PCI: imx6: Delay link start until configfs 'start' written

commit 2e6ea70690ddd1ffa422423fd0d4523e4dfe4b62 upstream.

According to Documentation/PCI/endpoint/pci-endpoint-cfs.rst, the Endpoint
controller (EPC) should only start the link when userspace writes '1' to
the '/sys/kernel/config/pci_ep/controllers/<EPC>/start' attribute, which
ultimately results in calling imx_pcie_start_link() via
pci_epc_start_store().

To align with the documented behavior, do not start the link automatically
when adding the EP controller.

Fixes: 75c2f26da03f ("PCI: imx6: Add i.MX PCIe EP mode support")
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
[mani: reworded commit subject and description]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
[bhelgaas: commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20250709033722.2924372-3-hongxing.zhu@nxp.com
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 f5f2ac638f4bab894d197032545cdefb4d3fcf6c..fda03512944d52fe9be0ceb6b5c90a9f189f1702 100644 (file)
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -1468,9 +1468,6 @@ static int imx_add_pcie_ep(struct imx_pcie *imx_pcie,
 
        pci_epc_init_notify(ep->epc);
 
-       /* Start LTSSM. */
-       imx_pcie_ltssm_enable(dev);
-
        return 0;
 }