target/linux/layerscape/patches-5.4/812-pcie-0003-PCI-dwc-fix-the-msi-failure-after-pm-operations.patch

   1 From f5db8274c8d6c86812fd2036ae49153d3ade3eaa Mon Sep 17 00:00:00 2001
   2 From: richard zhu <hongxing.zhu@nxp.com>
   3 Date: Wed, 6 Nov 2019 15:11:36 +0800
   4 Subject: [PATCH] PCI: dwc: fix the msi failure after pm operations
   5
   6 The controller may be powered off (Link is in L3) during the suspend
   7 mode. The MSI_ADDR would be missed after resume and MSI function
   8 would be failed.
   9 Re-store MSI_ADDR to fix the MSI failure after PM operations.
  10
  11 Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
  12 Acked-by: Fugang Duan <fugang.duan@nxp.com>
  13 Acked-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
  14 ---
  15  drivers/pci/controller/dwc/pcie-designware-host.c | 6 ++++++
  16  1 file changed, 6 insertions(+)
  17
  18 --- a/drivers/pci/controller/dwc/pcie-designware-host.c
  19 +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
  20 @@ -656,6 +656,12 @@ void dw_pcie_setup_rc(struct pcie_port *
  21         dw_pcie_setup(pci);
  22
  23         if (!pp->ops->msi_host_init) {
  24 +               /* Program the msi_data */
  25 +               dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
  26 +                                   lower_32_bits((u64)pp->msi_data));
  27 +               dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
  28 +                                   upper_32_bits((u64)pp->msi_data));
  29 +
  30                 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
  31
  32                 /* Initialize IRQ Status array */