From c555e49cf12877d8f965c2dd48101fa97ccb6010 Mon Sep 17 00:00:00 2001
From: Akihiro Mizusawa <amizusawa@nvidia.com>
Date: Mon, 17 Mar 2025 22:05:31 +0000
Subject: [PATCH] host: isp: 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 ISP 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: Iadf7b4104f622507e8b2e82fe054151e6318d747
Signed-off-by: Akihiro Mizusawa <amizusawa@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3321084
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Tested-by: FNU Raunak <fraunak@nvidia.com>
Reviewed-by: Frank Chen <frankc@nvidia.com>
Reviewed-by: FNU Raunak <fraunak@nvidia.com>
Reviewed-by: Chinniah Poosapadi <cpoosapadi@nvidia.com>
Reviewed-by: svcacv <svcacv@nvidia.com>
---
 drivers/video/tegra/host/isp/isp5.c | 34 ++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/drivers/video/tegra/host/isp/isp5.c b/drivers/video/tegra/host/isp/isp5.c
index ad3d6624..e1ff1796 100644
--- a/drivers/video/tegra/host/isp/isp5.c
+++ b/drivers/video/tegra/host/isp/isp5.c
@@ -32,6 +32,7 @@
 #include <linux/uaccess.h>
 #include <linux/version.h>
 #include <linux/nvhost.h>
+#include <linux/reset.h>
 #include <media/fusa-capture/capture-isp-channel.h>
 #include <media/tegra_camera_platform.h>
 #include <soc/tegra/camrtc-capture.h>
@@ -611,6 +612,37 @@ static const struct of_device_id tegra_isp5_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, tegra_isp5_of_match);
 
+static int isp_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 isp_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 isp_pm_ops = {
+	SET_RUNTIME_PM_OPS(isp_runtime_suspend, isp_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
+};
+
 #if defined(NV_PLATFORM_DRIVER_STRUCT_REMOVE_RETURNS_VOID) /* Linux v6.11 */
 static void isp5_remove_wrapper(struct platform_device *pdev)
 {
@@ -633,7 +665,7 @@ static struct platform_driver isp5_driver = {
 		.of_match_table = tegra_isp5_of_match,
 #endif
 #ifdef CONFIG_PM
-		.pm = &nvhost_module_pm_ops,
+		.pm = &isp_pm_ops,
 #endif
 	},
 };