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authorThomas Hoehn <thomas.hoehn@avocent.com>2007-02-10 01:46:05 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 10:51:33 -0800
commit482120084d843d4cbb7ff3eb84510a1471130ce0 (patch)
tree22943ce8e09319530a1acf84a397a7b1f6dbea6f /drivers/serial/8250.c
parenta21217daae8ce6e841e33d4a2bb24026723cb21d (diff)
[PATCH] Perle multimodem card (PCI-RAS) detection
Get the Perle quad-modem PCI card (PCI-RAS4) detected by serial driver. It may also get the PCI-RAS8 running, but can't guarantee as I didn't had one for testing. Signed-off-by: Thomas Hoehn <thomas.hoehn@avocent.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/serial/8250.c')
-rw-r--r--drivers/serial/8250.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 5261f0af8b10..2964ca9df5a0 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -920,12 +920,16 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
#ifdef __i386__
outb(0xff, 0x080);
#endif
- scratch2 = serial_inp(up, UART_IER);
+ /*
+ * Mask out IER[7:4] bits for test as some UARTs (e.g. TL
+ * 16C754B) allow only to modify them if an EFR bit is set.
+ */
+ scratch2 = serial_inp(up, UART_IER) & 0x0f;
serial_outp(up, UART_IER, 0x0F);
#ifdef __i386__
outb(0, 0x080);
#endif
- scratch3 = serial_inp(up, UART_IER);
+ scratch3 = serial_inp(up, UART_IER) & 0x0f;
serial_outp(up, UART_IER, scratch);
if (scratch2 != 0 || scratch3 != 0x0F) {
/*