drivers/gpu/drm/lima/lima_pmu.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/lima/lima_pmu.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/lima/lima_pmu.c
Extension
.c
Size
2680 bytes
Lines
133
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 (dev->ip[i].present) {
				ret |= LIMA450_PMU_POWER_PP13_MASK;
				break;
			}
		}
		for (i = lima_ip_pp4; i <= lima_ip_pp7; i++) {
			if (dev->ip[i].present) {
				ret |= LIMA450_PMU_POWER_PP47_MASK;
				break;
			}
		}
	}

	return ret;
}

static int lima_pmu_hw_init(struct lima_ip *ip)
{
	int err;
	u32 stat;

	pmu_write(LIMA_PMU_INT_MASK, 0);

	/* If this value is too low, when in high GPU clk freq,
	 * GPU will be in unstable state.
	 */
	pmu_write(LIMA_PMU_SW_DELAY, 0xffff);

	/* status reg 1=off 0=on */
	stat = pmu_read(LIMA_PMU_STATUS);

	/* power up all ip */
	if (stat) {
		pmu_write(LIMA_PMU_POWER_UP, stat);
		err = lima_pmu_wait_cmd(ip);
		if (err)
			return err;
	}
	return 0;
}

static void lima_pmu_hw_fini(struct lima_ip *ip)
{
	u32 stat;

	if (!ip->data.mask)
		ip->data.mask = lima_pmu_get_ip_mask(ip);

	stat = ~pmu_read(LIMA_PMU_STATUS) & ip->data.mask;
	if (stat) {
		pmu_write(LIMA_PMU_POWER_DOWN, stat);

		/* Don't wait for interrupt on Mali400 if all domains are
		 * powered off because the HW won't generate an interrupt
		 * in this case.
		 */
		if (ip->dev->id == lima_gpu_mali400)
			pmu_write(LIMA_PMU_INT_CLEAR, LIMA_PMU_INT_CMD_MASK);
		else
			lima_pmu_wait_cmd(ip);
	}
}

int lima_pmu_resume(struct lima_ip *ip)
{
	return lima_pmu_hw_init(ip);
}

void lima_pmu_suspend(struct lima_ip *ip)
{
	lima_pmu_hw_fini(ip);
}

int lima_pmu_init(struct lima_ip *ip)
{
	return lima_pmu_hw_init(ip);
}

void lima_pmu_fini(struct lima_ip *ip)
{
	lima_pmu_hw_fini(ip);
}

Annotation

Implementation Notes