drivers/gpu/drm/amd/display/dc/link/protocols/link_hpd.h

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/amd/display/dc/link/protocols/link_hpd.h

Extension

.h

Size

2020 bytes

Lines

54

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

• link_service.h

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

#ifndef __DC_LINK_HPD_H__
#define __DC_LINK_HPD_H__
#include "link_service.h"

enum hpd_source_id get_hpd_line(struct dc_link *link);
/*
 *  Function: program_hpd_filter
 *
 *  @brief
 *     Programs HPD filter on associated HPD line to default values.
 *
 *  @return
 *     true on success, false otherwise
 */
bool program_hpd_filter(const struct dc_link *link);
/* Query hot plug status of USB4 DP tunnel.
 * Returns true if HPD high.
 */
bool dpia_query_hpd_status(struct dc_link *link);
bool link_get_hpd_state(struct dc_link *link);
struct gpio *link_get_hpd_gpio(struct dc_bios *dcb,
		struct graphics_object_id link_id,
		struct gpio_service *gpio_service);
void link_enable_hpd(const struct dc_link *link);
void link_disable_hpd(const struct dc_link *link);
void link_enable_hpd_filter(struct dc_link *link, bool enable);
#endif /* __DC_LINK_HPD_H__ */

Annotation

• Immediate include surface: `link_service.h`.
• 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.