linux-kernel - [PATCH V3 1/2] PCI: Add Extended Tags quirk for Broadcom HT2100 Root Port

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Date:   Tue, 11 Jul 2017 11:25:33 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     linux-pci@...r.kernel.org, timur@...eaurora.org,
        wim.ten.have@...cle.com
Cc:     linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Sinan Kaya <okaya@...eaurora.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH V3 1/2] PCI: Add Extended Tags quirk for Broadcom HT2100 Root Port

All PCIe devices are expected to be able to handle 8-bit tags.
'commit 60db3a4d8cc9 ("PCI: Enable PCIe Extended Tags if supported")'
enabled extended tags for all devices based on the spec direction.

The Broadcom HT2100 seems to be having issues with handling
8-bit tags. Mark it as broken.

Reported-by: Wim ten Have <wim.ten.have@...cle.com>
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1467674
Fixes: 60db3a4d8cc9 ("PCI: Enable PCIe Extended Tags if supported")
Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
---
 drivers/pci/quirks.c | 12 ++++++++++++
 include/linux/pci.h  |  1 +
 2 files changed, 13 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 085fb78..073d5dd 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -4664,3 +4664,15 @@ static void quirk_intel_no_flr(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x1502, quirk_intel_no_flr);
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x1503, quirk_intel_no_flr);
+
+static void quirk_exttags_completer(struct pci_dev *pdev)
+{
+	/* This device cannot handle 256 tags as a completer */
+	pdev->broken_exttags_completer = 1;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, 0x0140,
+			quirk_exttags_completer);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, 0x0142,
+			quirk_exttags_completer);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, 0x0144,
+			quirk_exttags_completer);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 8039f9f..0b9f42d 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -376,6 +376,7 @@ struct pci_dev {
 	unsigned int	irq_managed:1;
 	unsigned int	has_secondary_link:1;
 	unsigned int	non_compliant_bars:1;	/* broken BARs; ignore them */
+	unsigned int	broken_exttags_completer:1;
 	pci_dev_flags_t dev_flags;
 	atomic_t	enable_cnt;	/* pci_enable_device has been called */
 
-- 
1.9.1