diff options
| author | Kumar Gala <galak@kernel.crashing.org> | 2007-02-12 23:57:21 -0600 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2007-02-12 23:57:21 -0600 |
| commit | 54c66f6d781e03dc0b23956234963c4911e6d1c0 (patch) | |
| tree | 40619a66ae6d8703a57bf681d087ffeabbffd346 /drivers/serial/8250.c | |
| parent | 8ce0a7df6e6117d8814e976d4b7ce6a6b2c9cf93 (diff) | |
| parent | 17e0e27020d028a790d97699aff85a43af5be472 (diff) | |
Merge branch 'master' into 85xx
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) { /* |