linux-kernel - [PATCH 3.2 033/107] PCI: Fix TI816X class code quirk

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Message-ID: <lsq.1444349547.470321639@decadent.org.uk>
Date:	Fri, 09 Oct 2015 01:12:27 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Hemant Pedanekar" <hemantp@...com>,
	"Bjorn Helgaas" <bhelgaas@...gle.com>
Subject: [PATCH 3.2 033/107] PCI: Fix TI816X class code quirk

3.2.72-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Bjorn Helgaas <bhelgaas@...gle.com>

commit d1541dc977d376406f4584d8eb055488655c98ec upstream.

In fixup_ti816x_class(), we assigned "class = PCI_CLASS_MULTIMEDIA_VIDEO".
But PCI_CLASS_MULTIMEDIA_VIDEO is only the two-byte base class/sub-class
and needs to be shifted to make space for the low-order interface byte.

Shift PCI_CLASS_MULTIMEDIA_VIDEO to set the correct class code.

Fixes: 63c4408074cb ("PCI: Add quirk for setting valid class for TI816X Endpoint")
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
CC: Hemant Pedanekar <hemantp@...com>
[bwh: Backported to 3.2: the class check is done in this function as there
 is no DECLARE_PCI_FIXUP_CLASS_EARLY()]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/pci/quirks.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2875,8 +2875,9 @@ static void __devinit fixup_ti816x_class
 {
 	/* TI 816x devices do not have class code set when in PCIe boot mode */
 	if (dev->class == PCI_CLASS_NOT_DEFINED) {
-		dev_info(&dev->dev, "Setting PCI class for 816x PCIe device\n");
-		dev->class = PCI_CLASS_MULTIMEDIA_VIDEO;
+		dev->class = PCI_CLASS_MULTIMEDIA_VIDEO << 8;
+		dev_info(&dev->dev, "PCI class overridden (%#08x -> %#08x)\n",
+			 PCI_CLASS_NOT_DEFINED, dev->class);
 	}
 }
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_TI, 0xb800, fixup_ti816x_class);

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