drm/nouveau/bios/volt: add support for pwm-based volt management (7bddeba9) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/volt.h

+14 −1

Original line number	Diff line number	Diff line
		#ifndef __NVBIOS_VOLT_H__
		#define __NVBIOS_VOLT_H__

		enum nvbios_volt_type {
		NVBIOS_VOLT_GPIO = 0,
		NVBIOS_VOLT_PWM,
		};

		struct nvbios_volt {
		u8 vidmask;
		enum nvbios_volt_type type;
		u32 min;
		u32 max;
		u32 base;

		/* GPIO mode */
		u8 vidmask;
		s16 step;

		/* PWM mode */
		u32 pwm_freq;
		u32 pwm_range;
		};

		u16 nvbios_volt_table(struct nvkm_bios , u8 ver, u8 hdr, u8 cnt, u8 *len);

+15 −2

Original line number	Diff line number	Diff line
		@@ -73,15 +73,19 @@ nvbios_volt_parse(struct nvkm_bios bios, u8 ver, u8 hdr, u8 cnt, u8 *len,
		memset(info, 0x00, sizeof(*info));
		switch (!!volt * *ver) {
		case 0x12:
		info->type = NVBIOS_VOLT_GPIO;
		info->vidmask = nvbios_rd08(bios, volt + 0x04);
		break;
		case 0x20:
		info->type = NVBIOS_VOLT_GPIO;
		info->vidmask = nvbios_rd08(bios, volt + 0x05);
		break;
		case 0x30:
		info->type = NVBIOS_VOLT_GPIO;
		info->vidmask = nvbios_rd08(bios, volt + 0x04);
		break;
		case 0x40:
		info->type = NVBIOS_VOLT_GPIO;
		info->base = nvbios_rd32(bios, volt + 0x04);
		info->step = nvbios_rd16(bios, volt + 0x08);
		info->vidmask = nvbios_rd08(bios, volt + 0x0b);
		@@ -90,11 +94,20 @@ nvbios_volt_parse(struct nvkm_bios bios, u8 ver, u8 hdr, u8 cnt, u8 *len,
		info->max = info->base;
		break;
		case 0x50:
		info->vidmask = nvbios_rd08(bios, volt + 0x06);
		info->min = nvbios_rd32(bios, volt + 0x0a);
		info->max = nvbios_rd32(bios, volt + 0x0e);
		info->base = nvbios_rd32(bios, volt + 0x12) & 0x00ffffff;

		/* offset 4 seems to be a flag byte */
		if (nvbios_rd32(bios, volt + 0x4) & 1) {
		info->type = NVBIOS_VOLT_PWM;
		info->pwm_freq = nvbios_rd32(bios, volt + 0x5) / 1000;
		info->pwm_range = nvbios_rd32(bios, volt + 0x16);
		} else {
		info->type = NVBIOS_VOLT_GPIO;
		info->vidmask = nvbios_rd08(bios, volt + 0x06);
		info->step = nvbios_rd16(bios, volt + 0x16);
		}
		break;
		}
		return volt;