linux-kernel - [PATCH 05/93] PCI: Allow pcie_aspm=force even when FADT indicates it is unsupported

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Message-Id: <1360102042-10732-6-git-send-email-herton.krzesinski@canonical.com>
Date:	Tue,  5 Feb 2013 20:05:54 -0200
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Colin Ian King <colin.king@...onical.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Subject: [PATCH 05/93] PCI: Allow pcie_aspm=force even when FADT indicates it is unsupported

3.5.7.5 -stable review patch.  If anyone has any objections, please let me know.

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

From: Colin Ian King <colin.king@...onical.com>

commit 9e16721498b0c3d3ebfa0b503c63d35c0a4c0642 upstream.

Right now using pcie_aspm=force will not enable ASPM if the FADT indicates
ASPM is unsupported.  However, the semantics of force should probably allow
for this, especially as they did before 3c076351c4 ("PCI: Rework ASPM
disable code")

This patch just skips the clearing of any ASPM setup that the firmware has
carried out on this bus if pcie_aspm=force is being used.

Reference: http://bugs.launchpad.net/bugs/962038
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
---
 drivers/pci/pcie/aspm.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index b500840..474f22f 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -798,6 +798,9 @@ void pcie_clear_aspm(struct pci_bus *bus)
 {
 	struct pci_dev *child;
 
+	if (aspm_force)
+		return;
+
 	/*
 	 * Clear any ASPM setup that the firmware has carried out on this bus
 	 */
-- 
1.7.9.5

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