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

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commit 2e6ea70690 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: 75c2f26da0 ("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>
This commit is contained in:
Richard Zhu
2025-07-09 11:37:22 +08:00
committed by Greg Kroah-Hartman
parent 6182c00bc0
commit 8ba110b3df
1 changed files with 0 additions and 3 deletions
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3
drivers/pci/controller/dwc/pci-imx6.c
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@@ -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;
}