diff options
Diffstat (limited to 'drivers/acpi/reboot.c')
| -rw-r--r-- | drivers/acpi/reboot.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/acpi/reboot.c b/drivers/acpi/reboot.c index ca707f5b521d..b79b7c99c237 100644 --- a/drivers/acpi/reboot.c +++ b/drivers/acpi/reboot.c @@ -1,8 +1,11 @@ // SPDX-License-Identifier: GPL-2.0 +#define pr_fmt(fmt) "ACPI: " fmt + #include <linux/pci.h> #include <linux/acpi.h> #include <acpi/reboot.h> +#include <linux/delay.h> #ifdef CONFIG_PCI static void acpi_pci_reboot(struct acpi_generic_address *rr, u8 reset_value) @@ -62,8 +65,18 @@ void acpi_reboot(void) case ACPI_ADR_SPACE_SYSTEM_MEMORY: case ACPI_ADR_SPACE_SYSTEM_IO: - printk(KERN_DEBUG "ACPI MEMORY or I/O RESET_REG.\n"); + pr_debug("ACPI MEMORY or I/O RESET_REG.\n"); acpi_reset(); break; } + + /* + * Some platforms do not shut down immediately after writing to the + * ACPI reset register, and this results in racing with the + * subsequent reboot mechanism. + * + * The 15ms delay has been found to be long enough for the system + * to reboot on the affected platforms. + */ + mdelay(15); } |