[PATCHv4 10/28] PCI: mobiveil: fix the INTx process error
From: Z.q. Hou
Date: Mon Mar 11 2019 - 05:31:43 EST
From: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
In the loop block, there is not code change the loop key,
this patch updated the loop key by re-read the INTx status
register.
This patch also change to clear the handled INTx status.
Note: Need MV to test this fix.
Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host
Bridge IP driver")
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
Reviewed-by: Minghuan Lian <Minghuan.Lian@xxxxxxx>
Reviewed-by: Subrahmanya Lingappa <l.subrahmanya@xxxxxxxxxxxxxx>
---
V4:
- no change
drivers/pci/controller/pcie-mobiveil.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/controller/pcie-mobiveil.c b/drivers/pci/controller/pcie-mobiveil.c
index 4ba458474e42..78e575e71f4d 100644
--- a/drivers/pci/controller/pcie-mobiveil.c
+++ b/drivers/pci/controller/pcie-mobiveil.c
@@ -361,6 +361,7 @@ static void mobiveil_pcie_isr(struct irq_desc *desc)
/* Handle INTx */
if (intr_status & PAB_INTP_INTX_MASK) {
shifted_status = csr_readl(pcie, PAB_INTP_AMBA_MISC_STAT);
+ shifted_status &= PAB_INTP_INTX_MASK;
shifted_status >>= PAB_INTX_START;
do {
for_each_set_bit(bit, &shifted_status, PCI_NUM_INTX) {
@@ -372,12 +373,16 @@ static void mobiveil_pcie_isr(struct irq_desc *desc)
dev_err_ratelimited(dev, "unexpected IRQ, INT%d\n",
bit);
- /* clear interrupt */
- csr_writel(pcie,
- shifted_status << PAB_INTX_START,
+ /* clear interrupt handled */
+ csr_writel(pcie, 1 << (PAB_INTX_START + bit),
PAB_INTP_AMBA_MISC_STAT);
}
- } while ((shifted_status >> PAB_INTX_START) != 0);
+
+ shifted_status = csr_readl(pcie,
+ PAB_INTP_AMBA_MISC_STAT);
+ shifted_status &= PAB_INTP_INTX_MASK;
+ shifted_status >>= PAB_INTX_START;
+ } while (shifted_status != 0);
}
/* read extra MSI status register */
--
2.17.1