netdev - [RFC Patch] 405gp IBM EMAC Phy probe fails with no link

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Message-ID: <5073C2E7.4050903@acmay.org>
Date:	Mon, 08 Oct 2012 23:23:35 -0700
From:	Andrew May <acmay@...ay.org>
To:	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org
Subject: [RFC Patch] 405gp IBM EMAC Phy probe fails with no link

I have an older PPC 405GP board with a 2.6.33 kernel that fails to 
install a eth0 instance because the phy probe fails when there is no 
good ethernet link.
I have looked at the latest kernel code and it seems just about the same 
in this area, but I have not tried it.

Does anyone else still have a 405GP board to try and see if eth0 comes 
up with not enet cable?

I tried to probe the phy earlier and skip the emac_configure() call in 
emac_init_phy() to avoid doing the MR0_SRST bit set.
But the phy read still times out.

I then went with this approach to re-call emac_init_phy() after the 
emac_reset() finally completes when a cable is plugged in.
Does anyone else have any ideas why the phy probe fails on the first pass?

View attachment "ibm_phyprobe.patch" of type "text/x-patch" (2451 bytes)