Hi,
On 3/22/19 12:05 PM, Ian W MORRISON wrote:
Patch ca876c7483b6 "gpiolib-acpi: make sure we trigger edge events at
least once on boot" causes the MINIX family of mini PCs to fail to boot
resulting in a "black screen".
This patch excludes MINIX devices from executing this trigger in order
to successfully boot.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Ian W MORRISON <ianwmorrison@xxxxxxxxx>
IMHO we need to root-cause this problem a bit more before applying this
kludge.
Can you provide an ACPI dump of one of the affected machines ?
Regards,
Hans
---
drivers/gpio/gpiolib-acpi.c | 28 +++++++++++++++++++++++-----
1 file changed, 23 insertions(+), 5 deletions(-)
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 259cf6ab969b..8d855dc9b020 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -16,9 +16,21 @@
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <linux/pinctrl/pinctrl.h>
+#include <linux/dmi.h>
#include "gpiolib.h"
+static const struct dmi_system_id skip_deferred_request_irqs_table[] = {
+ {
+ .ident = "MINIX Z83-4",
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "MINIX"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
+ },
+ },
+ {}
+};
+
/**
* struct acpi_gpio_event - ACPI GPIO event handler data
*
@@ -1219,18 +1231,24 @@ bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id)
}
/* Run deferred acpi_gpiochip_request_irqs() */
+/* but exclude devices known to fail */
static int acpi_gpio_handle_deferred_request_irqs(void)
{
struct acpi_gpio_chip *acpi_gpio, *tmp;
+ const struct dmi_system_id *dmi_id;
- mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
- list_for_each_entry_safe(acpi_gpio, tmp,
+ dmi_id = dmi_first_match(skip_deferred_request_irqs_table);
+
+ if (! dmi_id) {
+ mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
+ list_for_each_entry_safe(acpi_gpio, tmp,
&acpi_gpio_deferred_req_irqs_list,
deferred_req_irqs_list_entry)
- acpi_gpiochip_request_irqs(acpi_gpio);
+ acpi_gpiochip_request_irqs(acpi_gpio);
- acpi_gpio_deferred_req_irqs_done = true;
- mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
+ acpi_gpio_deferred_req_irqs_done = true;
+ mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
+ }
return 0;
}
