From: delisun <delisun@xxxxxxxxxxxx>
[ Upstream commit 032d5a71ed378ffc6a2d41a187d8488a4f9fe415 ]
Clearing the RX FIFO will cause data loss.
Copy the pl011_enabl_interrupts implementation, and remove the clear
interrupt and FIFO part of the code.
Fixes: 211565b10099 ("serial: pl011: UPSTAT_AUTORTS requires .throttle/unthrottle")
Signed-off-by: delisun <delisun@xxxxxxxxxxxx>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20221110020108.7700-1-delisun@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/tty/serial/amba-pl011.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index ca105e9baa42..7c8515f83f0a 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -1836,8 +1836,17 @@ static void pl011_enable_interrupts(struct uart_amba_port *uap)
static void pl011_unthrottle_rx(struct uart_port *port)
{
struct uart_amba_port *uap = container_of(port, struct uart_amba_port, port);
+ unsigned long flags;
- pl011_enable_interrupts(uap);
+ spin_lock_irqsave(&uap->port.lock, flags);
+
+ uap->im = UART011_RTIM;
+ if (!pl011_dma_rx_running(uap))
+ uap->im |= UART011_RXIM;
+
+ pl011_write(uap->im, uap, REG_IMSC);
+
+ spin_unlock_irqrestore(&uap->port.lock, flags);
}
static int pl011_startup(struct uart_port *port)
--
2.35.1
