drivers/gpu/drm/sti/sti_tvout.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/sti/sti_tvout.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/sti/sti_tvout.c
Extension
.c
Size
24996 bytes
Lines
890
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 sti_tvout {
	struct device *dev;
	struct drm_device *drm_dev;
	void __iomem *regs;
	struct reset_control *reset;
	struct drm_encoder *hdmi;
	struct drm_encoder *hda;
	struct drm_encoder *dvo;
	bool debugfs_registered;
};

struct sti_tvout_encoder {
	struct drm_encoder encoder;
	struct sti_tvout *tvout;
};

#define to_sti_tvout_encoder(x) \
	container_of(x, struct sti_tvout_encoder, encoder)

#define to_sti_tvout(x) to_sti_tvout_encoder(x)->tvout

/* preformatter conversion matrix */
static const u32 rgb_to_ycbcr_601[8] = {
	0xF927082E, 0x04C9FEAB, 0x01D30964, 0xFA95FD3D,
	0x0000082E, 0x00002000, 0x00002000, 0x00000000
};

/* 709 RGB to YCbCr */
static const u32 rgb_to_ycbcr_709[8] = {
	0xF891082F, 0x0367FF40, 0x01280B71, 0xF9B1FE20,
	0x0000082F, 0x00002000, 0x00002000, 0x00000000
};

static u32 tvout_read(struct sti_tvout *tvout, int offset)
{
	return readl(tvout->regs + offset);
}

static void tvout_write(struct sti_tvout *tvout, u32 val, int offset)
{
	writel(val, tvout->regs + offset);
}

/**
 * tvout_vip_set_color_order - Set the clipping mode of a VIP
 *
 * @tvout: tvout structure
 * @reg: register to set
 * @cr_r: red chroma or red order
 * @y_g: y or green order
 * @cb_b: blue chroma or blue order
 */
static void tvout_vip_set_color_order(struct sti_tvout *tvout, int reg,
				      u32 cr_r, u32 y_g, u32 cb_b)
{
	u32 val = tvout_read(tvout, reg);

	val &= ~(TVO_VIP_REORDER_MASK << TVO_VIP_REORDER_R_SHIFT);
	val &= ~(TVO_VIP_REORDER_MASK << TVO_VIP_REORDER_G_SHIFT);
	val &= ~(TVO_VIP_REORDER_MASK << TVO_VIP_REORDER_B_SHIFT);
	val |= cr_r << TVO_VIP_REORDER_R_SHIFT;
	val |= y_g << TVO_VIP_REORDER_G_SHIFT;
	val |= cb_b << TVO_VIP_REORDER_B_SHIFT;

	tvout_write(tvout, val, reg);
}

/**
 * tvout_vip_set_clip_mode - Set the clipping mode of a VIP
 *
 * @tvout: tvout structure
 * @reg: register to set
 * @range: clipping range
 */
static void tvout_vip_set_clip_mode(struct sti_tvout *tvout, int reg, u32 range)
{
	u32 val = tvout_read(tvout, reg);

	val &= ~(TVO_VIP_CLIP_MASK << TVO_VIP_CLIP_SHIFT);
	val |= range << TVO_VIP_CLIP_SHIFT;
	tvout_write(tvout, val, reg);
}

/**
 * tvout_vip_set_rnd - Set the rounded value of a VIP
 *
 * @tvout: tvout structure
 * @reg: register to set
 * @rnd: rounded val per component
 */

Annotation

Implementation Notes