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ACPI: watchdog: Allow disabling WDAT at boot

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In case the WDAT interface is broken, give the user an option to
ignore it to let a native driver bind to the watchdog device instead.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jean Delvare 2020-02-06 16:58:45 +01:00 committed by Rafael J. Wysocki
parent bb6d3fb354
commit 3f9e12e0df
2 changed files with 15 additions and 1 deletions
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4
Documentation/admin-guide/kernel-parameters.txt
View File

@ -136,6 +136,10 @@
dynamic table installation which will install SSDT
tables to /sys/firmware/acpi/tables/dynamic.
acpi_no_watchdog [HW,ACPI,WDT]
Ignore the ACPI-based watchdog interface (WDAT) and let
a native driver control the watchdog device instead.
acpi_rsdp= [ACPI,EFI,KEXEC]
Pass the RSDP address to the kernel, mostly used
on machines running EFI runtime service to boot the

12
drivers/acpi/acpi_watchdog.c
View File

@ -55,12 +55,14 @@ static bool acpi_watchdog_uses_rtc(const struct acpi_table_wdat *wdat)
}
#endif
static bool acpi_no_watchdog;
static const struct acpi_table_wdat *acpi_watchdog_get_wdat(void)
{
const struct acpi_table_wdat *wdat = NULL;
acpi_status status;
if (acpi_disabled)
if (acpi_disabled || acpi_no_watchdog)
return NULL;
status = acpi_get_table(ACPI_SIG_WDAT, 0,
@ -88,6 +90,14 @@ bool acpi_has_watchdog(void)
}
EXPORT_SYMBOL_GPL(acpi_has_watchdog);
/* ACPI watchdog can be disabled on boot command line */
static int __init disable_acpi_watchdog(char *str)
{
acpi_no_watchdog = true;
return 1;
}
__setup("acpi_no_watchdog", disable_acpi_watchdog);
void __init acpi_watchdog_init(void)
{
const struct acpi_wdat_entry *entries;