PCI: designware: Check for iATU unroll only on platforms that use ATU

Port of a Linux commit a782b5f986c3fa1cfa7f2b57941200c6a5809242

  Previously we checked for iATU unroll support by reading PCIE_ATU_VIEWPORT
  even on platforms, e.g., Keystone, that do not have ATU ports.  This can
  cause bad behavior such as asynchronous external aborts:

    OF: PCI:   MEM 0x60000000..0x6fffffff -> 0x60000000
    Unhandled fault: asynchronous external abort (0x1211) at 0x00000000
    pgd = c0003000
    [00000000] *pgd=80000800004003, *pmd=00000000
    Internal error: : 1211 [#1] PREEMPT SMP ARM
    Modules linked in:
    CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.9.0-00009-g6ff59d2-dirty #7
    Hardware name: Keystone
    task: eb878000 task.stack: eb866000
    PC is at dw_pcie_setup_rc+0x24/0x380
    LR is at ks_pcie_host_init+0x10/0x170

  Move the dw_pcie_iatu_unroll_enabled() check so we only call it on
  platforms that do not use the ATU.  These platforms supply their own
  ->rd_other_conf() and ->wr_other_conf() methods.

  [bhelgaas: changelog]
  Fixes: a0601a470537 ("PCI: designware: Add iATU Unroll feature")
  Fixes: 416379f9ebde ("PCI: designware: Check for iATU unroll support after initializing host")
  Tested-by: Kishon Vijay Abraham I <kishon@ti.com>
  Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
  Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
  Acked-By: Joao Pinto <jpinto@synopsys.com>
  CC: stable@vger.kernel.org      # v4.9+

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

0 files changed, 0 insertions, 0 deletions