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

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

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/amd/display/dc/link/protocols/link_ddc.h
Extension
.h
Size
3769 bytes
Lines
111
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

#ifndef __DAL_DDC_SERVICE_H__
#define __DAL_DDC_SERVICE_H__

#include "link_service.h"

#define AUX_POWER_UP_WA_DELAY 500
#define I2C_OVER_AUX_DEFER_WA_DELAY 70
#define DPVGA_DONGLE_AUX_DEFER_WA_DELAY 40
#define I2C_OVER_AUX_DEFER_WA_DELAY_1MS 1
#define LINK_AUX_DEFAULT_LTTPR_TIMEOUT_PERIOD 3200 /*us*/
#define LINK_AUX_DEFAULT_TIMEOUT_PERIOD 552 /*us*/

#define EDID_SEGMENT_SIZE 256

struct ddc_service *link_create_ddc_service(
		struct ddc_service_init_data *ddc_init_data);

void link_destroy_ddc_service(struct ddc_service **ddc);

void set_ddc_transaction_type(
		struct ddc_service *ddc,
		enum ddc_transaction_type type);

uint32_t link_get_aux_defer_delay(struct ddc_service *ddc);

bool link_is_in_aux_transaction_mode(struct ddc_service *ddc);

bool try_to_configure_aux_timeout(struct ddc_service *ddc,
		uint32_t timeout);

bool link_query_ddc_data(
		struct ddc_service *ddc,
		uint32_t address,
		uint8_t *write_buf,
		uint32_t write_size,
		uint8_t *read_buf,
		uint32_t read_size);

/* Attempt to submit an aux payload, retrying on timeouts, defers, and busy
 * states as outlined in the DP spec.  Returns true if the request was
 * successful.
 *
 * NOTE: The function requires explicit mutex on DM side in order to prevent
 * potential race condition. DC components should call the dpcd read/write
 * function in dm_helpers in order to access dpcd safely
 */
bool link_aux_transfer_with_retries_no_mutex(struct ddc_service *ddc,
		struct aux_payload *payload);

bool link_configure_fixed_vs_pe_retimer(
		struct ddc_service *ddc,
		const uint8_t *data,
		uint32_t length);

bool link_query_fixed_vs_pe_retimer(
		struct ddc_service *ddc,
		uint8_t *data,
		uint32_t length);

uint32_t link_get_fixed_vs_pe_retimer_read_address(struct dc_link *link);
uint32_t link_get_fixed_vs_pe_retimer_write_address(struct dc_link *link);


void write_scdc_data(
		struct ddc_service *ddc_service,
		uint32_t pix_clk,
		bool lte_340_scramble);

void read_scdc_data(
		struct ddc_service *ddc_service);

void write_idcc_data(struct ddc_service *ddc_service, enum hdmi_idcc_scope idcc_scope,
		uint8_t *write_buf, uint8_t offset, uint8_t write_len);
int read_idcc_data(struct ddc_service *ddc_service, enum hdmi_idcc_scope idcc_scope,
		uint8_t *read_buf, uint8_t offset, uint8_t read_len);
void set_dongle_type(struct ddc_service *ddc,
		enum display_dongle_type dongle_type);

struct ddc *get_ddc_pin(struct ddc_service *ddc_service);

int link_aux_transfer_raw(struct ddc_service *ddc,
		struct aux_payload *payload,
		enum aux_return_code_type *operation_result);
#endif /* __DAL_DDC_SERVICE_H__ */

Annotation

Implementation Notes