linux-kernel - [143/146] PCI: Add quirk for setting valid class for TI816X Endpoint

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Date:	Wed, 01 Jun 2011 17:01:19 +0900
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Hemant Pedanekar <hemantp@...com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [143/146] PCI: Add quirk for setting valid class for TI816X Endpoint

2.6.38-stable review patch.  If anyone has any objections, please let us know.

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

From: Hemant Pedanekar <hemantp@...com>

commit 63c4408074cbcc070ac17fc10e524800eb9bd0b0 upstream.

TI816X (common name for DM816x/C6A816x/AM389x family) devices configured
to boot as PCIe Endpoint have class code = 0. This makes kernel PCI bus
code to skip allocating BARs to these devices resulting into following
type of error when trying to enable them:

"Device 0000:01:00.0 not available because of resource collisions"

The device cannot be operated because of the above issue.

This patch adds a ID specific (TI VENDOR ID and 816X DEVICE ID based)
'early' fixup quirk to replace class code with
PCI_CLASS_MULTIMEDIA_VIDEO as class.

Signed-off-by: Hemant Pedanekar <hemantp@...com>
Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/pci/quirks.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2784,6 +2784,16 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_IN
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x3c28, vtd_mask_spec_errors);
 #endif
 
+static void __devinit fixup_ti816x_class(struct pci_dev* dev)
+{
+	/* 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;
+	}
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_TI, 0xb800, fixup_ti816x_class);
+
 static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f,
 			  struct pci_fixup *end)
 {


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