[PATCH 2/2] PCI: mediatek-gen3: Add a shutdown callback to cotnrol PERST# signal

[Jian Yang <jian.yang@mediatek.com>]

Add a shutdown callback to control the timing of PERST# and power
during system shutdown, ensuring that the PERST#, as required by the
PCIe CEM specification, is active before the power on connector is
removed.

Signed-off-by: Jian Yang <jian.yang@mediatek.com>
---
 drivers/pci/controller/pcie-mediatek-gen3.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
index 58ba1aa35a22..4915979968b9 100644
--- a/drivers/pci/controller/pcie-mediatek-gen3.c
+++ b/drivers/pci/controller/pcie-mediatek-gen3.c
@@ -1285,6 +1285,14 @@ 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;
@@ -1423,6 +1431,7 @@ 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,
-- 
2.45.2