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authorWolfram Sang <w.sang@pengutronix.de>2010-01-10 09:41:24 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2010-02-17 17:37:35 +0100
commit35169529093be3bbef70afd3c4125e35cece7e03 (patch)
tree2cb4f4df0799f4e23d475d284d63a4941b844679 /drivers
parent63c9a8b3023e6e276343da56e0f31a98c28ece9b (diff)
downloadlinux-35169529093be3bbef70afd3c4125e35cece7e03.tar.bz2
pcmcia/yenta: add module parameter for O2 speedups
O2-bridges can do read prefetch and write burst. However, for some combinations of older bridges and cards, this causes problems, so it is disabled for those bridges. Now, as some users know their setup works with the speedups enabled, a new parameter is introduced to the driver. Now, a user can specifically enable or disable these features, while the default is what we have today: detect the bridge and decide accordingly. Fixes Bugzilla entry 15014. Simplify and unify the printouts, fix a whitespace issue while we are here. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Tested-by: frodone@gmail.com [linux@dominikbrodowski.net: whitespace fixes] Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pcmcia/o2micro.h45
-rw-r--r--drivers/pcmcia/yenta_socket.c5
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.. */