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Date: Wed, 14 Sep 2022 08:54:31 +0300
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: Raul E Rangel <rrangel@...omium.org>
Cc: linux-acpi@...r.kernel.org, linux-input@...r.kernel.org,
andriy.shevchenko@...ux.intel.com, jingle.wu@....com.tw,
mario.limonciello@....com, timvp@...gle.com,
linus.walleij@...aro.org, hdegoede@...hat.com, rafael@...nel.org,
Wolfram Sang <wsa@...nel.org>, linux-i2c@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 07/13] i2c: acpi: Use ACPI wake capability bit to set
wake_irq
Hi,
On Mon, Sep 12, 2022 at 04:13:11PM -0600, Raul E Rangel wrote:
> Device tree already has a mechanism to pass the wake_irq. It does this
> by looking for the wakeup-source property and setting the
> I2C_CLIENT_WAKE flag. This CL adds the ACPI equivalent. It uses the
> ACPI interrupt wake flag to determine if the interrupt can be used to
> wake the system. Previously the i2c drivers had to make assumptions and
> blindly enable the wake IRQ. This can cause spurious wake events. e.g.,
> If there is a device with an Active Low interrupt and the device gets
> powered off while suspending, the interrupt line will go low since it's
> no longer powered and wakes the system. For this reason we should
> respect the board designers wishes and honor the wake bit defined on the
> interrupt.
>
> Signed-off-by: Raul E Rangel <rrangel@...omium.org>
> ---
>
> Changes in v2:
> - Look at wake_cabple bit for IRQ/Interrupt resources
>
> drivers/i2c/i2c-core-acpi.c | 37 ++++++++++++++++++++++++++++---------
> drivers/i2c/i2c-core-base.c | 6 +++++-
> drivers/i2c/i2c-core.h | 4 ++--
> 3 files changed, 35 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
> index c762a879c4cc6b..c3d69b287df824 100644
> --- a/drivers/i2c/i2c-core-acpi.c
> +++ b/drivers/i2c/i2c-core-acpi.c
> @@ -137,6 +137,11 @@ static const struct acpi_device_id i2c_acpi_ignored_device_ids[] = {
> {}
> };
>
> +struct i2c_acpi_irq_context {
> + int irq;
> + int wake_capable;
Why not bool?
Also perhaps 'wakeable'?
> +};
> +
> static int i2c_acpi_do_lookup(struct acpi_device *adev,
> struct i2c_acpi_lookup *lookup)
> {
> @@ -170,11 +175,14 @@ static int i2c_acpi_do_lookup(struct acpi_device *adev,
>
> static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data)
> {
> - int *irq = data;
> + struct i2c_acpi_irq_context *irq_ctx = data;
> struct resource r;
>
> - if (*irq <= 0 && acpi_dev_resource_interrupt(ares, 0, &r))
> - *irq = i2c_dev_irq_from_resources(&r, 1);
> + if (irq_ctx->irq <= 0 && acpi_dev_resource_interrupt(ares, 0, &r)) {
> + irq_ctx->irq = i2c_dev_irq_from_resources(&r, 1);
> + irq_ctx->wake_capable =
> + r.flags & IORESOURCE_IRQ_WAKECAPABLE ? 1 : 0;
Then you can just do this:
irq_ctx->wakeable = r.flags & IORESOURCE_IRQ_WAKECAPABLE;
> + }
>
> return 1; /* No need to add resource to the list */
> }
> @@ -182,31 +190,42 @@ static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data)
> /**
> * i2c_acpi_get_irq - get device IRQ number from ACPI
> * @client: Pointer to the I2C client device
> + * @wake_capable: Set to 1 if the IRQ is wake capable
> *
> * Find the IRQ number used by a specific client device.
> *
> * Return: The IRQ number or an error code.
> */
> -int i2c_acpi_get_irq(struct i2c_client *client)
> +int i2c_acpi_get_irq(struct i2c_client *client, int *wake_capable)
bool here too
> {
> struct acpi_device *adev = ACPI_COMPANION(&client->dev);
> struct list_head resource_list;
> - int irq = -ENOENT;
> + struct i2c_acpi_irq_context irq_ctx = {
> + .irq = -ENOENT,
> + .wake_capable = 0,
> + };
> int ret;
>
> INIT_LIST_HEAD(&resource_list);
>
> + if (wake_capable)
> + *wake_capable = 0;
I think it is better to touch this only after the function succeeds so..
> +
> ret = acpi_dev_get_resources(adev, &resource_list,
> - i2c_acpi_add_resource, &irq);
> + i2c_acpi_add_resource, &irq_ctx);
> if (ret < 0)
> return ret;
>
> acpi_dev_free_resource_list(&resource_list);
>
> - if (irq == -ENOENT)
> - irq = acpi_dev_gpio_irq_get(adev, 0);
> + if (irq_ctx.irq == -ENOENT)
> + irq_ctx.irq = acpi_dev_gpio_irq_get_wake(
> + adev, 0, &irq_ctx.wake_capable);
> +
> + if (wake_capable)
> + *wake_capable = irq_ctx.wake_capable;
... here only.
>
> - return irq;
> + return irq_ctx.irq;
> }
>
> static int i2c_acpi_get_info(struct acpi_device *adev,
> diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
> index 91007558bcb260..97315b41550213 100644
> --- a/drivers/i2c/i2c-core-base.c
> +++ b/drivers/i2c/i2c-core-base.c
> @@ -468,6 +468,7 @@ static int i2c_device_probe(struct device *dev)
> struct i2c_client *client = i2c_verify_client(dev);
> struct i2c_driver *driver;
> int status;
> + int acpi_wake_capable = 0;
You can declare this in the below block instead.
>
> if (!client)
> return 0;
> @@ -487,7 +488,10 @@ static int i2c_device_probe(struct device *dev)
> if (irq == -EINVAL || irq == -ENODATA)
> irq = of_irq_get(dev->of_node, 0);
> } else if (ACPI_COMPANION(dev)) {
bool wakeable;
> - irq = i2c_acpi_get_irq(client);
> + irq = i2c_acpi_get_irq(client, &acpi_wake_capable);
> +
if (irq > 0 && wakeable)
client->flags |= I2C_CLIENT_WAKE;
> }
> if (irq == -EPROBE_DEFER) {
> status = irq;
> diff --git a/drivers/i2c/i2c-core.h b/drivers/i2c/i2c-core.h
> index 87e2c914f1c57b..8e336638a0cd2e 100644
> --- a/drivers/i2c/i2c-core.h
> +++ b/drivers/i2c/i2c-core.h
> @@ -61,11 +61,11 @@ static inline int __i2c_check_suspended(struct i2c_adapter *adap)
> #ifdef CONFIG_ACPI
> void i2c_acpi_register_devices(struct i2c_adapter *adap);
>
> -int i2c_acpi_get_irq(struct i2c_client *client);
> +int i2c_acpi_get_irq(struct i2c_client *client, int *wake_capable);
> #else /* CONFIG_ACPI */
> static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { }
>
> -static inline int i2c_acpi_get_irq(struct i2c_client *client)
> +static inline int i2c_acpi_get_irq(struct i2c_client *client, int *wake_capable)
> {
> return 0;
> }
> --
> 2.37.2.789.g6183377224-goog
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