drivers/gpu/drm/panfrost/panfrost_devfreq.h

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/panfrost/panfrost_devfreq.h

Extension

.h

Size

1188 bytes

Lines

46

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/devfreq.h
• linux/spinlock.h
• linux/ktime.h

Detected Declarations

• struct devfreq
• struct thermal_cooling_device
• struct panfrost_device
• struct panfrost_devfreq

Annotated Snippet

struct panfrost_devfreq {
	struct devfreq *devfreq;
	struct thermal_cooling_device *cooling;
	struct devfreq_simple_ondemand_data gov_data;
	bool opp_of_table_added;

	unsigned long current_frequency;
	unsigned long fast_rate;

	ktime_t busy_time;
	ktime_t idle_time;
	ktime_t time_last_update;
	int busy_count;
	/*
	 * Protect busy_time, idle_time, time_last_update and busy_count
	 * because these can be updated concurrently between multiple jobs.
	 */
	spinlock_t lock;
};

int panfrost_devfreq_init(struct panfrost_device *pfdev);
void panfrost_devfreq_fini(struct panfrost_device *pfdev);

void panfrost_devfreq_resume(struct panfrost_device *pfdev);
void panfrost_devfreq_suspend(struct panfrost_device *pfdev);

void panfrost_devfreq_record_busy(struct panfrost_devfreq *devfreq);
void panfrost_devfreq_record_idle(struct panfrost_devfreq *devfreq);

#endif /* __PANFROST_DEVFREQ_H__ */

Annotation

• Immediate include surface: `linux/devfreq.h`, `linux/spinlock.h`, `linux/ktime.h`.
• Detected declarations: `struct devfreq`, `struct thermal_cooling_device`, `struct panfrost_device`, `struct panfrost_devfreq`.
• 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.