drivers/gpu/drm/exynos/exynos_drm_gsc.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/exynos/exynos_drm_gsc.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/exynos/exynos_drm_gsc.c
Extension
.c
Size
37901 bytes
Lines
1430
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 gsc_scaler {
	bool	range;
	u32	pre_shfactor;
	u32	pre_hratio;
	u32	pre_vratio;
	unsigned long main_hratio;
	unsigned long main_vratio;
};

/*
 * A structure of gsc context.
 *
 * @regs: memory mapped io registers.
 * @gsc_clk: gsc gate clock.
 * @sc: scaler infomations.
 * @id: gsc id.
 * @irq: irq number.
 * @rotation: supports rotation of src.
 */
struct gsc_context {
	struct exynos_drm_ipp ipp;
	struct drm_device *drm_dev;
	void		*dma_priv;
	struct device	*dev;
	struct exynos_drm_ipp_task	*task;
	struct exynos_drm_ipp_formats	*formats;
	unsigned int			num_formats;

	void __iomem	*regs;
	const char	*const *clk_names;
	struct clk	*clocks[GSC_MAX_CLOCKS];
	int		num_clocks;
	struct gsc_scaler	sc;
	int	id;
	int	irq;
	bool	rotation;
};

/**
 * struct gsc_driverdata - per device type driver data for init time.
 *
 * @limits: picture size limits array
 * @num_limits: number of items in the aforementioned array
 * @clk_names: names of clocks needed by this variant
 * @num_clocks: the number of clocks needed by this variant
 */
struct gsc_driverdata {
	const struct drm_exynos_ipp_limit *limits;
	int		num_limits;
	const char	*clk_names[GSC_MAX_CLOCKS];
	int		num_clocks;
};

/* 8-tap Filter Coefficient */
static const int h_coef_8t[GSC_COEF_RATIO][GSC_COEF_ATTR][GSC_COEF_H_8T] = {
	{	/* Ratio <= 65536 (~8:8) */
		{  0,  0,   0, 128,   0,   0,  0,  0 },
		{ -1,  2,  -6, 127,   7,  -2,  1,  0 },
		{ -1,  4, -12, 125,  16,  -5,  1,  0 },
		{ -1,  5, -15, 120,  25,  -8,  2,  0 },
		{ -1,  6, -18, 114,  35, -10,  3, -1 },
		{ -1,  6, -20, 107,  46, -13,  4, -1 },
		{ -2,  7, -21,  99,  57, -16,  5, -1 },
		{ -1,  6, -20,  89,  68, -18,  5, -1 },
		{ -1,  6, -20,  79,  79, -20,  6, -1 },
		{ -1,  5, -18,  68,  89, -20,  6, -1 },
		{ -1,  5, -16,  57,  99, -21,  7, -2 },
		{ -1,  4, -13,  46, 107, -20,  6, -1 },
		{ -1,  3, -10,  35, 114, -18,  6, -1 },
		{  0,  2,  -8,  25, 120, -15,  5, -1 },
		{  0,  1,  -5,  16, 125, -12,  4, -1 },
		{  0,  1,  -2,   7, 127,  -6,  2, -1 }
	}, {	/* 65536 < Ratio <= 74898 (~8:7) */
		{  3, -8,  14, 111,  13,  -8,  3,  0 },
		{  2, -6,   7, 112,  21, -10,  3, -1 },
		{  2, -4,   1, 110,  28, -12,  4, -1 },
		{  1, -2,  -3, 106,  36, -13,  4, -1 },
		{  1, -1,  -7, 103,  44, -15,  4, -1 },
		{  1,  1, -11,  97,  53, -16,  4, -1 },
		{  0,  2, -13,  91,  61, -16,  4, -1 },
		{  0,  3, -15,  85,  69, -17,  4, -1 },
		{  0,  3, -16,  77,  77, -16,  3,  0 },
		{ -1,  4, -17,  69,  85, -15,  3,  0 },
		{ -1,  4, -16,  61,  91, -13,  2,  0 },
		{ -1,  4, -16,  53,  97, -11,  1,  1 },
		{ -1,  4, -15,  44, 103,  -7, -1,  1 },
		{ -1,  4, -13,  36, 106,  -3, -2,  1 },
		{ -1,  4, -12,  28, 110,   1, -4,  2 },
		{ -1,  3, -10,  21, 112,   7, -6,  2 }
	}, {	/* 74898 < Ratio <= 87381 (~8:6) */

Annotation

Implementation Notes