diff options
author | David Dgien <dgienda125@gmail.com> | 2020-05-19 23:55:36 -0400 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2020-06-03 08:24:24 +0200 |
commit | 9baf73b9bc2891da06d9ca9fb19cc2fa457d5ad8 (patch) | |
tree | 33d6a9d3a2d26930edf94c1941ba31d7bf613168 /drivers/serial | |
parent | dc52abcc05f75b1edb04b71525c8c39bb61cb19f (diff) | |
download | barebox-9baf73b9bc2891da06d9ca9fb19cc2fa457d5ad8.tar.gz barebox-9baf73b9bc2891da06d9ca9fb19cc2fa457d5ad8.tar.xz |
serial: Add flush function to NS16550 driver
Add flush function to NS16550 to remove bad characters being printed
during reset
Signed-off-by: David Dgien <dgienda125@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/serial')
-rw-r--r-- | drivers/serial/serial_ns16550.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/serial/serial_ns16550.c b/drivers/serial/serial_ns16550.c index 5d6cec82a4..f117ab9dc1 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; |