From: Pali Rohár pali@kernel.org

[ Upstream commit 7d8dc1f7cd007a7ce94c5b4c20d63a8b8d6d7751 ]

We already clear all the other interrupts (ISR0, ISR1, HOST_CTRL_INT).

Define a new macro PCIE_MSI_ALL_MASK and do the same clearing for MSIs, to ensure that we don't start receiving spurious interrupts.

Use this new mask in advk_pcie_handle_msi();

Link: https://lore.kernel.org/r/20211130172913.9727-5-kabel@kernel.org Signed-off-by: Pali Rohár pali@kernel.org Signed-off-by: Marek Behún kabel@kernel.org Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Signed-off-by: Marek Behún kabel@kernel.org --- drivers/pci/controller/pci-aardvark.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c index 721d2652319c..d43e93eb2fed 100644 --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -108,6 +108,7 @@ #define PCIE_MSI_ADDR_HIGH_REG (CONTROL_BASE_ADDR + 0x54) #define PCIE_MSI_STATUS_REG (CONTROL_BASE_ADDR + 0x58) #define PCIE_MSI_MASK_REG (CONTROL_BASE_ADDR + 0x5C) +#define PCIE_MSI_ALL_MASK GENMASK(31, 0) #define PCIE_MSI_PAYLOAD_REG (CONTROL_BASE_ADDR + 0x9C) #define PCIE_MSI_DATA_MASK GENMASK(15, 0)

@@ -561,6 +562,7 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie) advk_writel(pcie, reg, PCIE_CORE_CTRL2_REG);

/* Clear all interrupts */ + advk_writel(pcie, PCIE_MSI_ALL_MASK, PCIE_MSI_STATUS_REG); advk_writel(pcie, PCIE_ISR0_ALL_MASK, PCIE_ISR0_REG); advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_REG); advk_writel(pcie, PCIE_IRQ_ALL_MASK, HOST_CTRL_INT_STATUS_REG); @@ -573,7 +575,7 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie) advk_writel(pcie, PCIE_ISR1_ALL_MASK, PCIE_ISR1_MASK_REG);

/* Unmask all MSIs */ - advk_writel(pcie, 0, PCIE_MSI_MASK_REG); + advk_writel(pcie, ~(u32)PCIE_MSI_ALL_MASK, PCIE_MSI_MASK_REG);

/* Enable summary interrupt for GIC SPI source */ reg = PCIE_IRQ_ALL_MASK & (~PCIE_IRQ_ENABLE_INTS_MASK); @@ -1374,7 +1376,7 @@ static void advk_pcie_handle_msi(struct advk_pcie *pcie)

msi_mask = advk_readl(pcie, PCIE_MSI_MASK_REG); msi_val = advk_readl(pcie, PCIE_MSI_STATUS_REG); - msi_status = msi_val & ~msi_mask; + msi_status = msi_val & ((~msi_mask) & PCIE_MSI_ALL_MASK);

for (msi_idx = 0; msi_idx < MSI_IRQ_NUM; msi_idx++) { if (!(BIT(msi_idx) & msi_status))