Re: [PATCH] net/ethernet/jme: disable ASPM

Le Mon, 08 Oct 2012 15:39:53 -0400 (EDT),
David Miller [off-list ref] a écrit :

From: Matthew Garrett <mjg59@srcf.ucam.org>
Date: Mon, 8 Oct 2012 20:33:16 +0100

quoted

On Mon, Oct 08, 2012 at 03:24:26PM -0400, David Miller wrote:

quoted

This should be a PCI quirk shouldn't it?

No, it's a driver-level policy decision.

Then at a bare minimum this change should be using one of the ASPM
helpers provided by drivers/pci/pcie/aspm.c such as
pci_disable_link_state().

pci_disable_link_state() is already used in this patch.
Am I missing something else?

Below you will find updated patch with corrected indentation.

-- >8 --
Subject: [PATCH] net/ethernet/jme: disable ASPM

Based on patch from Matthew Garrett [off-list ref] (https://lkml.org/lkml/2011/11/11/168).

http://driveragent.com/archive/30421/7-0-14 indicates that ASPM is
disabled on the 250 and 260. Duplicate for sanity.

Fixes random RX engine hangs I experienced with JMC250 on Clevo W270HU.

Signed-off-by: Kevin Baradon <redacted>
Cc: Guo-Fu Tseng <cooldavid@cooldavid.org>
Cc: Matthew Garrett <redacted>
Cc: netdev@vger.kernel.org
---
 drivers/net/ethernet/jme.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/jme.c b/drivers/net/ethernet/jme.c
index c911d88..f8064df 100644
--- a/drivers/net/ethernet/jme.c
+++ b/drivers/net/ethernet/jme.c

@@ -27,6 +27,7 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/pci.h>
+#include <linux/pci-aspm.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>

@@ -2973,6 +2974,9 @@ jme_init_one(struct pci_dev *pdev,
 	/*
 	 * set up PCI device basics
 	 */
+	pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1 |
+			       PCIE_LINK_STATE_CLKPM);
+
 	rc = pci_enable_device(pdev);
 	if (rc) {
 		pr_err("Cannot enable PCI device\n");

-- 
1.7.10.4