Commit 9cabe26e authored by Al Cooper's avatar Al Cooper Committed by Greg Kroah-Hartman

serial: 8250_bcm7271: UART errors after resuming from S2

There is a small window in time during resume where the hardware
flow control signal RTS can be asserted (which allows a sender to
resume sending data to the UART) but the baud rate has not yet
been restored. This will cause corrupted data and FRAMING, OVERRUN
and BREAK errors. This is happening because the MCTRL register is
shadowed in uart_port struct and is later used during resume to set
the MCTRL register during both serial8250_do_startup() and
uart_resume_port(). Unfortunately, serial8250_do_startup()
happens before the UART baud rate is restored. The fix is to clear
the shadowed mctrl value at the end of suspend and restore it at the
end of resume.

Fixes: 41a46948 ("serial: 8250: Add new 8250-core based Broadcom STB driver")
Acked-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarAl Cooper <alcooperx@gmail.com>
Link: https://lore.kernel.org/r/20211201201402.47446-1-alcooperx@gmail.comSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent bb1201d4
......@@ -237,6 +237,7 @@ struct brcmuart_priv {
u32 rx_err;
u32 rx_timeout;
u32 rx_abort;
u32 saved_mctrl;
};
static struct dentry *brcmuart_debugfs_root;
......@@ -1133,16 +1134,27 @@ static int brcmuart_remove(struct platform_device *pdev)
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);
/*
* This will prevent resume from enabling RTS before the
* baud rate has been resored.
*/
priv->saved_mctrl = port->mctrl;
port->mctrl = 0;
return 0;
}
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;
int ret;
ret = clk_prepare_enable(priv->baud_mux_clk);
......@@ -1165,6 +1177,7 @@ 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;
return 0;
}
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment