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-rw-r--r--target/linux/mediatek/patches-5.4/1010-pcie-mediatek-fix-clearing-interrupt-status.patch24
1 files changed, 24 insertions, 0 deletions
diff --git a/target/linux/mediatek/patches-5.4/1010-pcie-mediatek-fix-clearing-interrupt-status.patch b/target/linux/mediatek/patches-5.4/1010-pcie-mediatek-fix-clearing-interrupt-status.patch
new file mode 100644
index 0000000000..d3ef78dc72
--- /dev/null
+++ b/target/linux/mediatek/patches-5.4/1010-pcie-mediatek-fix-clearing-interrupt-status.patch
@@ -0,0 +1,24 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Fri, 4 Sep 2020 18:33:27 +0200
+Subject: [PATCH] pcie-mediatek: fix clearing interrupt status
+
+Clearing the status needs to happen after running the handler, otherwise
+we will get an extra spurious interrupt after the cause has been cleared
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/drivers/pci/controller/pcie-mediatek.c
++++ b/drivers/pci/controller/pcie-mediatek.c
+@@ -616,10 +616,10 @@ static void mtk_pcie_intr_handler(struct
+ if (status & INTX_MASK) {
+ for_each_set_bit_from(bit, &status, PCI_NUM_INTX + INTX_SHIFT) {
+ /* Clear the INTx */
+- writel(1 << bit, port->base + PCIE_INT_STATUS);
+ virq = irq_find_mapping(port->irq_domain,
+ bit - INTX_SHIFT);
+ generic_handle_irq(virq);
++ writel(1 << bit, port->base + PCIE_INT_STATUS);
+ }
+ }
+