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authorRussell King <rmk+kernel@arm.linux.org.uk>2010-12-22 20:13:05 +0300
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-01-05 19:58:45 +0300
commitffca2b114c6a804d1307781df687e877a373a1c2 (patch)
tree976cffca5c682bcec045ab9f52456854474930a3 /drivers/serial
parentc19f12b5ef3adf3c139eabbe3d3d0201838b77b1 (diff)
downloadlinux-ffca2b114c6a804d1307781df687e877a373a1c2.tar.xz
ARM: PL011: Separate hardware FIFO size from TTY FIFO size
With DMA support, we need to tell the TTY subsystem that the DMA buffer is the size of the FIFO, otherwise things like tty_wait_until_sent() will time out too early. Keep (and use) the hardware value separately from the port->fifosize. This was part of a larger patch from Linus Walleij, with a little modification. Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/amba-pl011.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index 6afdd9b39720..f9b6b8213e77 100644
--- a/drivers/serial/amba-pl011.c
+++ b/drivers/serial/amba-pl011.c
@@ -97,6 +97,7 @@ struct uart_amba_port {
const struct vendor_data *vendor;
unsigned int im; /* interrupt mask */
unsigned int old_status;
+ unsigned int fifosize; /* vendor-specific */
unsigned int lcrh_tx; /* vendor-specific */
unsigned int lcrh_rx; /* vendor-specific */
bool autorts;
@@ -203,7 +204,7 @@ static void pl011_tx_chars(struct uart_amba_port *uap)
return;
}
- count = uap->port.fifosize >> 1;
+ count = uap->fifosize >> 1;
do {
writew(xmit->buf[xmit->tail], uap->port.membase + UART01x_DR);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
@@ -541,7 +542,7 @@ pl011_set_termios(struct uart_port *port, struct ktermios *termios,
if (!(termios->c_cflag & PARODD))
lcr_h |= UART01x_LCRH_EPS;
}
- if (port->fifosize > 1)
+ if (uap->fifosize > 1)
lcr_h |= UART01x_LCRH_FEN;
spin_lock_irqsave(&port->lock, flags);
@@ -871,12 +872,13 @@ static int pl011_probe(struct amba_device *dev, struct amba_id *id)
uap->vendor = vendor;
uap->lcrh_rx = vendor->lcrh_rx;
uap->lcrh_tx = vendor->lcrh_tx;
+ uap->fifosize = vendor->fifosize;
uap->port.dev = &dev->dev;
uap->port.mapbase = dev->res.start;
uap->port.membase = base;
uap->port.iotype = UPIO_MEM;
uap->port.irq = dev->irq[0];
- uap->port.fifosize = vendor->fifosize;
+ uap->port.fifosize = uap->fifosize;
uap->port.ops = &amba_pl011_pops;
uap->port.flags = UPF_BOOT_AUTOCONF;
uap->port.line = i;