drivers/gpu/drm/i915/display/intel_de.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/i915/display/intel_de.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/i915/display/intel_de.c
Extension
.c
Size
4597 bytes
Lines
187
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

if ((reg_value & mask) == value) {
			ret = 0;
			break;
		}

		if (expired) {
			ret = -ETIMEDOUT;
			break;
		}

		if (is_atomic)
			udelay(wait);
		else
			usleep_range(wait, wait << 1);

		if (wait < wait_max)
			wait <<= 1;
	}

	if (out_val)
		*out_val = reg_value;

	return ret;
}

static int intel_de_wait_for_register(struct intel_display *display,
				      intel_reg_t reg, u32 mask, u32 value,
				      unsigned int fast_timeout_us,
				      unsigned int slow_timeout_us,
				      u32 (*read)(struct intel_display *display, intel_reg_t reg),
				      u32 *out_value, bool is_atomic)
{
	int ret = -EINVAL;

	if (fast_timeout_us)
		ret = __intel_de_wait_for_register(display, reg, mask, value,
						   fast_timeout_us, read,
						   out_value, is_atomic);

	if (ret && slow_timeout_us)
		ret = __intel_de_wait_for_register(display, reg, mask, value,
						   slow_timeout_us, read,
						   out_value, is_atomic);

	return ret;
}

int intel_de_wait_us(struct intel_display *display, intel_reg_t reg,
		     u32 mask, u32 value, unsigned int timeout_us,
		     u32 *out_value)
{
	int ret;

	intel_dmc_wl_get(display, reg);

	ret = intel_de_wait_for_register(display, reg, mask, value,
					 timeout_us, 0,
					 intel_de_read,
					 out_value, false);

	intel_dmc_wl_put(display, reg);

	return ret;
}

int intel_de_wait_ms(struct intel_display *display, intel_reg_t reg,
		     u32 mask, u32 value, unsigned int timeout_ms,
		     u32 *out_value)
{
	int ret;

	intel_dmc_wl_get(display, reg);

	ret = intel_de_wait_for_register(display, reg, mask, value,
					 2, timeout_ms * 1000,
					 intel_de_read,
					 out_value, false);

	intel_dmc_wl_put(display, reg);

	return ret;
}

int intel_de_wait_fw_ms(struct intel_display *display, intel_reg_t reg,
			u32 mask, u32 value, unsigned int timeout_ms,
			u32 *out_value)
{
	return intel_de_wait_for_register(display, reg, mask, value,
					  2, timeout_ms * 1000,
					  intel_de_read_fw,

Annotation

Implementation Notes