The CPR3 power resource on the Toshiba Click Mini toggles a GPIO
which is called SISP (for SIS touchscreen power?) on/off.
This CPR3 power resource is not listed in any _PR? lists, let alone
in a _PR0 list for the SIS0817 touchscreen ACPI device which needs it.
Before commit a1224f34d72a ("ACPI: PM: Check states of power resources
during initialization") this was not an issue because since nothing
referenced the CPR3 power resource its state was always
ACPI_POWER_RESOURCE_STATE_UNKNOWN and power resources with this state
get ignored by acpi_turn_off_unused_power_resources().
This clearly is a bug in the DSDT of this device. Add a DMI quirk
to make acpi_turn_off_unused_power_resources() a no-op on this
model to fix the touchscreen no longer working since kernel 5.16 .
This quirk also causes 2 other power resources to not get turned
off, but the _OFF method on these already was a no-op, so this makes
no difference for the other 2 power resources.
Fixes: a1224f34d72a ("ACPI: PM: Check states of power resources during initialization")
Reported-by: Gé Koerkamp <ge.koerkamp@xxxxxxxxx>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216946
Link: https://lore.kernel.org/regressions/32a14a8a-9795-4c8c-7e00-da9012f548f8@xxxxxxxxxxxxx/
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
drivers/acpi/power.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c
index 292cec3691cc..5dc792961ab8 100644
--- a/drivers/acpi/power.c
+++ b/drivers/acpi/power.c
@@ -23,6 +23,7 @@
#define pr_fmt(fmt) "ACPI: PM: " fmt
+#include <linux/dmi.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
@@ -1022,6 +1023,21 @@ void acpi_resume_power_resources(void)
}
#endif
+static const struct dmi_system_id dmi_leave_unused_power_resources_on[] = {
+ {
+ /*
+ * The Toshiba Click Mini has a CPR3 power-resource which must
+ * be on for the touchscreen to work, but which is not in any
+ * _PR? lists. The other 2 affected power-resources are no-ops.
+ */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE Click Mini L9W-B"),
+ },
+ },
+ {}
+};
+
/**
* acpi_turn_off_unused_power_resources - Turn off power resources not in use.
*/
@@ -1029,6 +1045,9 @@ void acpi_turn_off_unused_power_resources(void)
{
struct acpi_power_resource *resource;
+ if (dmi_check_system(dmi_leave_unused_power_resources_on))
+ return;
+
mutex_lock(&power_resource_list_lock);
list_for_each_entry_reverse(resource, &acpi_power_resource_list, list_node) {
--
2.39.2
