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

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

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/imx/dcss/dcss-drv.c
Extension
.c
Size
2758 bytes
Lines
129
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

struct dcss_drv {
	struct dcss_dev *dcss;
	struct dcss_kms_dev *kms;
};

struct dcss_dev *dcss_drv_dev_to_dcss(struct device *dev)
{
	struct dcss_drv *mdrv = dev_get_drvdata(dev);

	return mdrv ? mdrv->dcss : NULL;
}

struct drm_device *dcss_drv_dev_to_drm(struct device *dev)
{
	struct dcss_drv *mdrv = dev_get_drvdata(dev);

	return mdrv ? &mdrv->kms->base : NULL;
}

static int dcss_drv_platform_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *remote;
	struct dcss_drv *mdrv;
	int err = 0;
	bool hdmi_output = true;

	if (!dev->of_node)
		return -ENODEV;

	remote = of_graph_get_remote_node(dev->of_node, 0, 0);
	if (!remote)
		return -ENODEV;

	hdmi_output = !of_device_is_compatible(remote, "fsl,imx8mq-nwl-dsi");

	of_node_put(remote);

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

	mdrv->dcss = dcss_dev_create(dev, hdmi_output);
	if (IS_ERR(mdrv->dcss))
		return PTR_ERR(mdrv->dcss);

	dev_set_drvdata(dev, mdrv);

	mdrv->kms = dcss_kms_attach(mdrv->dcss);
	if (IS_ERR(mdrv->kms)) {
		err = PTR_ERR(mdrv->kms);
		dev_err_probe(dev, err, "Failed to initialize KMS\n");
		goto dcss_shutoff;
	}

	return 0;

dcss_shutoff:
	dcss_dev_destroy(mdrv->dcss);

	return err;
}

static void dcss_drv_platform_remove(struct platform_device *pdev)
{
	struct dcss_drv *mdrv = dev_get_drvdata(&pdev->dev);

	dcss_kms_detach(mdrv->kms);
	dcss_dev_destroy(mdrv->dcss);
}

static void dcss_drv_platform_shutdown(struct platform_device *pdev)
{
	struct dcss_drv *mdrv = dev_get_drvdata(&pdev->dev);

	dcss_kms_shutdown(mdrv->kms);
}

static struct dcss_type_data dcss_types[] = {
	[DCSS_IMX8MQ] = {
		.name = "DCSS_IMX8MQ",
		.blkctl_ofs = 0x2F000,
		.ctxld_ofs = 0x23000,
		.dtg_ofs = 0x20000,
		.scaler_ofs = 0x1C000,
		.ss_ofs = 0x1B000,
		.dpr_ofs = 0x18000,
	},
};

Annotation

Implementation Notes