| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <acpi/acpi.h> |
| #include <acpi/acpigen.h> |
| #include <baseboard/variants.h> |
| #include <delay.h> |
| #include <gpio.h> |
| #include <timer.h> |
| #include <types.h> |
| |
| #define GPU_1V8_PWR_EN GPP_E18 |
| #define GPU_1V8_PG GPP_E20 |
| #define NV33_PWR_EN GPP_A21 |
| #define NV33_PG GPP_A22 |
| #define NVVDD_PWR_EN GPP_E0 |
| #define NVVDD_PG GPP_E16 |
| #define PEXVDD_PWR_EN GPP_E10 |
| #define PEXVDD_PG GPP_E17 |
| #define FBVDD_PWR_EN GPP_A17 |
| #define FBVDD_PG GPP_E4 |
| #define GPU_PERST_L GPP_B3 |
| #define GPU_ALLRAILS_PG GPP_E5 |
| |
| #define DEFAULT_PG_TIMEOUT_US 20000 |
| |
| #define VGAR_BYTE_OFFSET 5 |
| |
| /* Maximum size of PCI config space to save. */ |
| #define GPU_CONFIG_SAVE_SPACE_BYTES 0x100 |
| |
| static bool gpu_powered_on; |
| |
| struct power_rail_sequence { |
| const char *name; |
| |
| /* This is the GPIO (output) connected to the VR's enable pin. */ |
| gpio_t pwr_en_gpio; |
| bool pwr_en_active_low; |
| |
| /* This is the GPIO (input) connected to the VR's power-good pin. */ |
| gpio_t pg_gpio; |
| }; |
| |
| /* In GCOFF exit order (i.e., power-on order) */ |
| static const struct power_rail_sequence gpu_rails[] = { |
| { "GPU 1.8V", GPU_1V8_PWR_EN, false, GPU_1V8_PG, }, |
| { "NV3_3", NV33_PWR_EN, false, NV33_PG, }, |
| { "NVVDD+MSVDD", NVVDD_PWR_EN, true, NVVDD_PG, }, |
| { "PEXVDD", PEXVDD_PWR_EN, false, PEXVDD_PG, }, |
| { "FBVDD", FBVDD_PWR_EN, false, FBVDD_PG, }, |
| }; |
| |
| enum rail_state { |
| RAIL_OFF = 0, |
| RAIL_ON = 1, |
| }; |
| |
| /* Assert the VR's enable pin, and wait until the VR's power-good is asserted. */ |
| static bool sequence_rail(const struct power_rail_sequence *seq, enum rail_state state) |
| { |
| if (seq->pwr_en_active_low) |
| state = !state; |
| |
| gpio_output(seq->pwr_en_gpio, state); |
| return wait_us(DEFAULT_PG_TIMEOUT_US, gpio_get(seq->pg_gpio) == state) > 0; |
| } |
| |
| static void dgpu_power_sequence_off(void) |
| { |
| /* Assert reset and clear power-good */ |
| gpio_output(GPU_PERST_L, 0); |
| mdelay(5); |
| |
| /* Inform the GPU that the power is no longer good. */ |
| gpio_output(GPU_ALLRAILS_PG, 0); |
| |
| for (int i = (int)ARRAY_SIZE(gpu_rails) - 1; i >= 0; i--) { |
| if (!sequence_rail(&gpu_rails[i], RAIL_OFF)) { |
| printk(BIOS_ERR, "Failed to disable %s rail, continuing!\n", |
| gpu_rails[i].name); |
| } |
| } |
| } |
| |
| static void dgpu_power_sequence_on(void) |
| { |
| /* Assert PERST# */ |
| gpio_output(GPU_PERST_L, 0); |
| |
| for (size_t i = 0; i < ARRAY_SIZE(gpu_rails); i++) { |
| if (!sequence_rail(&gpu_rails[i], RAIL_ON)) { |
| printk(BIOS_ERR, "Failed to enable %s rail, sequencing back down!\n", |
| gpu_rails[i].name); |
| |
| /* If an error occurred, then perform the power-off sequence and |
| return early to avoid setting GPU_ALLRAILS_PG and PERST_L. */ |
| dgpu_power_sequence_off(); |
| return; |
| } |
| } |
| |
| /* Set power-good and release PERST# */ |
| gpio_output(GPU_ALLRAILS_PG, 1); |
| mdelay(1); |
| gpio_output(GPU_PERST_L, 1); |
| |
| printk(BIOS_INFO, "Sequenced GPU successfully\n"); |
| gpu_powered_on = true; |
| } |
| |
| void variant_init(void) |
| { |
| if (acpi_is_wakeup_s3()) |
| return; |
| |
| dgpu_power_sequence_on(); |
| } |
| |
| void variant_finalize(void) |
| { |
| if (acpi_is_wakeup_s3() || !gpu_powered_on) |
| return; |
| |
| /* |
| * Because the dGPU is used here in a way similar to "hybrid graphics" |
| * modes, it is powered down here. The DRIVERS_GFX_NVIDIA_SAVE_BARS |
| * option is selected for agah, so the BARs will be saved to ACPI memory |
| * during its finalize routine. Thus, it is powered down here, as the |
| * proper resources have already been allocated. |
| */ |
| dgpu_power_sequence_off(); |
| |
| printk(BIOS_INFO, "GPU power sequenced off.\n"); |
| } |
| |
| /* Save PCI BARs to the ACPI copy of the "saved PCI config space" */ |
| void variant_fill_ssdt(const struct device *unused) |
| { |
| if (!gpu_powered_on) |
| return; |
| |
| const struct device *dgpu = DEV_PTR(dgpu); |
| acpigen_write_scope("\\_SB.PCI0.PEG0.PEGP"); |
| acpigen_write_method("_INI", 0); |
| { |
| /* Local0 = VGAR */ |
| acpigen_write_store(); |
| acpigen_emit_namestring("VGAR"); |
| acpigen_emit_byte(LOCAL0_OP); |
| |
| /* |
| * CreateDWordField(Local0, 11, BAR0) |
| * BAR0 = bases[0] |
| * CreateDWordField(Local0, 15, BAR1) |
| * BAR1 = bases[1] |
| * ... |
| */ |
| for (unsigned int idx = PCI_BASE_ADDRESS_0, i = 0; idx <= PCI_BASE_ADDRESS_5; |
| idx += sizeof(uint32_t), ++i) { |
| char name[ACPI_NAME_BUFFER_SIZE]; |
| const struct resource *res; |
| |
| res = probe_resource(dgpu, idx); |
| if (!res) |
| continue; |
| |
| snprintf(name, sizeof(name), "BAR%1d", i); |
| acpigen_write_create_dword_field(LOCAL0_OP, idx - VGAR_BYTE_OFFSET, |
| name); |
| acpigen_write_store_int_to_namestr(res->base & 0xffffffff, name); |
| } |
| |
| /* VGAR = Local0 */ |
| acpigen_write_store_op_to_namestr(LOCAL0_OP, "VGAR"); |
| } |
| |
| acpigen_write_method_end(); |
| acpigen_write_scope_end(); |
| } |