linux-kernel - [41/98] dm9601: fix phy/eeprom write routine

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Message-Id: <20100510223538.105841455@kvm.kroah.org>
Date:	Mon, 10 May 2010 15:34:53 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Peter Korsgaard <jacmet@...site.dk>,
	"David S. Miller" <davem@...emloft.net>
Subject: [41/98] dm9601: fix phy/eeprom write routine

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Peter Korsgaard <jacmet@...site.dk>

commit e9162ab1610531d6ea6c1833daeb2613e44275e8 upstream.

Use correct bit positions in DM_SHARED_CTRL register for writes.

Michael Planes recently encountered a 'KY-RS9600 USB-LAN converter', which
came with a driver CD containing a Linux driver. This driver turns out to
be a copy of dm9601.c with symbols renamed and my copyright stripped.
That aside, it did contain 1 functional change in dm_write_shared_word(),
and after checking the datasheet the original value was indeed wrong
(read versus write bits).

On Michaels HW, this change bumps receive speed from ~30KB/s to ~900KB/s.
On other devices the difference is less spectacular, but still significant
(~30%).

Reported-by: Michael Planes <michael.planes@...e.fr>
Signed-off-by: Peter Korsgaard <jacmet@...site.dk>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/usb/dm9601.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/usb/dm9601.c
+++ b/drivers/net/usb/dm9601.c
@@ -238,7 +238,7 @@ static int dm_write_shared_word(struct u
 		goto out;

 	dm_write_reg(dev, DM_SHARED_ADDR, phy ? (reg | 0x40) : reg);
-	dm_write_reg(dev, DM_SHARED_CTRL, phy ? 0x1c : 0x14);
+	dm_write_reg(dev, DM_SHARED_CTRL, phy ? 0x1a : 0x12);

 	for (i = 0; i < DM_TIMEOUT; i++) {
 		u8 tmp;

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