Hi,

On 28-08-19 14:20, Hans de Goede wrote:

Hi,

On 28-08-19 13:37, Andy Shevchenko wrote:

...

On Tue, Aug 27, 2019 at 10:28:35PM +0200, Hans de Goede wrote:

...

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

Since commit ca876c7483b6 ("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.

Thank you!

Assuming it works for Ian, Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com

Note I have access to a Minix Neo Z83-4 myself now and I did test that this fixes it and that passing gpiolib_acpi.run_edge_events_on_boot=0 breaks HDMI again (so the option works).

Erm that should be gpiolib_acpi.run_edge_events_on_boot=1 (not 0) breaks HDMI.

Regards,

Hans

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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: ca876c7483b6 ("gpiolib-acpi: make sure we trigger edge events at least once on boot") Signed-off-by: Hans de Goede hdegoede@redhat.com

---

Changes in v2:

• Use a module_param instead of __setup
• Do DMI check only once from a postcore_initcall

---

drivers/gpio/gpiolib-acpi.c | 42 +++++++++++++++++++++++++++++++++----   1 file changed, 38 insertions(+), 4 deletions(-)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c index 39f2f9035c11..bda28eb82c3f 100644 --- a/drivers/gpio/gpiolib-acpi.c +++ b/drivers/gpio/gpiolib-acpi.c @@ -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);

2.23.0