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platform/x86: x86-android-tablets: Workaround Lenovo Yoga Tablet 2 830/1050 poweroff hang

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These tablets' DSDT does not set acpi_gbl_reduced_hardware, so
acpi_power_off gets used as pm_power_off handler. Not setting
acpi_gbl_reduced_hardware may very well be correct for these tablets,
but acpi_power_off is broken on them.

Using acpi_power_off causes "poweroff" to hang hard. Requiring pressing
the powerbutton for 30 seconds *twice* followed by a normal 3 second
press to recover.

Avoid this by overriding the global pm_power_off handler to do
an EFI poweroff, which does work, instead.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20220223133153.730337-5-hdegoede@redhat.com
This commit is contained in:
Hans de Goede 2022-02-23 14:31:52 +01:00
parent 67dfc2b441
commit bf8fd1a973
1 changed files with 21 additions and 0 deletions
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21
drivers/platform/x86/x86-android-tablets.c
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@ -12,6 +12,7 @@
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/efi.h>
#include <linux/gpio_keys.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.h>
@ -24,6 +25,7 @@
#include <linux/mod_devicetable.h>
#include <linux/platform_data/lp855x.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/power/bq24190_charger.h>
#include <linux/rmi.h>
#include <linux/serdev.h>
@ -817,6 +819,7 @@ static struct x86_dev_info lenovo_yoga_tab2_830_1050_info __initdata = {
.modules = bq24190_modules,
.invalid_aei_gpiochip = "INT33FC:02",
.init = lenovo_yoga_tab2_830_1050_init,
.exit = lenovo_yoga_tab2_830_1050_exit,
};
/*
@ -863,6 +866,18 @@ static int __init lenovo_yoga_tab2_830_1050_init_display(void)
return 0;
}
/*
* These tablet's DSDT does not set acpi_gbl_reduced_hardware, so acpi_power_off
* gets used as pm_power_off handler. This causes "poweroff" on these tablets
* to hang hard. Requiring pressing the powerbutton for 30 seconds *twice*
* followed by a normal 3 second press to recover. Avoid this by doing an EFI
* poweroff instead.
*/
static void lenovo_yoga_tab2_830_1050_power_off(void)
{
efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
}
static int __init lenovo_yoga_tab2_830_1050_init(void)
{
int ret;
@ -871,9 +886,15 @@ static int __init lenovo_yoga_tab2_830_1050_init(void)
if (ret)
return ret;
pm_power_off = lenovo_yoga_tab2_830_1050_power_off;
return 0;
}
static void lenovo_yoga_tab2_830_1050_exit(void)
{
pm_power_off = NULL; /* Just turn poweroff into halt on module unload */
}
/* Nextbook Ares 8 tablets have an Android factory img with everything hardcoded */
static const char * const nextbook_ares8_accel_mount_matrix[] = {
"0", "-1", "0",