drivers/gpu/drm/nouveau/nvkm/subdev/therm/g84.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/therm/g84.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/therm/g84.c
Extension
.c
Size
7362 bytes
Lines
248
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 "priv.h"

#include <subdev/fuse.h>

int
g84_temp_get(struct nvkm_therm *therm)
{
	struct nvkm_device *device = therm->subdev.device;

	if (nvkm_fuse_read(device->fuse, 0x1a8) == 1)
		return nvkm_rd32(device, 0x20400);
	else
		return -ENODEV;
}

void
g84_sensor_setup(struct nvkm_therm *therm)
{
	struct nvkm_device *device = therm->subdev.device;

	/* enable temperature reading for cards with insane defaults */
	if (nvkm_fuse_read(device->fuse, 0x1a8) == 1) {
		nvkm_mask(device, 0x20008, 0x80008000, 0x80000000);
		nvkm_mask(device, 0x2000c, 0x80000003, 0x00000000);
		mdelay(20); /* wait for the temperature to stabilize */
	}
}

static void
g84_therm_program_alarms(struct nvkm_therm *therm)
{
	struct nvbios_therm_sensor *sensor = &therm->bios_sensor;
	struct nvkm_subdev *subdev = &therm->subdev;
	struct nvkm_device *device = subdev->device;
	unsigned long flags;

	spin_lock_irqsave(&therm->sensor.alarm_program_lock, flags);

	/* enable RISING and FALLING IRQs for shutdown, THRS 0, 1, 2 and 4 */
	nvkm_wr32(device, 0x20000, 0x000003ff);

	/* shutdown: The computer should be shutdown when reached */
	nvkm_wr32(device, 0x20484, sensor->thrs_shutdown.hysteresis);
	nvkm_wr32(device, 0x20480, sensor->thrs_shutdown.temp);

	/* THRS_1 : fan boost*/
	nvkm_wr32(device, 0x204c4, sensor->thrs_fan_boost.temp);

	/* THRS_2 : critical */
	nvkm_wr32(device, 0x204c0, sensor->thrs_critical.temp);

	/* THRS_4 : down clock */
	nvkm_wr32(device, 0x20414, sensor->thrs_down_clock.temp);
	spin_unlock_irqrestore(&therm->sensor.alarm_program_lock, flags);

	nvkm_debug(subdev,
		   "Programmed thresholds [ %d(%d), %d(%d), %d(%d), %d(%d) ]\n",
		   sensor->thrs_fan_boost.temp,
		   sensor->thrs_fan_boost.hysteresis,
		   sensor->thrs_down_clock.temp,
		   sensor->thrs_down_clock.hysteresis,
		   sensor->thrs_critical.temp,
		   sensor->thrs_critical.hysteresis,
		   sensor->thrs_shutdown.temp,
		   sensor->thrs_shutdown.hysteresis);

}

/* must be called with alarm_program_lock taken ! */
static void
g84_therm_threshold_hyst_emulation(struct nvkm_therm *therm,
				   uint32_t thrs_reg, u8 status_bit,
				   const struct nvbios_therm_threshold *thrs,
				   enum nvkm_therm_thrs thrs_name)
{
	struct nvkm_device *device = therm->subdev.device;
	enum nvkm_therm_thrs_direction direction;
	enum nvkm_therm_thrs_state prev_state, new_state;
	int temp, cur;

	prev_state = nvkm_therm_sensor_get_threshold_state(therm, thrs_name);
	temp = nvkm_rd32(device, thrs_reg);

	/* program the next threshold */
	if (temp == thrs->temp) {
		nvkm_wr32(device, thrs_reg, thrs->temp - thrs->hysteresis);
		new_state = NVKM_THERM_THRS_HIGHER;
	} else {
		nvkm_wr32(device, thrs_reg, thrs->temp);
		new_state = NVKM_THERM_THRS_LOWER;

Annotation

Implementation Notes