Subject: [PATCH] phylib: Fix Freescale TBI PHY detection

From: Anton Vorontsov <[email-masked]>
Date: Tue, 13 Jan 2009 19:05:13 +0300

Freescale on-chip TBI PHYs reports PHY ID as 0x0, but as of

commit 3ee82383f0098a2e13acc8cf1be8e47512f41e5a
Author: Giulio Benetti <[email-masked]>
Date:   Thu Nov 13 21:53:13 2008 +0000

    phy: fix phy address bug

    PHYID returns 0xffff and not 0xffffffff when not found and in some
    case(at91sam9263) 0x0. Maybe this patch could be useful.

phy_device.c treats PHY ID == 0x0 as bogus IDs, and that results in
gianfar driver failure to see the TBI PHYs. This code snippet triggers:

	if (!priv->tbiphy) {
		printk(KERN_WARNING "SGMII mode requires that the device "
				"tree specify a tbi-handle\n");
		return;
	}

Although tbi-handle is specified in the device tree.

Btw, technically PHY ID == 0x0 is a valid ID (if we ever see a PHY
manufactured by Xerox :-).

Signed-off-by: Anton Vorontsov <[email-masked]>
---

There is one thing I don't actually understand though...

Andy, were you testing the TBI support on a hardware where PHY ID
!= 0x0 or maybe your TBI PHY support patch (commit b31a1d8b41513b,
dated Tue Dec 16 15:29:15 2008) was based on a bit outdated kernel
version? Because according to the git timestamps, the TBI support
was not working since the submission.

Just in case, the hardware I'm seeing the PHY ID == 0x0 is
MPC8378E-MDS.

Thanks,

 drivers/net/phy/phy_device.c |    9 ---------
 1 files changed, 0 insertions(+), 9 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index e354601..0a06e4f 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -231,15 +231,6 @@ struct phy_device * get_phy_device(struct mii_bus *bus, int addr)
 	if ((phy_id & 0x1fffffff) == 0x1fffffff)
 		return NULL;
 
-	/*
-	 * Broken hardware is sometimes missing the pull-up resistor on the
-	 * MDIO line, which results in reads to non-existent devices returning
-	 * 0 rather than 0xffff. Catch this here and treat 0 as a non-existent
-	 * device as well.
-	 */
-	if (phy_id == 0)
-		return NULL;
-
 	dev = phy_device_create(bus, addr, phy_id);
 
 	return dev;
-- 
1.5.6.5