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Merge branch 'pci/imx6'

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- Enable MSI for imx6 downstream components (Richard Zhu)

* pci/imx6:
  PCI: imx: Enable MSI from downstream components
This commit is contained in:
Bjorn Helgaas 2019-01-02 15:31:15 -06:00
commit 72199051af
1 changed files with 10 additions and 0 deletions
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10
drivers/pci/controller/dwc/pci-imx6.c
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@ -74,6 +74,7 @@ struct imx6_pcie {
#define PHY_PLL_LOCK_WAIT_USLEEP_MAX 200 #define PHY_PLL_LOCK_WAIT_USLEEP_MAX 200
/* PCIe Root Complex registers (memory-mapped) */ /* PCIe Root Complex registers (memory-mapped) */
#define PCIE_RC_IMX6_MSI_CAP 0x50
#define PCIE_RC_LCR 0x7c #define PCIE_RC_LCR 0x7c
#define PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN1 0x1 #define PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN1 0x1
#define PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN2 0x2 #define PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN2 0x2
@ -926,6 +927,7 @@ static int imx6_pcie_probe(struct platform_device *pdev)
struct resource *dbi_base; struct resource *dbi_base;
struct device_node *node = dev->of_node; struct device_node *node = dev->of_node;
int ret; int ret;
u16 val;
imx6_pcie = devm_kzalloc(dev, sizeof(*imx6_pcie), GFP_KERNEL); imx6_pcie = devm_kzalloc(dev, sizeof(*imx6_pcie), GFP_KERNEL);
if (!imx6_pcie) if (!imx6_pcie)
@ -1071,6 +1073,14 @@ static int imx6_pcie_probe(struct platform_device *pdev)
if (ret < 0) if (ret < 0)
return ret; return ret;
if (pci_msi_enabled()) {
val = dw_pcie_readw_dbi(pci, PCIE_RC_IMX6_MSI_CAP +
PCI_MSI_FLAGS);
val |= PCI_MSI_FLAGS_ENABLE;
dw_pcie_writew_dbi(pci, PCIE_RC_IMX6_MSI_CAP + PCI_MSI_FLAGS,
val);
}
return 0; return 0;
} }