[PATCH v4 02/12] PCI: imx6: Fix i.MX8MP PCIe EP's occasional failure to trigger MSI

[Frank Li]

From: Richard Zhu <hongxing.zhu@xxxxxxx>

Correct occasional MSI triggering failures in i.MX8MP PCIe EP by apply 64KB
hardware alignment requirement.

MSI triggering fail if the outbound MSI memory region (ep->msi_mem) is not
aligned to 64KB.

In dw_pcie_ep_init():

ep->msi_mem = pci_epc_mem_alloc_addr(epc, &ep->msi_mem_phys,
				     epc->mem->window.page_size);

Set ep->page_size to match drvdata::epc_features::align since different
SOCs have different alignment requirements.

Fixes: 1bd0d43dcf3b ("PCI: imx6: Clean up addr_space retrieval code")
Signed-off-by: Richard Zhu <hongxing.zhu@xxxxxxx>
Acked-by: Jason Liu <jason.hui.liu@xxxxxxx>
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
 drivers/pci/controller/dwc/pci-imx6.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index e43eda6b33ca7..6c4d25b92225e 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -1118,6 +1118,8 @@ static int imx6_add_pcie_ep(struct imx6_pcie *imx6_pcie,
 	if (imx6_check_flag(imx6_pcie, IMX6_PCIE_FLAG_SUPPORT_64BIT))
 		dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
 
+	ep->page_size = imx6_pcie->drvdata->epc_features->align;
+
 	ret = dw_pcie_ep_init(ep);
 	if (ret) {
 		dev_err(dev, "failed to initialize endpoint\n");

-- 
2.34.1