2 files changed, 34 insertions, 16 deletions

diff --git a/drivers/pcmcia/o2micro.h b/drivers/pcmcia/o2micro.h
index 624442fc0d35..e74bebac2695 100644
--- a/drivers/pcmcia/o2micro.h
+++ b/drivers/pcmcia/o2micro.h
@@ -116,13 +116,12 @@ static int o2micro_override(struct yenta_socket *socket)
          * from Eric Still, 02Micro.
          */
         u8 a, b;
+        bool use_speedup;
 
         if (PCI_FUNC(socket->dev->devfn) == 0) {
                 a = config_readb(socket, O2_RESERVED1);
                 b = config_readb(socket, O2_RESERVED2);
-
-                dev_printk(KERN_INFO, &socket->dev->dev,
-                           "O2: res at 0x94/0xD4: %02x/%02x\n", a, b);
+                dev_dbg(&socket->dev->dev, "O2: 0x94/0xD4: %02x/%02x\n", a, b);
 
                 switch (socket->dev->device) {
                 /*
@@ -135,23 +134,37 @@ static int o2micro_override(struct yenta_socket *socket)
                 case PCI_DEVICE_ID_O2_6812:
                 case PCI_DEVICE_ID_O2_6832:
                 case PCI_DEVICE_ID_O2_6836:
-                case PCI_DEVICE_ID_O2_6933:
-                        dev_printk(KERN_INFO, &socket->dev->dev,
-                                   "Yenta O2: old bridge, disabling read "
-                                   "prefetch/write burst\n");
-                        config_writeb(socket, O2_RESERVED1,
-                                      a & ~(O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST));
-                        config_writeb(socket, O2_RESERVED2,
-                                      b & ~(O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST));
+                case PCI_DEVICE_ID_O2_6933:
+                        use_speedup = false;
                         break;
-
                 default:
-                        dev_printk(KERN_INFO , &socket->dev->dev,
-                                   "O2: enabling read prefetch/write burst\n");
+                        use_speedup = true;
+                        break;
+                }
+
+                /* the user may override our decision */
+                if (strcasecmp(o2_speedup, "on") == 0)
+                        use_speedup = true;
+                else if (strcasecmp(o2_speedup, "off") == 0)
+                        use_speedup = false;
+                else if (strcasecmp(o2_speedup, "default") != 0)
+                        dev_warn(&socket->dev->dev,
+                                "O2: Unknown parameter, using 'default'");
+
+                if (use_speedup) {
+                        dev_info(&socket->dev->dev,
+                                "O2: enabling read prefetch/write burst\n");
+                        config_writeb(socket, O2_RESERVED1,
+                                      a | O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST);
+                        config_writeb(socket, O2_RESERVED2,
+                                      b | O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST);
+                } else {
+                        dev_info(&socket->dev->dev,
+                                "O2: disabling read prefetch/write burst\n");
                         config_writeb(socket, O2_RESERVED1,
-                                      a | O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST);
+                                      a & ~(O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST));
                         config_writeb(socket, O2_RESERVED2,
-                                      b | O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST);
+                                      b & ~(O2_RES_READ_PREFETCH | O2_RES_WRITE_BURST));
                 }
         }
 
diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index e4d12acdd525..041a75a7e55e 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -37,6 +37,11 @@ static int pwr_irqs_off;
 module_param(pwr_irqs_off, bool, 0644);
 MODULE_PARM_DESC(pwr_irqs_off, "Force IRQs off during power-on of slot. Use only when seeing IRQ storms!");
 
+static char o2_speedup[] = "default";
+module_param_string(o2_speedup, o2_speedup, sizeof(o2_speedup), 0444);
+MODULE_PARM_DESC(o2_speedup, "Use prefetch/burst for O2-bridges: 'on', 'off' "
+        "or 'default' (uses recommended behaviour for the detected bridge)");
+
 #define debug(x, s, args...) dev_dbg(&s->dev->dev, x, ##args)
 
 /* Don't ask.. */