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Message-ID: <b4de808e-333-e1f9-b047-1ecadb29838e@linux.intel.com>
Date: Wed, 9 Nov 2022 13:55:07 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: delisun <delisun@...eo.com.cn>
cc: linux@...linux.org.uk,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>,
linux-serial <linux-serial@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] serial: pl011: Do not clear RX FIFO & RX interrupt in
unthrottle.
On Wed, 9 Nov 2022, delisun wrote:
> 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.
>
You should add Fixes tag.
--
i.
> Signed-off-by: delisun <delisun@...eo.com.cn>
> ---
> 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 5cdced39eafd..08034e5dcec0 100644
> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -1828,8 +1828,17 @@ 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);
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