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PCI: mediatek-gen3: Add a .shutdown() callback to control PERST# signal

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Add a .shutdown() callback to control the timing of PERST# and power during
system shutdown to ensure that PERST# is asserted before power to the
connector is removed, as required by PCIe CEM r6.0, sec 2.2.

Signed-off-by: Jian Yang <jian.yang@mediatek.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260413071401.1151-3-jian.yang@mediatek.com
This commit is contained in:
Jian Yang 2026-04-13 15:13:56 +08:00 committed by Bjorn Helgaas
parent 22fc8822d1
commit 7a0e17e7a0
1 changed files with 9 additions and 0 deletions
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9
drivers/pci/controller/pcie-mediatek-gen3.c
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@ -1286,6 +1286,14 @@ static void mtk_pcie_remove(struct platform_device *pdev)
mtk_pcie_irq_teardown(pcie);
}
static void mtk_pcie_shutdown(struct platform_device *pdev)
{
struct mtk_gen3_pcie *pcie = platform_get_drvdata(pdev);
mtk_pcie_devices_power_down(pcie);
mtk_pcie_power_down(pcie);
}
static void mtk_pcie_irq_save(struct mtk_gen3_pcie *pcie)
{
int i;
@ -1424,6 +1432,7 @@ MODULE_DEVICE_TABLE(of, mtk_pcie_of_match);
static struct platform_driver mtk_pcie_driver = {
.probe = mtk_pcie_probe,
.remove = mtk_pcie_remove,
.shutdown = mtk_pcie_shutdown,
.driver = {
.name = "mtk-pcie-gen3",
.of_match_table = mtk_pcie_of_match,