drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_hw.c

Source file repositories/reference/linux-study-clean/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_hw.c

File Facts

System
Linux kernel
Corpus path
drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_hw.c
Extension
.c
Size
5100 bytes
Lines
202
Domain
Driver Families
Bucket
drivers/media
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 (!test_bit(hw_idx, vdec_dev->subdev_bitmap)) {
			dev_err(&pdev->dev, "vdec %d is not ready", hw_idx);
			return -EAGAIN;
		}
	}

	return 0;
}

static irqreturn_t mtk_vdec_hw_irq_handler(int irq, void *priv)
{
	struct mtk_vdec_hw_dev *dev = priv;
	struct mtk_vcodec_dec_ctx *ctx;
	u32 cg_status;
	unsigned int dec_done_status;
	void __iomem *vdec_misc_addr = dev->reg_base[VDEC_HW_MISC] +
					VDEC_IRQ_CFG_REG;

	ctx = mtk_vcodec_get_curr_ctx(dev->main_dev, dev->hw_idx);

	/* check if HW active or not */
	cg_status = readl(dev->reg_base[VDEC_HW_SYS] + VDEC_HW_ACTIVE_ADDR);
	if (cg_status & VDEC_HW_ACTIVE_MASK) {
		mtk_v4l2_vdec_err(ctx, "vdec active is not 0x0 (0x%08x)", cg_status);
		return IRQ_HANDLED;
	}

	dec_done_status = readl(vdec_misc_addr);
	if ((dec_done_status & MTK_VDEC_IRQ_STATUS_DEC_SUCCESS) !=
	    MTK_VDEC_IRQ_STATUS_DEC_SUCCESS)
		return IRQ_HANDLED;

	/* clear interrupt */
	writel(dec_done_status | VDEC_IRQ_CFG, vdec_misc_addr);
	writel(dec_done_status & ~VDEC_IRQ_CLR, vdec_misc_addr);

	wake_up_dec_ctx(ctx, MTK_INST_IRQ_RECEIVED, dev->hw_idx);

	mtk_v4l2_vdec_dbg(3, ctx, "wake up ctx %d, dec_done_status=%x",
			  ctx->id, dec_done_status);

	return IRQ_HANDLED;
}

static int mtk_vdec_hw_init_irq(struct mtk_vdec_hw_dev *dev)
{
	struct platform_device *pdev = dev->plat_dev;
	int ret;

	dev->dec_irq = platform_get_irq(pdev, 0);
	if (dev->dec_irq < 0)
		return dev->dec_irq;

	irq_set_status_flags(dev->dec_irq, IRQ_NOAUTOEN);
	ret = devm_request_irq(&pdev->dev, dev->dec_irq,
			       mtk_vdec_hw_irq_handler, 0, pdev->name, dev);
	if (ret) {
		dev_err(&pdev->dev, "Failed to install dev->dec_irq %d (%d)",
			dev->dec_irq, ret);
		return ret;
	}

	return 0;
}

static int mtk_vdec_hw_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct mtk_vdec_hw_dev *subdev_dev;
	struct mtk_vcodec_dec_dev *main_dev;
	const struct of_device_id *of_id;
	int hw_idx;
	int ret;

	if (!dev->parent) {
		dev_err(dev, "no parent for hardware devices.\n");
		return -ENODEV;
	}

	main_dev = dev_get_drvdata(dev->parent);
	if (!main_dev) {
		dev_err(dev, "failed to get parent driver data");
		return -EINVAL;
	}

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

	subdev_dev->plat_dev = pdev;

Annotation

Implementation Notes