From 9c4ef4b0301673c6fa48b5ad138b6ce94e34c841 Mon Sep 17 00:00:00 2001 From: Andre Przywara Date: Thu, 21 May 2015 17:26:20 +0100 Subject: [PATCH] drivers: PL011: move cts_event workaround into separate function To avoid lines with more than 80 characters and to make the pl011_int() function more readable, move the workaround out into a separate function. Signed-off-by: Andre Przywara Tested-by: Mark Langsdorf Tested-by: Naresh Bhat Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/amba-pl011.c | 33 ++++++++++++++++++++------------- 1 file changed, 20 insertions(+), 13 deletions(-) diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index b66636bf06a0..7ecf3b380132 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -1317,6 +1317,25 @@ static void pl011_modem_status(struct uart_amba_port *uap) wake_up_interruptible(&uap->port.state->port.delta_msr_wait); } +static void check_apply_cts_event_workaround(struct uart_amba_port *uap) +{ + unsigned int dummy_read; + + if (!uap->vendor->cts_event_workaround) + return; + + /* workaround to make sure that all bits are unlocked.. */ + writew(0x00, uap->port.membase + UART011_ICR); + + /* + * WA: introduce 26ns(1 uart clk) delay before W1C; + * single apb access will incur 2 pclk(133.12Mhz) delay, + * so add 2 dummy reads + */ + dummy_read = readw(uap->port.membase + UART011_ICR); + dummy_read = readw(uap->port.membase + UART011_ICR); +} + static irqreturn_t pl011_int(int irq, void *dev_id) { struct uart_amba_port *uap = dev_id; @@ -1324,25 +1343,13 @@ static irqreturn_t pl011_int(int irq, void *dev_id) unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT; u16 imsc; int handled = 0; - unsigned int dummy_read; spin_lock_irqsave(&uap->port.lock, flags); imsc = readw(uap->port.membase + UART011_IMSC); status = readw(uap->port.membase + UART011_RIS) & imsc; if (status) { do { - if (uap->vendor->cts_event_workaround) { - /* workaround to make sure that all bits are unlocked.. */ - writew(0x00, uap->port.membase + UART011_ICR); - - /* - * WA: introduce 26ns(1 uart clk) delay before W1C; - * single apb access will incur 2 pclk(133.12Mhz) delay, - * so add 2 dummy reads - */ - dummy_read = readw(uap->port.membase + UART011_ICR); - dummy_read = readw(uap->port.membase + UART011_ICR); - } + check_apply_cts_event_workaround(uap); writew(status & ~(UART011_TXIS|UART011_RTIS| UART011_RXIS), -- 2.20.1