target/linux/mediatek/patches-5.4/1010-pcie-mediatek-fix-clearing-interrupt-status.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Fri, 4 Sep 2020 18:33:27 +0200
   3 Subject: [PATCH] pcie-mediatek: fix clearing interrupt status
   4
   5 Clearing the status needs to happen after running the handler, otherwise
   6 we will get an extra spurious interrupt after the cause has been cleared
   7
   8 Signed-off-by: Felix Fietkau <nbd@nbd.name>
   9 ---
  10
  11 --- a/drivers/pci/controller/pcie-mediatek.c
  12 +++ b/drivers/pci/controller/pcie-mediatek.c
  13 @@ -616,10 +616,10 @@ static void mtk_pcie_intr_handler(struct
  14         if (status & INTX_MASK) {
  15                 for_each_set_bit_from(bit, &status, PCI_NUM_INTX + INTX_SHIFT) {
  16                         /* Clear the INTx */
  17 -                       writel(1 << bit, port->base + PCIE_INT_STATUS);
  18                         virq = irq_find_mapping(port->irq_domain,
  19                                                 bit - INTX_SHIFT);
  20                         generic_handle_irq(virq);
  21 +                       writel(1 << bit, port->base + PCIE_INT_STATUS);
  22                 }
  23         }
  24