target/linux/layerscape/patches-5.4/812-pcie-0002-PCI-dwc-Use-interrupt-disabling-instead-of-masking.patch

   1 From c89d85a39df353290ea7af84a32d5ca692a3c27a Mon Sep 17 00:00:00 2001
   2 From: Fugang Duan <fugang.duan@nxp.com>
   3 Date: Sat, 2 Nov 2019 15:51:40 +0800
   4 Subject: [PATCH] PCI: dwc: Use interrupt disabling instead of masking
   5
   6 commit 830920e065e9("PCI: dwc: Use interrupt masking instead
   7 of disabling") break i.MX platform PCIe suspend/resume when
   8 MSI enabled.
   9
  10 Revert the commit to keep orinigal method that using interrupt
  11 disabling instead of masking.
  12
  13 Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
  14 ---
  15  drivers/pci/controller/dwc/pcie-designware-host.c | 19 +++++++------------
  16  1 file changed, 7 insertions(+), 12 deletions(-)
  17
  18 --- a/drivers/pci/controller/dwc/pcie-designware-host.c
  19 +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
  20 @@ -157,8 +157,8 @@ static void dw_pci_bottom_mask(struct ir
  21         bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
  22
  23         pp->irq_mask[ctrl] |= BIT(bit);
  24 -       dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK + res, 4,
  25 -                           pp->irq_mask[ctrl]);
  26 +       dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4,
  27 +                           ~pp->irq_mask[ctrl]);
  28
  29         raw_spin_unlock_irqrestore(&pp->lock, flags);
  30  }
  31 @@ -176,8 +176,8 @@ static void dw_pci_bottom_unmask(struct
  32         bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;
  33
  34         pp->irq_mask[ctrl] &= ~BIT(bit);
  35 -       dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK + res, 4,
  36 -                           pp->irq_mask[ctrl]);
  37 +       dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4,
  38 +                           ~pp->irq_mask[ctrl]);
  39
  40         raw_spin_unlock_irqrestore(&pp->lock, flags);
  41  }
  42 @@ -657,15 +657,10 @@ void dw_pcie_setup_rc(struct pcie_port *
  43                 num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
  44
  45                 /* Initialize IRQ Status array */
  46 -               for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
  47 -                       pp->irq_mask[ctrl] = ~0;
  48 -                       dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK +
  49 +               for (ctrl = 0; ctrl < num_ctrls; ctrl++)
  50 +                       dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE +
  51                                             (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
  52 -                                           4, pp->irq_mask[ctrl]);
  53 -                       dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE +
  54 -                                           (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
  55 -                                           4, ~0);
  56 -               }
  57 +                                           4, &pp->irq_mask[ctrl]);
  58         }
  59
  60         /* Setup RC BARs */