[PATCH] pcmcia: Add disable_clkrun option

[OGAWA Hirofumi]

Hi,

I received report that transmission of Realtek 8139 doesn't work.  The
cause of this problem was CLKRUN protocols of laptop's TI 12xx CardBus
bridge.

And I remember that this problem had happened on Thinkpad before. In
the case, problem seems solved by similar workaround of sound/oss/cs46xx.c.

This patch adds "disable_clkrun" option as workaround of problem to
yenta_socket.

Please apply.

Signed-off-by: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
---

 drivers/pcmcia/ti113x.h       |   11 ++++++++---
 drivers/pcmcia/yenta_socket.c |    2 ++
 2 files changed, 10 insertions(+), 3 deletions(-)

diff -puN drivers/pcmcia/ti113x.h~pcmcia-clkrun-disable drivers/pcmcia/ti113x.h
--- linux-2.6.10-rc2/drivers/pcmcia/ti113x.h~pcmcia-clkrun-disable	2004-11-21 15:49:44.000000000 +0900
+++ linux-2.6.10-rc2-hirofumi/drivers/pcmcia/ti113x.h	2004-11-21 15:49:44.000000000 +0900
@@ -592,15 +592,20 @@ out:
 
 static int ti12xx_override(struct yenta_socket *socket)
 {
-	u32 val;
+	u32 val, val_orig;
 
 	/* make sure that memory burst is active */
-	val = config_readl(socket, TI113X_SYSTEM_CONTROL);
+	val_orig = val = config_readl(socket, TI113X_SYSTEM_CONTROL);
+	if (disable_clkrun && PCI_FUNC(socket->dev->devfn) == 0) {
+		printk(KERN_INFO "Yenta: Disabling CLKRUN feature\n");
+		val |= TI113X_SCR_KEEPCLK;
+	}
 	if (!(val & TI122X_SCR_MRBURSTUP)) {
 		printk(KERN_INFO "Yenta: Enabling burst memory read transactions\n");
 		val |= TI122X_SCR_MRBURSTUP;
-		config_writel(socket, TI113X_SYSTEM_CONTROL, val);
 	}
+	if (val_orig != val)
+		config_writel(socket, TI113X_SYSTEM_CONTROL, val);
 
 	/*
 	 * for EnE bridges only: clear testbit TLTEnable. this makes the
diff -puN drivers/pcmcia/yenta_socket.c~pcmcia-clkrun-disable drivers/pcmcia/yenta_socket.c
--- linux-2.6.10-rc2/drivers/pcmcia/yenta_socket.c~pcmcia-clkrun-disable	2004-11-21 15:49:44.000000000 +0900
+++ linux-2.6.10-rc2-hirofumi/drivers/pcmcia/yenta_socket.c	2004-11-22 18:56:20.000000000 +0900
@@ -28,6 +28,8 @@
 #include "yenta_socket.h"
 #include "i82365.h"
 
+static int disable_clkrun;
+module_param(disable_clkrun, bool, 0444);
 
 #if 0
 #define debug(x,args...) printk(KERN_DEBUG "%s: " x, __func__ , ##args)
_

-- 
OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
-
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