2 files changed, 15 insertions, 10 deletions

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 30e8beb71430..27cc288e91d0 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -132,9 +132,9 @@ struct uart_8250_port {
         struct uart_port        port;
         struct timer_list       timer;          /* "no irq" timer */
         struct list_head        list;           /* ports on this IRQ */
-        unsigned int            capabilities;   /* port capabilities */
+        unsigned short          capabilities;   /* port capabilities */
+        unsigned short          bugs;           /* port bugs */
         unsigned int            tx_loadsz;      /* transmit fifo load size */
-        unsigned short          rev;
         unsigned char           acr;
         unsigned char           ier;
         unsigned char           lcr;
@@ -560,7 +560,14 @@ static void autoconfig_has_efr(struct uart_8250_port *up)
         if (id1 == 0x16 && id2 == 0xC9 &&
             (id3 == 0x50 || id3 == 0x52 || id3 == 0x54)) {
                 up->port.type = PORT_16C950;
-                up->rev = rev | (id3 << 8);
+
+                /*
+                 * Enable work around for the Oxford Semiconductor 952 rev B
+                 * chip which causes it to seriously miscalculate baud rates
+                 * when DLL is 0.
+                 */
+                if (id3 == 0x52 && rev == 0x01)
+                        up->bugs |= UART_BUG_QUOT;
                 return;
         }
         
@@ -577,8 +584,6 @@ static void autoconfig_has_efr(struct uart_8250_port *up)
 
         id2 = id1 >> 8;
         if (id2 == 0x10 || id2 == 0x12 || id2 == 0x14) {
-                if (id2 == 0x10)
-                        up->rev = id1 & 255;
                 up->port.type = PORT_16850;
                 return;
         }
@@ -809,6 +814,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
 //      save_flags(flags); cli();
 
         up->capabilities = 0;
+        up->bugs = 0;
 
         if (!(up->port.flags & UPF_BUGGY_UART)) {
                 /*
@@ -1677,12 +1683,9 @@ serial8250_set_termios(struct uart_port *port, struct termios *termios,
         quot = serial8250_get_divisor(port, baud);
 
         /*
-         * Work around a bug in the Oxford Semiconductor 952 rev B
-         * chip which causes it to seriously miscalculate baud rates
-         * when DLL is 0.
+         * Oxford Semi 952 rev B workaround
          */
-        if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 &&
-            up->rev == 0x5201)
+        if (up->bugs & UART_BUG_QUOT && (quot & 0xff) == 0)
                 quot ++;
 
         if (up->capabilities & UART_CAP_FIFO && up->port.fifosize > 1) {
diff --git a/drivers/serial/8250.h b/drivers/serial/8250.h
index 4f3d62f222f4..cd5c3dd2d910 100644
--- a/drivers/serial/8250.h
+++ b/drivers/serial/8250.h
@@ -51,6 +51,8 @@ struct serial8250_config {
 #define UART_CAP_AFE    (1 << 11)       /* MCR-based hw flow control */
 #define UART_CAP_UUE    (1 << 12)       /* UART needs IER bit 6 set (Xscale) */
 
+#define UART_BUG_QUOT   (1 << 0)        /* UART has buggy quot LSB */
+
 #if defined(__i386__) && (defined(CONFIG_M386) || defined(CONFIG_M486))
 #define _INLINE_ inline
 #else