| Message ID | 20220914155914.v3.7.I8af4282adc72eb9f247adcd03676a43893a020a6@changeid |
|---|---|
| State | New |
| Headers | show |
| Series | acpi: i2c: Use SharedAndWake and ExclusiveAndWake to enable wake irq | expand |
On Wed, Sep 14, 2022 at 05:57:55PM -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@chromium.org> > --- > > Changes in v3: > - Convert wake_capable to bool > - Only update wake_capable pointer once > - Move wake_capable local into local block > > Changes in v2: > - Look at wake_cabple bit for IRQ/Interrupt resources > > drivers/i2c/i2c-core-acpi.c | 33 ++++++++++++++++++++++++--------- > drivers/i2c/i2c-core-base.c | 8 +++++++- > drivers/i2c/i2c-core.h | 4 ++-- > 3 files changed, 33 insertions(+), 12 deletions(-) > > diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c > index c762a879c4cc6b..b3d68a9659ff4f 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; > + bool wake_capable; > +}; > + > 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); You don't need the !!() here. Just irq_ctx->wake_capable = r.flags & IORESOURCE_IRQ_WAKECAPABLE; > + } > > return 1; /* No need to add resource to the list */ > } > @@ -182,31 +190,38 @@ 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 true 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, bool *wake_capable) > { > 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, > + }; > int ret; > > INIT_LIST_HEAD(&resource_list); > > 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_wake_get(adev, 0, > + &irq_ctx.wake_capable); > + > + if (wake_capable) > + *wake_capable = irq_ctx.wake_capable; > > - 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..c4debd46c6340f 100644 > --- a/drivers/i2c/i2c-core-base.c > +++ b/drivers/i2c/i2c-core-base.c > @@ -487,8 +487,14 @@ 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)) { > - irq = i2c_acpi_get_irq(client); > + bool wake_capable; > + > + irq = i2c_acpi_get_irq(client, &wake_capable); > + Drop the empty line here. > + if (irq > 0 && wake_capable) > + client->flags |= I2C_CLIENT_WAKE; > } > + Unrelated whitespace change. With those fixed feel free to add, Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
On Wed, Sep 14, 2022 at 05:57:55PM -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. Okay, let's go with this variant, but I'm afraid that in time we may come up to the proposed (generic structure for ACPI IRQ parameters which can be used in a few places). Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > Signed-off-by: Raul E Rangel <rrangel@chromium.org> > --- > > Changes in v3: > - Convert wake_capable to bool > - Only update wake_capable pointer once > - Move wake_capable local into local block > > Changes in v2: > - Look at wake_cabple bit for IRQ/Interrupt resources > > drivers/i2c/i2c-core-acpi.c | 33 ++++++++++++++++++++++++--------- > drivers/i2c/i2c-core-base.c | 8 +++++++- > drivers/i2c/i2c-core.h | 4 ++-- > 3 files changed, 33 insertions(+), 12 deletions(-) > > diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c > index c762a879c4cc6b..b3d68a9659ff4f 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; > + bool wake_capable; > +}; > + > 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); > + } Maybe if (irq_ctx->irq > 0) return 1; if (!acpi_dev_resource_interrupt(ares, 0, &r)) return 1; irq_ctx->irq = i2c_dev_irq_from_resources(&r, 1); irq_ctx->wake_capable = !!(r.flags & IORESOURCE_IRQ_WAKECAPABLE); ? > return 1; /* No need to add resource to the list */ > } Also not sure why the callback is not called i2c_acpi_add_irq_resource(). But it probably can be done in a separate change. > @@ -182,31 +190,38 @@ 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 true 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, bool *wake_capable) > { > 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, > + }; > int ret; > > INIT_LIST_HEAD(&resource_list); > > 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_wake_get(adev, 0, > + &irq_ctx.wake_capable); > + > + if (wake_capable) > + *wake_capable = irq_ctx.wake_capable; > > - 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..c4debd46c6340f 100644 > --- a/drivers/i2c/i2c-core-base.c > +++ b/drivers/i2c/i2c-core-base.c > @@ -487,8 +487,14 @@ 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)) { > - irq = i2c_acpi_get_irq(client); > + bool wake_capable; > + > + irq = i2c_acpi_get_irq(client, &wake_capable); > + Unneeded blank line. > + if (irq > 0 && wake_capable) > + client->flags |= I2C_CLIENT_WAKE; > } > + Ditto. (This even looks like a stray change) > if (irq == -EPROBE_DEFER) { > status = irq; > goto put_sync_adapter; > diff --git a/drivers/i2c/i2c-core.h b/drivers/i2c/i2c-core.h > index 87e2c914f1c57b..1247e6e6e97517 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, bool *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, bool *wake_capable) > { > return 0; > } > -- > 2.37.3.968.ga6b4b080e4-goog >
