diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
index 3e8d70bfabc6a913cdd48bcb94a435646b344c30..5d9fd36b02d18122cc222d6e7eafff886b300fbf 100644
--- a/drivers/pci/controller/pcie-mediatek-gen3.c
+++ b/drivers/pci/controller/pcie-mediatek-gen3.c
@@ -838,6 +838,14 @@ static int mtk_pcie_setup(struct mtk_gen3_pcie *pcie)
 	if (err)
 		return err;
 
+	/*
+	 * The controller may have been left out of reset by the bootloader
+	 * so make sure that we get a clean start by asserting resets here.
+	 */
+	reset_control_assert(pcie->phy_reset);
+	reset_control_assert(pcie->mac_reset);
+	usleep_range(10, 20);
+
 	/* Don't touch the hardware registers before power up */
 	err = mtk_pcie_power_up(pcie);
 	if (err)