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| author | Jeff Garzik <jeff@garzik.org> | 2007-02-17 15:09:59 -0500 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-02-17 15:09:59 -0500 |
| commit | 48c871c1f6a7c7044dd76774fb469e65c7e2e4e8 (patch) | |
| tree | da3aa535c98cc0957851354ceb0fbff7482d7a9d /drivers/serial/8250.c | |
| parent | 1a1689344add3333d28d1b5495d8043a3877d01c (diff) | |
| parent | 4409d28140d9a6e6e3f4f1fdaf7234c4b965d954 (diff) | |
Merge branch 'gfar' of master.kernel.org:/pub/scm/linux/kernel/git/galak/powerpc into upstream
Diffstat (limited to 'drivers/serial/8250.c')
| -rw-r--r-- | drivers/serial/8250.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c index 5261f0af8b1..2964ca9df5a 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) { /* |