On Mon, Sep 19, 2022 at 3:54 AM Andy Shevchenko <andriy.shevchenko@linux.intel.com> wrote: > > On Wed, Sep 14, 2022 at 05:57:55PM -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. > > Okay, let's go with this variant, but I'm afraid that in time we may come up > to the proposed (generic structure for ACPI IRQ parameters which can be used > in a few places). > > Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > > > Signed-off-by: Raul E Rangel <rrangel@chromium.org> > > --- > > > > Changes in v3: > > - Convert wake_capable to bool > > - Only update wake_capable pointer once > > - Move wake_capable local into local block > > > > Changes in v2: > > - Look at wake_cabple bit for IRQ/Interrupt resources > > > > drivers/i2c/i2c-core-acpi.c | 33 ++++++++++++++++++++++++--------- > > drivers/i2c/i2c-core-base.c | 8 +++++++- > > drivers/i2c/i2c-core.h | 4 ++-- > > 3 files changed, 33 insertions(+), 12 deletions(-) > > > > diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c > > index c762a879c4cc6b..b3d68a9659ff4f 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; > > + bool wake_capable; > > +}; > > + > > 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); > > + } > > Maybe > > if (irq_ctx->irq > 0) > return 1; > > if (!acpi_dev_resource_interrupt(ares, 0, &r)) > return 1; > > irq_ctx->irq = i2c_dev_irq_from_resources(&r, 1); > irq_ctx->wake_capable = !!(r.flags & IORESOURCE_IRQ_WAKECAPABLE); > > ? > > > return 1; /* No need to add resource to the list */ > > } > Done > Also not sure why the callback is not called i2c_acpi_add_irq_resource(). > But it probably can be done in a separate change. > I had the same thought. I went ahead and added it into this change since I already refactored the logic like you suggested above. > > @@ -182,31 +190,38 @@ 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 true 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, bool *wake_capable) > > { > > 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, > > + }; > > int ret; > > > > INIT_LIST_HEAD(&resource_list); > > > > 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_wake_get(adev, 0, > > + &irq_ctx.wake_capable); > > + > > + if (wake_capable) > > + *wake_capable = irq_ctx.wake_capable; > > > > - 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..c4debd46c6340f 100644 > > --- a/drivers/i2c/i2c-core-base.c > > +++ b/drivers/i2c/i2c-core-base.c > > @@ -487,8 +487,14 @@ 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)) { > > - irq = i2c_acpi_get_irq(client); > > + bool wake_capable; > > + > > + irq = i2c_acpi_get_irq(client, &wake_capable); > > > + > > Unneeded blank line. > Done > > + if (irq > 0 && wake_capable) > > + client->flags |= I2C_CLIENT_WAKE; > > } > > > + > > Ditto. (This even looks like a stray change) > Done > > if (irq == -EPROBE_DEFER) { > > status = irq; > > goto put_sync_adapter; > > diff --git a/drivers/i2c/i2c-core.h b/drivers/i2c/i2c-core.h > > index 87e2c914f1c57b..1247e6e6e97517 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, bool *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, bool *wake_capable) > > { > > return 0; > > } > > -- > > 2.37.3.968.ga6b4b080e4-goog > > > > -- > With Best Regards, > Andy Shevchenko > > I'll send out a V4 series in a few minutes with all the latest changes. Thanks!
diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c index c762a879c4cc6b..b3d68a9659ff4f 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; + bool wake_capable; +}; + 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); + } return 1; /* No need to add resource to the list */ } @@ -182,31 +190,38 @@ 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 true 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, bool *wake_capable) { 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, + }; int ret; INIT_LIST_HEAD(&resource_list); 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_wake_get(adev, 0, + &irq_ctx.wake_capable); + + if (wake_capable) + *wake_capable = irq_ctx.wake_capable; - 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..c4debd46c6340f 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -487,8 +487,14 @@ 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)) { - irq = i2c_acpi_get_irq(client); + bool wake_capable; + + irq = i2c_acpi_get_irq(client, &wake_capable); + + if (irq > 0 && wake_capable) + client->flags |= I2C_CLIENT_WAKE; } + if (irq == -EPROBE_DEFER) { status = irq; goto put_sync_adapter; diff --git a/drivers/i2c/i2c-core.h b/drivers/i2c/i2c-core.h index 87e2c914f1c57b..1247e6e6e97517 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, bool *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, bool *wake_capable) { return 0; }
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@chromium.org> --- Changes in v3: - Convert wake_capable to bool - Only update wake_capable pointer once - Move wake_capable local into local block Changes in v2: - Look at wake_cabple bit for IRQ/Interrupt resources drivers/i2c/i2c-core-acpi.c | 33 ++++++++++++++++++++++++--------- drivers/i2c/i2c-core-base.c | 8 +++++++- drivers/i2c/i2c-core.h | 4 ++-- 3 files changed, 33 insertions(+), 12 deletions(-)