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gpiolib: acpi: Add gpiolib_acpi_run_edge_events_on_boot option and blacklist 

Another day; another DSDT bug we need to workaround...

Since commit ca876c7483 ("gpiolib-acpi: make sure we trigger edge events
at least once on boot") we call _AEI edge handlers at boot.

In some rare cases this causes problems. One example of this is the Minix
Neo Z83-4 mini PC, this device has a clear DSDT bug where it has some copy
and pasted code for dealing with Micro USB-B connector host/device role
switching, while the mini PC does not even have a micro-USB connector.
This code, which should not be there, messes with the DDC data pin from
the HDMI connector (switching it to GPIO mode) breaking HDMI support.

To avoid problems like this, this commit adds a new
gpiolib_acpi.run_edge_events_on_boot kernel commandline option, which
allows disabling the running of _AEI edge event handlers at boot.

The default value is -1/auto which uses a DMI based blacklist, the initial
version of this blacklist contains the Neo Z83-4 fixing the HDMI breakage.

Cc: stable@vger.kernel.org
Cc: Daniel Drake <drake@endlessm.com>
Cc: Ian W MORRISON <ianwmorrison@gmail.com>
Reported-by: Ian W MORRISON <ianwmorrison@gmail.com>
Suggested-by: Ian W MORRISON <ianwmorrison@gmail.com>
Fixes: ca876c7483 ("gpiolib-acpi: make sure we trigger edge events at least once on boot")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20190827202835.213456-1-hdegoede@redhat.com
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Ian W MORRISON <ianwmorrison@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Hans de Goede 2019-08-27 22:28:35 +02:00 committed by Linus Walleij
parent 1dea33e84d
commit 61f7f7c8f9
1 changed files with 38 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/gpio/gpiolib-acpi.c
View File

@ -7,6 +7,7 @@
* Mika Westerberg <mika.westerberg@linux.intel.com>
*/
#include <linux/dmi.h>
#include <linux/errno.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.h>
@ -19,6 +20,11 @@
#include "gpiolib.h"
static int run_edge_events_on_boot = -1;
module_param(run_edge_events_on_boot, int, 0444);
MODULE_PARM_DESC(run_edge_events_on_boot,
"Run edge _AEI event-handlers at boot: 0=no, 1=yes, -1=auto");
/**
* struct acpi_gpio_event - ACPI GPIO event handler data
*
@ -170,10 +176,13 @@ static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
event->irq_requested = true;
/* Make sure we trigger the initial state of edge-triggered IRQs */
value = gpiod_get_raw_value_cansleep(event->desc);
if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
event->handler(event->irq, event);
if (run_edge_events_on_boot &&
(event->irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))) {
value = gpiod_get_raw_value_cansleep(event->desc);
if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
event->handler(event->irq, event);
}
}
static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
@ -1283,3 +1292,28 @@ static int acpi_gpio_handle_deferred_request_irqs(void)
}
/* We must use _sync so that this runs after the first deferred_probe run */
late_initcall_sync(acpi_gpio_handle_deferred_request_irqs);
static const struct dmi_system_id run_edge_events_on_boot_blacklist[] = {
{
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
}
},
{} /* Terminating entry */
};
static int acpi_gpio_setup_params(void)
{
if (run_edge_events_on_boot < 0) {
if (dmi_check_system(run_edge_events_on_boot_blacklist))
run_edge_events_on_boot = 0;
else
run_edge_events_on_boot = 1;
}
return 0;
}
/* Directly after dmi_setup() which runs as core_initcall() */
postcore_initcall(acpi_gpio_setup_params);