From: Kevin.xie <kevin.xie@starfivetech.com>
Date: Thu, 13 Oct 2022 03:29:30 +0000 (+0800)
Subject: drivers: pci: Support system pm no irq ops.
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1c1671ff173d0fab2b53c16b7dd28378f7ffb934;p=platform%2Fkernel%2Flinux-starfive.git

drivers: pci: Support system pm no irq ops.

Because of the limitation of hardware design, only enable/disable clk here.

Signed-off-by: Kevin.xie <kevin.xie@starfivetech.com>
---

diff --git a/drivers/pci/controller/pcie-plda.c b/drivers/pci/controller/pcie-plda.c
index 213808ed958c..cde8f7bc6155 100644
--- a/drivers/pci/controller/pcie-plda.c
+++ b/drivers/pci/controller/pcie-plda.c
@@ -990,6 +990,40 @@ static int plda_pcie_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int __maybe_unused plda_pcie_suspend_noirq(struct device *dev)
+{
+	struct plda_pcie *pcie = dev_get_drvdata(dev);
+
+	if (!pcie)
+		return 0;
+
+	clk_bulk_disable_unprepare(pcie->num_clks, pcie->clks);
+
+	return 0;
+}
+
+static int __maybe_unused plda_pcie_resume_noirq(struct device *dev)
+{
+	struct plda_pcie *pcie = dev_get_drvdata(dev);
+	int ret;
+
+	if (!pcie)
+		return 0;
+
+	ret = clk_bulk_prepare_enable(pcie->num_clks, pcie->clks);
+	if (ret)
+		dev_err(dev, "Failed to enable clocks\n");
+
+	return ret;
+}
+
+static const struct dev_pm_ops plda_pcie_pm_ops = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(plda_pcie_suspend_noirq,
+				      plda_pcie_resume_noirq)
+};
+#endif
+
 static const struct of_device_id plda_pcie_of_match[] = {
 	{ .compatible = "plda,pci-xpressrich3-axi"},
 	{ .compatible = "starfive,jh7110-pcie"},
@@ -1001,6 +1035,9 @@ static struct platform_driver plda_pcie_driver = {
 	.driver = {
 		.name = KBUILD_MODNAME,
 		.of_match_table = of_match_ptr(plda_pcie_of_match),
+#ifdef CONFIG_PM_SLEEP
+		.pm = &plda_pcie_pm_ops,
+#endif
 	},
 	.probe = plda_pcie_probe,
 	.remove = plda_pcie_remove,