Merge tag 'pci-v4.9-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI fixes from Bjorn Helgaas:
 "PCI fixes:

   - Fix Read Completion Boundary setting, which fixes a boot failure on
     IBM x3850 with Mellanox MT27500 ConnectX-3

   - Update some MAINTAINERS entries and email addresses"

* tag 'pci-v4.9-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: Set Read Completion Boundary to 128 iff Root Port supports it (_HPX)
  PCI: Export pcie_find_root_port
  PCI: designware-plat: Update author email
  PCI: designware: Change maintainer to Joao Pinto
  MAINTAINERS: Add devicetree binding to PCI i.MX6 entry
  MAINTAINERS: Update Richard Zhu's email address

3 files changed, 28 insertions, 16 deletions

diff --git a/drivers/pci/host/pcie-designware-plat.c b/drivers/pci/host/pcie-designware-plat.c
index 8df6312ed300..1a02038c4640 100644
--- a/drivers/pci/host/pcie-designware-plat.c
+++ b/drivers/pci/host/pcie-designware-plat.c
@@ -3,7 +3,7 @@
  *
  * Copyright (C) 2015-2016 Synopsys, Inc. (www.synopsys.com)
  *
- * Authors: Joao Pinto <jpmpinto@gmail.com>
+ * Authors: Joao Pinto <Joao.Pinto@synopsys.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
diff --git a/drivers/pci/pcie/aer/aer_inject.c b/drivers/pci/pcie/aer/aer_inject.c
index db553dc22c8e..2b6a59266689 100644
--- a/drivers/pci/pcie/aer/aer_inject.c
+++ b/drivers/pci/pcie/aer/aer_inject.c
@@ -307,20 +307,6 @@ out:
         return 0;
 }
 
-static struct pci_dev *pcie_find_root_port(struct pci_dev *dev)
-{
-        while (1) {
-                if (!pci_is_pcie(dev))
-                        break;
-                if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT)
-                        return dev;
-                if (!dev->bus->self)
-                        break;
-                dev = dev->bus->self;
-        }
-        return NULL;
-}
-
 static int find_aer_device_iter(struct device *device, void *data)
 {
         struct pcie_device **result = data;
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index ab002671fa60..104c46d53121 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1439,6 +1439,21 @@ static void program_hpp_type1(struct pci_dev *dev, struct hpp_type1 *hpp)
                 dev_warn(&dev->dev, "PCI-X settings not supported\n");
 }
 
+static bool pcie_root_rcb_set(struct pci_dev *dev)
+{
+        struct pci_dev *rp = pcie_find_root_port(dev);
+        u16 lnkctl;
+
+        if (!rp)
+                return false;
+
+        pcie_capability_read_word(rp, PCI_EXP_LNKCTL, &lnkctl);
+        if (lnkctl & PCI_EXP_LNKCTL_RCB)
+                return true;
+
+        return false;
+}
+
 static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
 {
         int pos;
@@ -1468,9 +1483,20 @@ static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
                         ~hpp->pci_exp_devctl_and, hpp->pci_exp_devctl_or);
 
         /* Initialize Link Control Register */
-        if (pcie_cap_has_lnkctl(dev))
+        if (pcie_cap_has_lnkctl(dev)) {
+
+                /*
+                 * If the Root Port supports Read Completion Boundary of
+                 * 128, set RCB to 128.  Otherwise, clear it.
+                 */
+                hpp->pci_exp_lnkctl_and |= PCI_EXP_LNKCTL_RCB;
+                hpp->pci_exp_lnkctl_or &= ~PCI_EXP_LNKCTL_RCB;
+                if (pcie_root_rcb_set(dev))
+                        hpp->pci_exp_lnkctl_or |= PCI_EXP_LNKCTL_RCB;
+
                 pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL,
                         ~hpp->pci_exp_lnkctl_and, hpp->pci_exp_lnkctl_or);
+        }
 
         /* Find Advanced Error Reporting Enhanced Capability */
         pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);