linux-kernel - [PATCH V1 1/5] PCI: tegra: Fix handling BME

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Date:   Thu, 27 May 2021 13:16:10 +0530
From:   Om Prakash Singh <omp@...dia.com>
To:     <vidyas@...dia.com>, <lorenzo.pieralisi@....com>,
        <bhelgaas@...gle.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>
CC:     <linux-tegra@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, Om Prakash Singh <omp@...dia.com>
Subject: [PATCH V1 1/5] PCI: tegra: Fix handling BME_CHGED event

In tegra_pcie_ep_hard_irq(), APPL_INTR_STATUS_L0 is stored in val and again
APPL_INTR_STATUS_L1_0_0 is also stored in val. So when execution reaches
"if (val & APPL_INTR_STATUS_L0_PCI_CMD_EN_INT)", val is not correct.

Signed-off-by: Om Prakash Singh <omp@...dia.com>
---
 drivers/pci/controller/dwc/pcie-tegra194.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index bafd2c6ab3c2..c51d666c9d87 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -615,10 +615,10 @@ static irqreturn_t tegra_pcie_ep_hard_irq(int irq, void *arg)
 	struct tegra_pcie_dw *pcie = arg;
 	struct dw_pcie_ep *ep = &pcie->pci.ep;
 	int spurious = 1;
-	u32 val, tmp;
+	u32 val_l0, val, tmp;
 
-	val = appl_readl(pcie, APPL_INTR_STATUS_L0);
-	if (val & APPL_INTR_STATUS_L0_LINK_STATE_INT) {
+	val_l0 = appl_readl(pcie, APPL_INTR_STATUS_L0);
+	if (val_l0 & APPL_INTR_STATUS_L0_LINK_STATE_INT) {
 		val = appl_readl(pcie, APPL_INTR_STATUS_L1_0_0);
 		appl_writel(pcie, val, APPL_INTR_STATUS_L1_0_0);
 
@@ -636,7 +636,7 @@ static irqreturn_t tegra_pcie_ep_hard_irq(int irq, void *arg)
 		spurious = 0;
 	}
 
-	if (val & APPL_INTR_STATUS_L0_PCI_CMD_EN_INT) {
+	if (val_l0 & APPL_INTR_STATUS_L0_PCI_CMD_EN_INT) {
 		val = appl_readl(pcie, APPL_INTR_STATUS_L1_15);
 		appl_writel(pcie, val, APPL_INTR_STATUS_L1_15);
 
@@ -648,8 +648,8 @@ static irqreturn_t tegra_pcie_ep_hard_irq(int irq, void *arg)
 
 	if (spurious) {
 		dev_warn(pcie->dev, "Random interrupt (STATUS = 0x%08X)\n",
-			 val);
-		appl_writel(pcie, val, APPL_INTR_STATUS_L0);
+			 val_l0);
+		appl_writel(pcie, val_l0, APPL_INTR_STATUS_L0);
 	}
 
 	return IRQ_HANDLED;
-- 
2.17.1