drivers/gpu/drm/i915/display/intel_overlay.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/i915/display/intel_overlay.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/i915/display/intel_overlay.c
Extension
.c
Size
28420 bytes
Lines
1073
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 overlay_registers {
	u32 OBUF_0Y;
	u32 OBUF_1Y;
	u32 OBUF_0U;
	u32 OBUF_0V;
	u32 OBUF_1U;
	u32 OBUF_1V;
	u32 OSTRIDE;
	u32 YRGB_VPH;
	u32 UV_VPH;
	u32 HORZ_PH;
	u32 INIT_PHS;
	u32 DWINPOS;
	u32 DWINSZ;
	u32 SWIDTH;
	u32 SWIDTHSW;
	u32 SHEIGHT;
	u32 YRGBSCALE;
	u32 UVSCALE;
	u32 OCLRC0;
	u32 OCLRC1;
	u32 DCLRKV;
	u32 DCLRKM;
	u32 SCLRKVH;
	u32 SCLRKVL;
	u32 SCLRKEN;
	u32 OCONFIG;
	u32 OCMD;
	u32 RESERVED1; /* 0x6C */
	u32 OSTART_0Y;
	u32 OSTART_1Y;
	u32 OSTART_0U;
	u32 OSTART_0V;
	u32 OSTART_1U;
	u32 OSTART_1V;
	u32 OTILEOFF_0Y;
	u32 OTILEOFF_1Y;
	u32 OTILEOFF_0U;
	u32 OTILEOFF_0V;
	u32 OTILEOFF_1U;
	u32 OTILEOFF_1V;
	u32 FASTHSCALE; /* 0xA0 */
	u32 UVSCALEV; /* 0xA4 */
	u32 RESERVEDC[(0x200 - 0xA8) / 4]; /* 0xA8 - 0x1FC */
	u16 Y_VCOEFS[N_VERT_Y_TAPS * N_PHASES]; /* 0x200 */
	u16 RESERVEDD[0x100 / 2 - N_VERT_Y_TAPS * N_PHASES];
	u16 Y_HCOEFS[N_HORIZ_Y_TAPS * N_PHASES]; /* 0x300 */
	u16 RESERVEDE[0x200 / 2 - N_HORIZ_Y_TAPS * N_PHASES];
	u16 UV_VCOEFS[N_VERT_UV_TAPS * N_PHASES]; /* 0x500 */
	u16 RESERVEDF[0x100 / 2 - N_VERT_UV_TAPS * N_PHASES];
	u16 UV_HCOEFS[N_HORIZ_UV_TAPS * N_PHASES]; /* 0x600 */
	u16 RESERVEDG[0x100 / 2 - N_HORIZ_UV_TAPS * N_PHASES];
};

struct intel_overlay {
	struct intel_display *display;
	struct intel_crtc *crtc;
	bool pfit_active;
	u32 pfit_vscale_ratio; /* shifted-point number, (1<<12) == 1.0 */
	u32 color_key:24;
	u32 color_key_enabled:1;
	u32 brightness, contrast, saturation;
	u32 old_xscale, old_yscale;
	struct overlay_registers __iomem *regs;
};

void intel_overlay_reset(struct intel_display *display)
{
	struct intel_overlay *overlay = display->overlay;

	if (!overlay)
		return;

	overlay->old_xscale = 0;
	overlay->old_yscale = 0;
	overlay->crtc = NULL;

	intel_parent_overlay_reset(display);
}

static int packed_depth_bytes(u32 format)
{
	switch (format & I915_OVERLAY_DEPTH_MASK) {
	case I915_OVERLAY_YUV422:
		return 4;
	case I915_OVERLAY_YUV411:
		/* return 6; not implemented */
	default:
		return -EINVAL;
	}

Annotation

Implementation Notes