drivers/gpu/drm/imx/dcss/dcss-dev.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/imx/dcss/dcss-dev.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/imx/dcss/dcss-dev.c
Extension
.c
Size
6644 bytes
Lines
322
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (IS_ERR(*clks[i].clk)) {
			dev_err(dcss->dev, "failed to get %s clock\n",
				clks[i].id);
			return PTR_ERR(*clks[i].clk);
		}
	}

	return 0;
}

static void dcss_clks_release(struct dcss_dev *dcss)
{
	devm_clk_put(dcss->dev, dcss->dtrc_clk);
	devm_clk_put(dcss->dev, dcss->rtrm_clk);
	devm_clk_put(dcss->dev, dcss->pix_clk);
	devm_clk_put(dcss->dev, dcss->axi_clk);
	devm_clk_put(dcss->dev, dcss->apb_clk);
}

struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output)
{
	struct platform_device *pdev = to_platform_device(dev);
	int ret;
	struct resource *res;
	struct dcss_dev *dcss;
	const struct dcss_type_data *devtype;

	devtype = of_device_get_match_data(dev);
	if (!devtype) {
		dev_err(dev, "no device match found\n");
		return ERR_PTR(-ENODEV);
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(dev, "cannot get memory resource\n");
		return ERR_PTR(-EINVAL);
	}

	if (!devm_request_mem_region(dev, res->start, resource_size(res), "dcss")) {
		dev_err(dev, "cannot request memory region\n");
		return ERR_PTR(-EBUSY);
	}

	dcss = devm_kzalloc(dev, sizeof(*dcss), GFP_KERNEL);
	if (!dcss)
		return ERR_PTR(-ENOMEM);

	dcss->dev = dev;
	dcss->devtype = devtype;
	dcss->hdmi_output = hdmi_output;

	ret = dcss_clks_init(dcss);
	if (ret) {
		dev_err(dev, "clocks initialization failed\n");
		return ERR_PTR(ret);
	}

	dcss->of_port = of_graph_get_port_by_id(dev->of_node, 0);
	if (!dcss->of_port) {
		dev_err(dev, "no port@0 node in %pOF\n", dev->of_node);
		ret = -ENODEV;
		goto clks_err;
	}

	dcss->start_addr = res->start;

	ret = dcss_submodules_init(dcss);
	if (ret) {
		of_node_put(dcss->of_port);
		dev_err(dev, "submodules initialization failed\n");
		goto clks_err;
	}

	init_completion(&dcss->disable_completion);

	pm_runtime_set_autosuspend_delay(dev, 100);
	pm_runtime_use_autosuspend(dev);
	pm_runtime_set_suspended(dev);
	pm_runtime_allow(dev);
	pm_runtime_enable(dev);

	return dcss;

clks_err:
	dcss_clks_release(dcss);

	return ERR_PTR(ret);
}

Annotation

Implementation Notes