From dd5c4b741f129abdb5c64b17e649b324c45ec5c9 Mon Sep 17 00:00:00 2001
From: Akihiro Mizusawa <amizusawa@nvidia.com>
Date: Mon, 17 Mar 2025 22:08:53 +0000
Subject: [PATCH] host: nvcsi: Deprecate nvhost_module_pm_ops

Deprecate the usage of nvhost_module_pm_ops as part of the wider
nvhost API deprecation while maintaining equivalent functionality.

The NVCSI driver does not register prepare_poweroff, poweron_reset,
finalize_poweron callbacks nor set the clock gating regs with nvhost,
so the runtime operations will only call clk APIs.

Bug 4921620

Change-Id: I22a75c9f58ec0980aa97997b674c26a9bb62d47b
Signed-off-by: Akihiro Mizusawa <amizusawa@nvidia.com>
Signed-off-by: Mainak Sen <msen@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3321086
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Frank Chen <frankc@nvidia.com>
Reviewed-by: Chinniah Poosapadi <cpoosapadi@nvidia.com>
Reviewed-by: FNU Raunak <fraunak@nvidia.com>
Tested-by: FNU Raunak <fraunak@nvidia.com>
---
 drivers/video/tegra/host/nvcsi/nvcsi-t194.c | 31 ++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/video/tegra/host/nvcsi/nvcsi-t194.c b/drivers/video/tegra/host/nvcsi/nvcsi-t194.c
index bf00e238..30cee0e1 100644
--- a/drivers/video/tegra/host/nvcsi/nvcsi-t194.c
+++ b/drivers/video/tegra/host/nvcsi/nvcsi-t194.c
@@ -309,6 +309,35 @@ static int __exit t194_nvcsi_remove(struct platform_device *dev)
 	return 0;
 }
 
+static int t194_nvcsi_runtime_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct nvhost_device_data *info = platform_get_drvdata(pdev);
+
+	clk_bulk_disable_unprepare(info->num_clks, info->clks);
+
+	return 0;
+}
+
+static int t194_nvcsi_runtime_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct nvhost_device_data *pdata = platform_get_drvdata(pdev);
+	int err;
+
+	err = clk_bulk_prepare_enable(pdata->num_clks, pdata->clks);
+	if (err) {
+		dev_warn(dev, "failed to enable clocks: %d\n", err);
+		return err;
+	}
+
+	return 0;
+}
+
+const struct dev_pm_ops t194_nvcsi_pm_ops = {
+	SET_RUNTIME_PM_OPS(t194_nvcsi_runtime_suspend, t194_nvcsi_runtime_resume, NULL)
+};
+
 #if defined(NV_PLATFORM_DRIVER_STRUCT_REMOVE_RETURNS_VOID) /* Linux v6.11 */
 static void t194_nvcsi_remove_wrapper(struct platform_device *pdev)
 {
@@ -331,7 +360,7 @@ static struct platform_driver t194_nvcsi_driver = {
 		.of_match_table = tegra194_nvcsi_of_match,
 #endif
 #ifdef CONFIG_PM
-		.pm = &nvhost_module_pm_ops,
+		.pm = &t194_nvcsi_pm_ops,
 #endif
 	},
 };