On Wed, Jun 29, 2022 at 09:02:08AM -0700, Florian Fainelli wrote:
> From: Doug Berger <opendmb@xxxxxxxxx>
>
> Commit 9cabe26e65a8 ("serial: 8250_bcm7271: UART errors after resuming
> from S2") prevented an early enabling of RTS during resume, but it did
> not actively restore the RTS state after resume.
>
> Fixes: 9cabe26e65a8 ("serial: 8250_bcm7271: UART errors after resuming from S2")
> Signed-off-by: Doug Berger <opendmb@xxxxxxxxx>
> Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
> ---
> drivers/tty/serial/8250/8250_bcm7271.c | 24 ++++++++++++++++++------
> 1 file changed, 18 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/tty/serial/8250/8250_bcm7271.c b/drivers/tty/serial/8250/8250_bcm7271.c
> index 9b878d023dac..b9cea38c8aff 100644
> --- a/drivers/tty/serial/8250/8250_bcm7271.c
> +++ b/drivers/tty/serial/8250/8250_bcm7271.c
> @@ -1139,16 +1139,19 @@ static int __maybe_unused brcmuart_suspend(struct device *dev)
> struct brcmuart_priv *priv = dev_get_drvdata(dev);
> struct uart_8250_port *up = serial8250_get_port(priv->line);
> struct uart_port *port = &up->port;
> -
> - serial8250_suspend_port(priv->line);
> - clk_disable_unprepare(priv->baud_mux_clk);
> + unsigned long flags;
>
> /*
> * This will prevent resume from enabling RTS before the
> - * baud rate has been resored.
> + * baud rate has been restored.
> */
> + spin_lock_irqsave(&port->lock, flags);
> priv->saved_mctrl = port->mctrl;
> - port->mctrl = 0;
> + port->mctrl &= ~TIOCM_RTS;
> + spin_unlock_irqrestore(&port->lock, flags);
> +
> + serial8250_suspend_port(priv->line);
> + clk_disable_unprepare(priv->baud_mux_clk);
>
> return 0;
> }
> @@ -1158,6 +1161,7 @@ static int __maybe_unused brcmuart_resume(struct device *dev)
> struct brcmuart_priv *priv = dev_get_drvdata(dev);
> struct uart_8250_port *up = serial8250_get_port(priv->line);
> struct uart_port *port = &up->port;
> + unsigned long flags;
> int ret;
>
> ret = clk_prepare_enable(priv->baud_mux_clk);
> @@ -1180,7 +1184,15 @@ static int __maybe_unused brcmuart_resume(struct device *dev)
> start_rx_dma(serial8250_get_port(priv->line));
> }
> serial8250_resume_port(priv->line);
> - port->mctrl = priv->saved_mctrl;
> +
> + if (priv->saved_mctrl & TIOCM_RTS) {
> + /* Restore RTS */
> + spin_lock_irqsave(&port->lock, flags);
> + port->mctrl |= TIOCM_RTS;
> + spin_unlock_irqrestore(&port->lock, flags);
> + port->ops->set_mctrl(port, port->mctrl);
> + }
> +
> return 0;
> }
>
> --
> 2.25.1
>
Hi,
This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him
a patch that has triggered this response. He used to manually respond
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