PCI: imx6: Fix i.MX8MP PCIe EP's occasional failure to trigger MSI

commit 5cb3aa92c7cf182940ae575c3f450d3708af087c upstream.

Correct occasional MSI triggering failures in i.MX8MP PCIe EP by applying
the correct hardware outbound alignment requirement.

The i.MX platform has a restriction about outbound address translation. The
pci-epc-mem uses page_size to manage it. Set the correct page_size for i.MX
platform to meet the hardware requirement, which is the same as inbound
address alignment.

Thus, align it with epc_features::align.

Fixes: 1bd0d43dcf3b ("PCI: imx6: Clean up addr_space retrieval code")
Link: https://lore.kernel.org/linux-pci/20240729-pci2_upstream-v8-2-b68ee5ef2b4d@nxp.com
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: Jason Liu <jason.hui.liu@nxp.com>
Cc: <stable@vger.kernel.org> # 6.9+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 7074184278e942cfdc3d9f1d91f7c73a806bd6fa..dbd6d7a2748930518969f47e7779b64b09543a43 100644 (file)
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -1119,6 +1119,8 @@ 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");