i2c: nvidia-gpu: add runtime pm support (d4a4f927) · Commits · 戴 / test

drivers/i2c/busses/i2c-nvidia-gpu.c

+21 −1

Original line number	Diff line number	Diff line
		@@ -176,6 +176,7 @@ static int gpu_i2c_master_xfer(struct i2c_adapter *adap,
		* The controller supports maximum 4 byte read due to known
		* limitation of sending STOP after every read.
		*/
		pm_runtime_get_sync(i2cd->dev);
		for (i = 0; i < num; i++) {
		if (msgs[i].flags & I2C_M_RD) {
		/* program client address before starting read */
		@@ -217,6 +218,8 @@ exit:
		if (status2 < 0)
		dev_err(i2cd->dev, "i2c stop failed %d\n", status2);
		}
		pm_runtime_mark_last_busy(i2cd->dev);
		pm_runtime_put_autosuspend(i2cd->dev);
		return status;
		}

		@@ -336,6 +339,11 @@ static int gpu_i2c_probe(struct pci_dev pdev, const struct pci_device_id id)
		goto del_adapter;
		}

		pm_runtime_set_autosuspend_delay(&pdev->dev, 3000);
		pm_runtime_use_autosuspend(&pdev->dev);
		pm_runtime_put_autosuspend(&pdev->dev);
		pm_runtime_allow(&pdev->dev);

		return 0;

		del_adapter:
		@@ -349,10 +357,21 @@ static void gpu_i2c_remove(struct pci_dev *pdev)
		{
		struct gpu_i2c_dev *i2cd = dev_get_drvdata(&pdev->dev);

		pm_runtime_get_noresume(i2cd->dev);
		i2c_del_adapter(&i2cd->adapter);
		pci_free_irq_vectors(pdev);
		}

		/*
		* We need gpu_i2c_suspend() even if it is stub, for runtime pm to work
		* correctly. Without it, lspci shows runtime pm status as "D0" for the card.
		* Documentation/power/pci.txt also insists for driver to provide this.
		*/
		static __maybe_unused int gpu_i2c_suspend(struct device *dev)
		{
		return 0;
		}

		static __maybe_unused int gpu_i2c_resume(struct device *dev)
		{
		struct gpu_i2c_dev *i2cd = dev_get_drvdata(dev);
		@@ -361,7 +380,8 @@ static __maybe_unused int gpu_i2c_resume(struct device *dev)
		return 0;
		}

		static UNIVERSAL_DEV_PM_OPS(gpu_i2c_driver_pm, NULL, gpu_i2c_resume, NULL);
		static UNIVERSAL_DEV_PM_OPS(gpu_i2c_driver_pm, gpu_i2c_suspend, gpu_i2c_resume,
		NULL);

		static struct pci_driver gpu_i2c_driver = {
		.name = "nvidia-gpu",

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