +308,17 @@ static int ns16550_tstc(struct console_device *cdev)
return ((ns16550_read(cdev, lsr) & LSR_DR) != 0);
}
+/**
+ * @brief Flush remaining characters in serial device
+ *
+ * @param[in] cdev pointer to console device
+ */
+static void ns16550_flush(struct console_device *cdev)
+{
+ /* Loop Doing Nothing */
+ while ((ns16550_read(cdev, lsr) & LSR_TEMT) == 0) ;
+}
+
static void ns16550_probe_dt(struct device_d *dev, struct ns16550_priv *priv)
{
struct device_node *np = dev->device_node;
@@ -501,6 +512,7 @@ static int ns16550_probe(struct device_d *dev)
cdev->putc = ns16550_putc;
cdev->getc = ns16550_getc;
cdev->setbrg = ns16550_setbaudrate;
+ cdev->flush = ns16550_flush;
cdev->linux_console_name = devtype->linux_console_name;
priv->fcrval = FCRVAL;
--
2.26.2
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