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

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.h

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.h
Extension
.h
Size
3373 bytes
Lines
113
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 usb4_router_validation_set {
	bool is_valid;
	uint8_t cm_id;
	uint8_t dpia_count;
	uint32_t required_bw;
	uint32_t allocated_bw;
	uint32_t estimated_bw;
	uint32_t remaining_bw;
};

/*
 * Enable USB4 DP BW allocation mode
 *
 * @link: pointer to the dc_link struct instance
 *
 * return: SUCCESS or FAILURE
 */
bool link_dpia_enable_usb4_dp_bw_alloc_mode(struct dc_link *link);

/*
 * Allocates only what the stream needs for bw, so if:
 * If (stream_req_bw < or > already_allocated_bw_at_HPD)
 * => Deallocate Max Bw & then allocate only what the stream needs
 *
 * @link: pointer to the dc_link struct instance
 * @req_bw: Bw requested by the stream
 *
 */
void link_dp_dpia_allocate_usb4_bandwidth_for_stream(struct dc_link *link, int req_bw);

/*
 * Handle the USB4 BW Allocation related functionality here:
 * Plug => Try to allocate max bw from timing parameters supported by the sink
 * Unplug => de-allocate bw
 *
 * @link: pointer to the dc_link struct instance
 * @peak_bw: Peak bw used by the link/sink
 *
 */
void dpia_handle_usb4_bandwidth_allocation_for_link(struct dc_link *link, int peak_bw);

/*
 * Obtain all the DP overheads in dp tunneling for the dpia link
 *
 * @link: pointer to the dc_link struct instance
 *
 * return: DP overheads in DP tunneling
 */
uint32_t link_dpia_get_dp_overhead(const struct dc_link *link);

/*
 * Handle DP BW allocation status register
 *
 * @link: pointer to the dc_link struct instance
 * @status: content of DP tunneling status register
 *
 * return: none
 */
void link_dp_dpia_handle_bw_alloc_status(struct dc_link *link, uint8_t status);

/*
 * Aggregates the DPIA bandwidth usage for the respective USB4 Router.
 *
 * @dc_validation_dpia_set: pointer to the dc_validation_dpia_set
 * @count: number of DPIA validation sets
 *
 * return: true if validation is succeeded
 */
bool link_dpia_validate_dp_tunnel_bandwidth(const struct dc_validation_dpia_set *dpia_link_sets, uint8_t count);

#endif /* DC_INC_LINK_DP_DPIA_BW_H_ */

Annotation

Implementation Notes