releases/4.9.130/pci-aardvark-size-bridges-before-resources-allocation.patch

   1 From 91a2968e245d6ba616db37001fa1a043078b1a65 Mon Sep 17 00:00:00 2001
   2 From: Zachary Zhang <zhangzg@marvell.com>
   3 Date: Fri, 29 Jun 2018 11:16:19 +0200
   4 Subject: PCI: aardvark: Size bridges before resources allocation
   5
   6 From: Zachary Zhang <zhangzg@marvell.com>
   7
   8 commit 91a2968e245d6ba616db37001fa1a043078b1a65 upstream.
   9
  10 The PCIE I/O and MEM resource allocation mechanism is that root bus
  11 goes through the following steps:
  12
  13 1. Check PCI bridges' range and computes I/O and Mem base/limits.
  14
  15 2. Sort all subordinate devices I/O and MEM resource requirements and
  16    allocate the resources and writes/updates subordinate devices'
  17    requirements to PCI bridges I/O and Mem MEM/limits registers.
  18
  19 Currently, PCI Aardvark driver only handles the second step and lacks
  20 the first step, so there is an I/O and MEM resource allocation failure
  21 when using a PCI switch. This commit fixes that by sizing bridges
  22 before doing the resource allocation.
  23
  24 Fixes: 8c39d710363c1 ("PCI: aardvark: Add Aardvark PCI host controller
  25 driver")
  26 Signed-off-by: Zachary Zhang <zhangzg@marvell.com>
  27 [Thomas: edit commit log.]
  28 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
  29 Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
  30 Cc: <stable@vger.kernel.org>
  31 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  32
  33
  34 ---
  35  drivers/pci/host/pci-aardvark.c |    1 +
  36  1 file changed, 1 insertion(+)
  37
  38 --- a/drivers/pci/host/pci-aardvark.c
  39 +++ b/drivers/pci/host/pci-aardvark.c
  40 @@ -976,6 +976,7 @@ static int advk_pcie_probe(struct platfo
  41                 return -ENOMEM;
  42         }
  43
  44 +       pci_bus_size_bridges(bus);
  45         pci_bus_assign_resources(bus);
  46
  47         list_for_each_entry(child, &bus->children, node)