drivers/gpu/drm/i915/display/intel_dram.h

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/i915/display/intel_dram.h

Extension

.h

Size

1024 bytes

Lines

44

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.

• 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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/types.h

Detected Declarations

• struct intel_display
• struct dram_info
• enum intel_dram_type

Annotated Snippet

struct dram_info {
	enum intel_dram_type {
		INTEL_DRAM_UNKNOWN,
		INTEL_DRAM_DDR2,
		INTEL_DRAM_DDR3,
		INTEL_DRAM_DDR4,
		INTEL_DRAM_LPDDR3,
		INTEL_DRAM_LPDDR4,
		INTEL_DRAM_DDR5,
		INTEL_DRAM_LPDDR5,
		INTEL_DRAM_GDDR,
		INTEL_DRAM_GDDR_ECC,
		__INTEL_DRAM_TYPE_MAX,
	} type;
	unsigned int fsb_freq;
	unsigned int mem_freq;
	u8 num_channels;
	u8 num_qgv_points;
	u8 num_psf_gv_points;
	bool ecc_impacting_de_bw; /* Only valid from Xe3p_LPD onward. */
	bool symmetric_memory;
	bool has_16gb_dimms;
};

int intel_dram_detect(struct intel_display *display);
unsigned int intel_fsb_freq(struct intel_display *display);
unsigned int intel_mem_freq(struct intel_display *display);
const struct dram_info *intel_dram_info(struct intel_display *display);
const char *intel_dram_type_str(enum intel_dram_type type);

#endif /* __INTEL_DRAM_H__ */

Annotation

• Immediate include surface: `linux/types.h`.
• Detected declarations: `struct intel_display`, `struct dram_info`, `enum intel_dram_type`.
• Atlas domain: Driver Families / drivers/gpu.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.