drivers/gpu/drm/nouveau/nvkm/subdev/volt/gk20a.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/volt/gk20a.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/volt/gk20a.c
Extension
.c
Size
5780 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

#define gk20a_volt(p) container_of((p), struct gk20a_volt, base)
#include "priv.h"

#include <core/tegra.h>

#include "gk20a.h"

static const struct cvb_coef gk20a_cvb_coef[] = {
	/* MHz,        c0,     c1,   c2,    c3,     c4,   c5 */
	/*  72 */ { 1209886, -36468,  515,   417, -13123,  203},
	/* 108 */ { 1130804, -27659,  296,   298, -10834,  221},
	/* 180 */ { 1162871, -27110,  247,   238, -10681,  268},
	/* 252 */ { 1220458, -28654,  247,   179, -10376,  298},
	/* 324 */ { 1280953, -30204,  247,   119,  -9766,  304},
	/* 396 */ { 1344547, -31777,  247,   119,  -8545,  292},
	/* 468 */ { 1420168, -34227,  269,    60,  -7172,  256},
	/* 540 */ { 1490757, -35955,  274,    60,  -5188,  197},
	/* 612 */ { 1599112, -42583,  398,     0,  -1831,  119},
	/* 648 */ { 1366986, -16459, -274,     0,  -3204,   72},
	/* 684 */ { 1391884, -17078, -274,   -60,  -1526,   30},
	/* 708 */ { 1415522, -17497, -274,   -60,   -458,    0},
	/* 756 */ { 1464061, -18331, -274,  -119,   1831,  -72},
	/* 804 */ { 1524225, -20064, -254,  -119,   4272, -155},
	/* 852 */ { 1608418, -21643, -269,     0,    763,  -48},
};

/*
 * cvb_mv = ((c2 * speedo / s_scale + c1) * speedo / s_scale + c0)
 */
static inline int
gk20a_volt_get_cvb_voltage(int speedo, int s_scale, const struct cvb_coef *coef)
{
	int mv;

	mv = DIV_ROUND_CLOSEST(coef->c2 * speedo, s_scale);
	mv = DIV_ROUND_CLOSEST((mv + coef->c1) * speedo, s_scale) + coef->c0;
	return mv;
}

/*
 * cvb_t_mv =
 * ((c2 * speedo / s_scale + c1) * speedo / s_scale + c0) +
 * ((c3 * speedo / s_scale + c4 + c5 * T / t_scale) * T / t_scale)
 */
static inline int
gk20a_volt_get_cvb_t_voltage(int speedo, int temp, int s_scale, int t_scale,
			     const struct cvb_coef *coef)
{
	int cvb_mv, mv;

	cvb_mv = gk20a_volt_get_cvb_voltage(speedo, s_scale, coef);

	mv = DIV_ROUND_CLOSEST(coef->c3 * speedo, s_scale) + coef->c4 +
		DIV_ROUND_CLOSEST(coef->c5 * temp, t_scale);
	mv = DIV_ROUND_CLOSEST(mv * temp, t_scale) + cvb_mv;
	return mv;
}

static int
gk20a_volt_calc_voltage(const struct cvb_coef *coef, int speedo)
{
	static const int v_scale = 1000;
	int mv;

	mv = gk20a_volt_get_cvb_t_voltage(speedo, -10, 100, 10, coef);
	mv = DIV_ROUND_UP(mv, v_scale);

	return mv * 1000;
}

static int
gk20a_volt_vid_get(struct nvkm_volt *base)
{
	struct gk20a_volt *volt = gk20a_volt(base);
	int i, uv;

	uv = regulator_get_voltage(volt->vdd);

	for (i = 0; i < volt->base.vid_nr; i++)
		if (volt->base.vid[i].uv >= uv)
			return i;

	return -EINVAL;
}

static int
gk20a_volt_vid_set(struct nvkm_volt *base, u8 vid)
{
	struct gk20a_volt *volt = gk20a_volt(base);
	struct nvkm_subdev *subdev = &volt->base.subdev;

Annotation

Implementation Notes