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mediatek: fix an irq handling issue 

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2020-09-04 19:41:33 +02:00
parent 7081b1704e
commit 44fe9e6f84
1 changed files with 24 additions and 0 deletions
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target/linux/mediatek/patches-5.4/1010-pcie-mediatek-fix-clearing-interrupt-status.patch Normal file
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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);
}
}