drivers/gpu/drm/amd/display/dc/gpio/hw_hpd.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/amd/display/dc/gpio/hw_hpd.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/amd/display/dc/gpio/hw_hpd.c
Extension
.c
Size
3670 bytes
Lines
150
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

#include "dm_services.h"

#include "include/gpio_interface.h"
#include "include/gpio_types.h"
#include "hw_gpio.h"
#include "hw_hpd.h"

#include "reg_helper.h"
#include "hpd_regs.h"

#undef FN
#define FN(reg_name, field_name) \
	gpio_reg_shift(hpd->shifts->field_name), hpd->masks->field_name

#define CTX \
	hpd->base.base.ctx
#define REG(reg)\
	(hpd->regs->reg)

struct gpio;

static void dal_hw_hpd_destruct(
	struct hw_hpd *pin)
{
	dal_hw_gpio_destruct(&pin->base);
}

static void dal_hw_hpd_destroy(
	struct hw_gpio_pin **ptr)
{
	struct hw_hpd *hpd = HW_HPD_FROM_BASE(*ptr);

	dal_hw_hpd_destruct(hpd);

	kfree(hpd);

	*ptr = NULL;
}

static enum gpio_result dal_hw_hpd_get_value(
	const struct hw_gpio_pin *ptr,
	uint32_t *value)
{
	struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);
	uint32_t hpd_delayed = 0;

	/* in Interrupt mode we ask for SENSE bit */

	if (ptr->mode == GPIO_MODE_INTERRUPT) {

		REG_GET(int_status,
			DC_HPD_SENSE_DELAYED, &hpd_delayed);

		*value = hpd_delayed;
		return GPIO_RESULT_OK;
	}

	/* in any other modes, operate as normal GPIO */

	return dal_hw_gpio_get_value(ptr, value);
}

static enum gpio_result dal_hw_hpd_set_config(
	struct hw_gpio_pin *ptr,
	const struct gpio_config_data *config_data)
{
	struct hw_hpd *hpd = HW_HPD_FROM_BASE(ptr);

	if (!config_data)
		return GPIO_RESULT_INVALID_DATA;

	REG_UPDATE_2(toggle_filt_cntl,
		DC_HPD_CONNECT_INT_DELAY, config_data->config.hpd.delay_on_connect / 10,
		DC_HPD_DISCONNECT_INT_DELAY, config_data->config.hpd.delay_on_disconnect / 10);

	return GPIO_RESULT_OK;
}

static const struct hw_gpio_pin_funcs funcs = {
	.destroy = dal_hw_hpd_destroy,
	.open = dal_hw_gpio_open,
	.get_value = dal_hw_hpd_get_value,
	.set_value = dal_hw_gpio_set_value,
	.set_config = dal_hw_hpd_set_config,
	.change_mode = dal_hw_gpio_change_mode,
	.close = dal_hw_gpio_close,
};

static void dal_hw_hpd_construct(
	struct hw_hpd *pin,

Annotation

Implementation Notes