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PCI: aardvark: Read all 16-bits from PCIE_MSI_PAYLOAD_REG 

The PCIE_MSI_PAYLOAD_REG contains 16-bit MSI number, not only lower
8 bits. Fix reading content of this register and add a comment
describing the access to this register.

Link: https://lore.kernel.org/r/20211028185659.20329-4-kabel@kernel.org
Fixes: 8c39d71036 ("PCI: aardvark: Add Aardvark PCI host controller driver")
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>
Cc: stable@vger.kernel.org
This commit is contained in:
Marek Behún 2021-10-28 20:56:55 +02:00 committed by Lorenzo Pieralisi
parent e4313be159
commit 95997723b6
1 changed files with 6 additions and 1 deletions
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7
drivers/pci/controller/pci-aardvark.c
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@ -119,6 +119,7 @@
#define PCIE_MSI_STATUS_REG (CONTROL_BASE_ADDR + 0x58) #define PCIE_MSI_STATUS_REG (CONTROL_BASE_ADDR + 0x58)
#define PCIE_MSI_MASK_REG (CONTROL_BASE_ADDR + 0x5C) #define PCIE_MSI_MASK_REG (CONTROL_BASE_ADDR + 0x5C)
#define PCIE_MSI_PAYLOAD_REG (CONTROL_BASE_ADDR + 0x9C) #define PCIE_MSI_PAYLOAD_REG (CONTROL_BASE_ADDR + 0x9C)
#define PCIE_MSI_DATA_MASK GENMASK(15, 0)
/* PCIe window configuration */ /* PCIe window configuration */
#define OB_WIN_BASE_ADDR 0x4c00 #define OB_WIN_BASE_ADDR 0x4c00
@ -1319,8 +1320,12 @@ static void advk_pcie_handle_msi(struct advk_pcie *pcie)
if (!(BIT(msi_idx) & msi_status)) if (!(BIT(msi_idx) & msi_status))
continue; continue;
/*
* msi_idx contains bits [4:0] of the msi_data and msi_data
* contains 16bit MSI interrupt number
*/
advk_writel(pcie, BIT(msi_idx), PCIE_MSI_STATUS_REG); advk_writel(pcie, BIT(msi_idx), PCIE_MSI_STATUS_REG);
msi_data = advk_readl(pcie, PCIE_MSI_PAYLOAD_REG) & 0xFF; msi_data = advk_readl(pcie, PCIE_MSI_PAYLOAD_REG) & PCIE_MSI_DATA_MASK;
generic_handle_irq(msi_data); generic_handle_irq(msi_data);
} }