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ARM: meson: serial: disable rx/tx irqs during console write

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As an attempt to stop issues with bad console output, ensure that both the
rx and tx interrupts are disabled during the console write to avoid any
problems with console and non-console being called together.

This should help with the SMP case as it should stop other cores being
signalled during the console write.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Tested-by: Carlo Caione <carlo@endlessm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ben Dooks 2015-11-18 14:41:17 +00:00 committed by Greg Kroah-Hartman
parent f1f5c1400f
commit 2561f068d9
1 changed files with 5 additions and 2 deletions
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7
drivers/tty/serial/meson_uart.c
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@ -472,7 +472,7 @@ static void meson_serial_console_write(struct console *co, const char *s,
struct uart_port *port;
unsigned long flags;
int locked;
u32 val;
u32 val, tmp;
port = meson_ports[co->index];
if (!port)
@ -489,9 +489,12 @@ static void meson_serial_console_write(struct console *co, const char *s,
}
val = readl(port->membase + AML_UART_CONTROL);
writel(val | AML_UART_TX_EN, port->membase + AML_UART_CONTROL);
val |= AML_UART_TX_EN;
tmp = val & ~(AML_UART_TX_INT_EN | AML_UART_RX_INT_EN);
writel(tmp, port->membase + AML_UART_CONTROL);
uart_console_write(port, s, count, meson_console_putchar);
writel(val, port->membase + AML_UART_CONTROL);
if (locked)
spin_unlock(&port->lock);