From: Pali Rohár <pali@xxxxxxxxxx>
commit 54ca955b5a4024e2ce0f206b03adb7109bc4da26 upstream.
Commit c685af1108d7 ("serial: mvebu-uart: fix tx lost characters") fixed tx
lost characters at low baud rates but started causing tx lost characters
when kernel is going to power off or reboot.
TX_EMP tells us when transmit queue is empty therefore all characters were
transmitted. TX_RDY tells us when CPU can send a new character.
Therefore we need to use different check prior transmitting new character
and different check after all characters were sent.
This patch splits polling code into two functions: wait_for_xmitr() which
waits for TX_RDY and wait_for_xmite() which waits for TX_EMP.
When rebooting A3720 platform without this patch on UART is print only:
[ 42.699�
And with this patch on UART is full output:
[ 39.530216] reboot: Restarting system
Fixes: c685af1108d7 ("serial: mvebu-uart: fix tx lost characters")
Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20201223191931.18343-1-pali@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/mvebu-uart.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/drivers/tty/serial/mvebu-uart.c
+++ b/drivers/tty/serial/mvebu-uart.c
@@ -637,6 +637,14 @@ static void wait_for_xmitr(struct uart_p
(val & STAT_TX_RDY(port)), 1, 10000);
}
+static void wait_for_xmite(struct uart_port *port)
+{
+ u32 val;
+
+ readl_poll_timeout_atomic(port->membase + UART_STAT, val,
+ (val & STAT_TX_EMP), 1, 10000);
+}
+
static void mvebu_uart_console_putchar(struct uart_port *port, int ch)
{
wait_for_xmitr(port);
@@ -664,7 +672,7 @@ static void mvebu_uart_console_write(str
uart_console_write(port, s, count, mvebu_uart_console_putchar);
- wait_for_xmitr(port);
+ wait_for_xmite(port);
if (ier)
writel(ier, port->membase + UART_CTRL(port));
