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ARM: meson: serial: only disable tx irq on stop 

Since disabling the transmit state machine still allows characters to
be transmitted when written to the UART write FIFO, simply disable the
transmit interrupt when the UART port is stopped.

This has not shown an improvement with the console issues when running
systemd, but seems like it should be done.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Reported-by: Edward Cragg <ed.cragg@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 14:41:15 +00:00 committed by Greg Kroah-Hartman
parent 41788f0549
commit 855ddcab35
1 changed files with 2 additions and 2 deletions
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4
drivers/tty/serial/meson_uart.c
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@ -110,7 +110,7 @@ static void meson_uart_stop_tx(struct uart_port *port)
u32 val;
val = readl(port->membase + AML_UART_CONTROL);
val &= ~AML_UART_TX_EN;
val &= ~AML_UART_TX_INT_EN;
writel(val, port->membase + AML_UART_CONTROL);
}
@ -133,7 +133,7 @@ static void meson_uart_shutdown(struct uart_port *port)
spin_lock_irqsave(&port->lock, flags);
val = readl(port->membase + AML_UART_CONTROL);
val &= ~(AML_UART_RX_EN | AML_UART_TX_EN);
val &= ~AML_UART_RX_EN;
val &= ~(AML_UART_RX_INT_EN | AML_UART_TX_INT_EN);
writel(val, port->membase + AML_UART_CONTROL);