linux-kernel - [BUG] sky2 wol broken for Marvell 88E8053 rev 19

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Message-ID: <4EB150D3.8040009@t-online.de>
Date:	Wed, 02 Nov 2011 15:16:51 +0100
From:	Knut Petersen <Knut_Petersen@...nline.de>
To:	shemminger@...ux-foundation.org
CC:	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: [BUG] sky2 wol broken for Marvell 88E8053 rev 19

WOL is broken on an AOpen i915GMm-hfs mobo with kernel 3.1.

lspci
===
02:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8053 PCI-E Gigabit Ethernet Controller (rev 19)
         Subsystem: AOPEN Inc. Marvell 88E8053 Gigabit Ethernet Controller (Aopen)
         Flags: bus master, fast devsel, latency 0, IRQ 44
         Memory at d0020000 (64-bit, non-prefetchable) [size=16K]
         I/O ports at c000 [size=256]
         [virtual] Expansion ROM at 80900000 [disabled] [size=128K]
         Capabilities: [48] Power Management version 2
         Capabilities: [50] Vital Product Data
         Capabilities: [5c] MSI: Enable+ Count=1/2 Maskable- 64bit+
         Capabilities: [e0] Express Legacy Endpoint, MSI 00
         Capabilities: [100] Advanced Error Reporting
         Kernel driver in use: sky2

03:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8053 PCI-E Gigabit Ethernet Controller (rev 19)
         Subsystem: AOPEN Inc. Marvell 88E8053 Gigabit Ethernet Controller (Aopen)
         Flags: bus master, fast devsel, latency 0, IRQ 45
         Memory at d0120000 (64-bit, non-prefetchable) [size=16K]
         I/O ports at d000 [size=256]
         [virtual] Expansion ROM at 80600000 [disabled] [size=128K]
         Capabilities: [48] Power Management version 2
         Capabilities: [50] Vital Product Data
         Capabilities: [5c] MSI: Enable+ Count=1/2 Maskable- 64bit+
         Capabilities: [e0] Express Legacy Endpoint, MSI 00
         Capabilities: [100] Advanced Error Reporting
         Kernel driver in use: sky2

  fix:
==

WOL does work with the following two changes:

diff original/drivers/net/sky2.c new/drivers/net/sky2.c
826a827
 >       u32 reg1;
878a880,884
 >
 >       /* Turn on legacy PCI-Express PME mode */
 >       reg1 = sky2_pci_read32(hw, PCI_DEV_REG1);
 >       reg1 |= PCI_Y2_PME_LEGACY;
 >       sky2_pci_write32(hw, PCI_DEV_REG1, reg1);

diff original/drivers/net/sky2.h new/drivers/net/sky2.h
374,375c374,375
<       Y2_HW_WOL_ON    = 1<<15,/* HW WOL On  (Yukon-EC Ultra A1 only) */
<       Y2_HW_WOL_OFF   = 1<<14,/* HW WOL On  (Yukon-EC Ultra A1 only) */
---
 >       Y2_HW_WOL_OFF   = 1<<15,/* HW WOL On  (Yukon-EC Ultra A1 only) */
 >       Y2_HW_WOL_ON    = 1<<14,/* HW WOL On  (Yukon-EC Ultra A1 only) */

The first change reverts commit 87b09f1f25cd1e01d7c50bf423c7fe33027d7511,
both changes are based on suggestions found in the www.

WOL only works here if I apply both of them.

Some authors suggest fix 1, some suggested fix 2, I found no msg requesting to
apply both. Several bugzilla references are still unreachable ;-(


So the big question is:
=================

Do those changes fix one system but break other systems?

cu,
  Knut
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