mirror of
https://github.com/theupriser/steamify-cachyos.git
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81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Steam Machine (Fremont): power off instead of booting up again.
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*
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* Since "pinctrl-amd: Don't clear S4 wake bits at probe" (Linux 7.2, also
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* backported to 6.x, 7.0 and 7.1 updates) the S4/S5 wake bit the firmware
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* leaves set on GPIO pin 18 (_SB.PCI0.GPP6) stays set, and the machine starts again right after powering off.
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* Valve's kernel clears that bit at probe on Fremont (not for upstream);
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* this does the same right before power-off, for kernels without it.
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*/
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#include <linux/acpi.h>
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#include <linux/bits.h>
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#include <linux/dmi.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/reboot.h>
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#define FREMONT_GPP6_PIN 18
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#define WAKE_CNTRL_OFF_S4 15
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static void __iomem *pin_reg;
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static struct sys_off_handler *handler;
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static int fremont_poweroff_prepare(struct sys_off_data *data)
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{
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u32 v = readl(pin_reg);
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if (v & BIT(WAKE_CNTRL_OFF_S4))
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writel(v & ~BIT(WAKE_CNTRL_OFF_S4), pin_reg);
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return NOTIFY_DONE;
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}
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static int __init fremont_poweroff_init(void)
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{
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struct acpi_device *adev;
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struct device *dev;
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struct resource *res;
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u32 v;
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if (!dmi_match(DMI_BOARD_NAME, "Fremont"))
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return -ENODEV;
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adev = acpi_dev_get_first_match_dev("AMDI0030", NULL, -1);
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if (!adev)
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return -ENODEV;
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dev = bus_find_device_by_acpi_dev(&platform_bus_type, adev);
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acpi_dev_put(adev);
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if (!dev)
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return -ENODEV;
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res = platform_get_resource(to_platform_device(dev), IORESOURCE_MEM, 0);
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put_device(dev);
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if (!res || resource_size(res) < (FREMONT_GPP6_PIN + 1) * 4)
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return -ENODEV;
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/* pinctrl-amd owns the region; only this one register is touched. */
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pin_reg = ioremap(res->start + FREMONT_GPP6_PIN * 4, 4);
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if (!pin_reg)
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return -ENOMEM;
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v = readl(pin_reg);
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pr_info("GPIO %d register 0x%08x, S4/S5 wake %s\n", FREMONT_GPP6_PIN, v,
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v & BIT(WAKE_CNTRL_OFF_S4) ? "set (cleared at power-off)" : "clear");
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handler = register_sys_off_handler(SYS_OFF_MODE_POWER_OFF_PREPARE,
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SYS_OFF_PRIO_DEFAULT, fremont_poweroff_prepare, NULL);
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if (IS_ERR(handler)) {
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iounmap(pin_reg);
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return PTR_ERR(handler);
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}
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return 0;
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}
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static void __exit fremont_poweroff_exit(void)
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{
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unregister_sys_off_handler(handler);
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iounmap(pin_reg);
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}
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module_init(fremont_poweroff_init);
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module_exit(fremont_poweroff_exit);
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MODULE_DESCRIPTION("Steam Machine: clear GPIO 18's S4 wake bit before power-off");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("dmi:*:rnFremont:*");
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