drivers/gpu/ipu-v3/ipu-vdi.c

Source file repositories/reference/linux-study-clean/drivers/gpu/ipu-v3/ipu-vdi.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/ipu-v3/ipu-vdi.c
Extension
.c
Size
4961 bytes
Lines
224
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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 ipu_vdi {
	void __iomem *base;
	u32 module;
	spinlock_t lock;
	int use_count;
	struct ipu_soc *ipu;
};


/* VDI Register Offsets */
#define VDI_FSIZE 0x0000
#define VDI_C     0x0004

/* VDI Register Fields */
#define VDI_C_CH_420             (0 << 1)
#define VDI_C_CH_422             (1 << 1)
#define VDI_C_MOT_SEL_MASK       (0x3 << 2)
#define VDI_C_MOT_SEL_FULL       (2 << 2)
#define VDI_C_MOT_SEL_LOW        (1 << 2)
#define VDI_C_MOT_SEL_MED        (0 << 2)
#define VDI_C_BURST_SIZE1_4      (3 << 4)
#define VDI_C_BURST_SIZE2_4      (3 << 8)
#define VDI_C_BURST_SIZE3_4      (3 << 12)
#define VDI_C_BURST_SIZE_MASK    0xF
#define VDI_C_BURST_SIZE1_OFFSET 4
#define VDI_C_BURST_SIZE2_OFFSET 8
#define VDI_C_BURST_SIZE3_OFFSET 12
#define VDI_C_VWM1_SET_1         (0 << 16)
#define VDI_C_VWM1_SET_2         (1 << 16)
#define VDI_C_VWM1_CLR_2         (1 << 19)
#define VDI_C_VWM3_SET_1         (0 << 22)
#define VDI_C_VWM3_SET_2         (1 << 22)
#define VDI_C_VWM3_CLR_2         (1 << 25)
#define VDI_C_TOP_FIELD_MAN_1    (1 << 30)
#define VDI_C_TOP_FIELD_AUTO_1   (1 << 31)

static inline u32 ipu_vdi_read(struct ipu_vdi *vdi, unsigned int offset)
{
	return readl(vdi->base + offset);
}

static inline void ipu_vdi_write(struct ipu_vdi *vdi, u32 value,
				 unsigned int offset)
{
	writel(value, vdi->base + offset);
}

void ipu_vdi_set_field_order(struct ipu_vdi *vdi, v4l2_std_id std, u32 field)
{
	bool top_field_0 = false;
	unsigned long flags;
	u32 reg;

	switch (field) {
	case V4L2_FIELD_INTERLACED_TB:
	case V4L2_FIELD_SEQ_TB:
	case V4L2_FIELD_TOP:
		top_field_0 = true;
		break;
	case V4L2_FIELD_INTERLACED_BT:
	case V4L2_FIELD_SEQ_BT:
	case V4L2_FIELD_BOTTOM:
		top_field_0 = false;
		break;
	default:
		top_field_0 = (std & V4L2_STD_525_60) ? true : false;
		break;
	}

	spin_lock_irqsave(&vdi->lock, flags);

	reg = ipu_vdi_read(vdi, VDI_C);
	if (top_field_0)
		reg &= ~(VDI_C_TOP_FIELD_MAN_1 | VDI_C_TOP_FIELD_AUTO_1);
	else
		reg |= VDI_C_TOP_FIELD_MAN_1 | VDI_C_TOP_FIELD_AUTO_1;
	ipu_vdi_write(vdi, reg, VDI_C);

	spin_unlock_irqrestore(&vdi->lock, flags);
}
EXPORT_SYMBOL_GPL(ipu_vdi_set_field_order);

void ipu_vdi_set_motion(struct ipu_vdi *vdi, enum ipu_motion_sel motion_sel)
{
	unsigned long flags;
	u32 reg;

	spin_lock_irqsave(&vdi->lock, flags);

	reg = ipu_vdi_read(vdi, VDI_C);

Annotation

Implementation Notes