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| author | Andre Przywara <andre.przywara@arm.com> | 2015-05-21 17:26:19 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-24 13:08:51 -0700 |
| commit | 075167ed71b7bd9fdeaa5c2f69179471d17e3712 (patch) | |
| tree | a4a14d25cdbbec21764c822c7a9fc73774ee78e3 | |
| parent | 3873e2d7f63a9da3098b28c405d13f15667a01b0 (diff) | |
| download | op-kernel-dev-075167ed71b7bd9fdeaa5c2f69179471d17e3712.zip op-kernel-dev-075167ed71b7bd9fdeaa5c2f69179471d17e3712.tar.gz | |
drivers: PL011: replace UART_MIS reading with _RIS & _IMSC
The PL011 register UART_MIS is actually a bitwise AND of the
UART_RIS and the UART_MISC register.
Since the SBSA UART does not include the _MIS register, use the
two separate registers to get the same behaviour. Since we are
inside the spinlock and we read the _IMSC register only once, there
should be no race issue.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Tested-by: Mark Langsdorf <mlangsdo@redhat.com>
Tested-by: Naresh Bhat <nbhat@cavium.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/amba-pl011.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 38d2245..b66636b 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -1322,11 +1322,13 @@ static irqreturn_t pl011_int(int irq, void *dev_id) struct uart_amba_port *uap = dev_id; unsigned long flags; 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); - status = readw(uap->port.membase + UART011_MIS); + imsc = readw(uap->port.membase + UART011_IMSC); + status = readw(uap->port.membase + UART011_RIS) & imsc; if (status) { do { if (uap->vendor->cts_event_workaround) { @@ -1361,7 +1363,7 @@ static irqreturn_t pl011_int(int irq, void *dev_id) if (pass_counter-- == 0) break; - status = readw(uap->port.membase + UART011_MIS); + status = readw(uap->port.membase + UART011_RIS) & imsc; } while (status != 0); handled = 1; } |
