Re: [RFC PATCH v2 11/22] ASoC: qcom: Add USB backend ASoC driver for Q6

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On 26/01/2023 03:14, Wesley Cheng wrote:
+}
+
+static int q6usb_dai_dev_probe(struct platform_device *pdev)
+{
...
+	data->priv.domain = iommu_domain_alloc(pdev->dev.bus);
+	if (!data->priv.domain) {
+		dev_err(&pdev->dev, "failed to allocate iommu domain\n");
+		return -ENODEV;
+	}
+
+	/* attach to external processor iommu */
+	ret = iommu_attach_device(data->priv.domain, &pdev->dev);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to attach device ret = %d\n", ret);
+		goto free_domain;
+	}
+
Why are we doing this manually here? device core should take care of attaching iommu to the device instance.

...


+detach_device:
+	iommu_detach_device(data->priv.domain, &pdev->dev);
+free_domain:
+	iommu_domain_free(data->priv.domain);
+
+	return ret;
+}
+
+static int q6usb_dai_dev_remove(struct platform_device *pdev)
+{
+	struct q6usb_port_data *data = platform_get_drvdata(pdev);
+
+	iommu_detach_device(data->priv.domain, &pdev->dev);
+	iommu_domain_free(data->priv.domain);
+



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