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Date: Thu, 5 Jan 2017 17:39:08 +0100
From: Thierry Escande <thierry.escande@...labora.com>
To: Lee Jones <lee.jones@...aro.org>,
"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Benson Leung <bleung@...omium.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mfd: cros_ec: Add ACPI GPE handler for LID0 devices
On 05/01/2017 15:43, Lee Jones wrote:
> Rafael,
>
> On Thu, 05 Jan 2017, Thierry Escande wrote:
>
>> Hi Lee,
>>
>> On 05/01/2017 08:54, Lee Jones wrote:
>>> On Wed, 04 Jan 2017, Thierry Escande wrote:
>>>
>>>> Hi Lee,
>>>>
>>>> On 04/01/2017 10:06, Lee Jones wrote:
>>>>> On Fri, 16 Dec 2016, Thierry Escande wrote:
>>>>>
>>>>>> From: Archana Patni <archana.patni@...el.com>
>>>>>>
>>>>>> This patch installs an ACPI GPE handler for LID0 ACPI device to indicate
>>>>>> ACPI core that this GPE should stay enabled for lid to work in suspend
>>>>>> to idle path.
>>>>>>
>>>>>> Signed-off-by: Archana Patni <archana.patni@...el.com>
>>>>>> Signed-off-by: Thierry Escande <thierry.escande@...labora.com>
>>>>>> ---
>>>>>> drivers/mfd/cros_ec.c | 97 +++++++++++++++++++++++++++++++++++++++++++++++++--
>>>>>> 1 file changed, 95 insertions(+), 2 deletions(-)
>>>>>>
>>>>>> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
>>>>>> index b8a5080..628718e 100644
>>>>>> --- a/drivers/mfd/cros_ec.c
>>>>>> +++ b/drivers/mfd/cros_ec.c
>>>>>> @@ -17,6 +17,9 @@
>>>>>> * battery charging and regulator control, firmware update.
>>>>>> */
>>>>>>
>>>>>> +#ifdef CONFIG_ACPI
>>>>>> +#include <linux/acpi.h>
>>>>>> +#endif
>>>>>
>>>>> Please don't place #ifery in C files.
>>>>>
>>>>>> #include <linux/of_platform.h>
>>>>>> #include <linux/interrupt.h>
>>>>>> #include <linux/slab.h>
>>>>>> @@ -29,6 +32,73 @@
>>>>>> #define CROS_EC_DEV_EC_INDEX 0
>>>>>> #define CROS_EC_DEV_PD_INDEX 1
>>>>>>
>>>>>> +#ifdef CONFIG_ACPI
>>>>>
>>>>> Remove this.
>>>>>
>>>>>> +#define ACPI_LID_DEVICE "LID0"
>>>>>> +
>>>>>> +static int ec_wake_gpe = -EINVAL;
>>>>>> +
>>>>>> +/*
>>>>>> + * This handler indicates to ACPI core that this GPE should stay enabled for
>>>>>> + * lid to work in suspend to idle path.
>>>>>> + */
>>>>>> +static u32 cros_ec_gpe_handler(acpi_handle gpe_device, u32 gpe_number,
>>>>>> + void *data)
>>>>>> +{
>>>>>> + return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE;
>>>>>> +}
>>>>>> +
>>>>>> +/*
>>>>>> + * Get ACPI GPE for LID0 device.
>>>>>> + */
>>>>>> +static int cros_ec_get_ec_wake_gpe(struct device *dev)
>>>>>> +{
>>>> If it's ok for you, I'll keep one #ifdef CONFIG_ACPI around the body of this
>>>> function. Otherwise it won't compile if CONFIG_ACPI is not set.
>>>
>>> Can you try placing:
>>>
>>> if (IS_ENABLED(CONFIG_ACPI))
>>>
>>> ... before the call to cros_ec_get_ec_wake_gpe() and see if the
>>> compiler will do-the-right-thing please?
>>
>> With CONFIG_ACPI not defined, the acpi_dev structure is not defined as well
>> as the acpi_bus_get_device() API. So no, the compiler is not smart enough
>> even if the function body is skipped by the test:
>> if (!IS_ENABLED(CONFIG_ACPI))
>> return -ENODEV;
>
> Is there any way we can make ACPI play nicely if it's not enabled?
>
> I'm thinking stubs. Like we do for most other things.
Or I can move the 2 functions into a separate file compiled only if ACPI
is enabled.
Regards,
Thierry
>
>>>>>> + struct acpi_device *cros_acpi_dev;
>>>>>> + struct acpi_device *adev;
>>>>>> + acpi_handle handle;
>>>>>> + acpi_status status;
>>>>>> + int ret;
>>>>>> +
>>>>>> + cros_acpi_dev = ACPI_COMPANION(dev);
>>>>>> +
>>>>>> + if (!cros_acpi_dev || !cros_acpi_dev->parent ||
>>>>>> + !cros_acpi_dev->parent->handle)
>>>>>> + return -EINVAL;
>>>>>> +
>>>>>> + status = acpi_get_handle(cros_acpi_dev->parent->handle, ACPI_LID_DEVICE,
>>>>>> + &handle);
>>>>>> + if (ACPI_FAILURE(status))
>>>>>> + return -EINVAL;
>>>>>> +
>>>>>> + ret = acpi_bus_get_device(handle, &adev);
>>>>>> + if (ret)
>>>>>> + return ret;
>>>>>> +
>>>>>> + return adev->wakeup.gpe_number;
>>>>>> +}
>>>>>> +
>>>>>> +static int cros_ec_install_handler(struct device *dev)
>>>>>> +{
>>>>>> + acpi_status status;
>>>>>> +
>>>>>> + ec_wake_gpe = cros_ec_get_ec_wake_gpe(dev);
>>>>>> +
>>>>>> + if (ec_wake_gpe < 0)
>>>>>> + return ec_wake_gpe;
>>>>>> +
>>>>>> + status = acpi_install_gpe_handler(NULL, ec_wake_gpe,
>>>>>> + ACPI_GPE_EDGE_TRIGGERED,
>>>>>> + &cros_ec_gpe_handler, NULL);
>>>>>> + if (ACPI_FAILURE(status))
>>>>>> + return -ENODEV;
>>>>>> +
>>>>>> + dev_info(dev, "Initialized, GPE = 0x%x\n", ec_wake_gpe);
>>>>>> +
>>>>>> + return 0;
>>>>>> +}
>>>>>> +
>>>>>> +#endif
>>>>>> +
>>>>>> static struct cros_ec_platform ec_p = {
>>>>>> .ec_name = CROS_EC_DEV_NAME,
>>>>>> .cmd_offset = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_EC_INDEX),
>>>>>> @@ -166,6 +236,10 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
>>>>>>
>>>>>> dev_info(dev, "Chrome EC device registered\n");
>>>>>>
>>>>>> +#ifdef CONFIG_ACPI
>>>>>> + cros_ec_install_handler(dev);
>>>>>> +#endif
>>>>>
>>>>> Here, just do:
>>>>>
>>>>> if (IS_ENABLED(CONFIG_ACPI))
>>>>> cros_ec_install_handler(dev);
>>>>>
>>>>> And let the compiler take care of the rest.
>>>>>
>>>>>> return 0;
>>>>>>
>>>>>> fail_mfd:
>>>>>> @@ -179,6 +253,17 @@ int cros_ec_remove(struct cros_ec_device *ec_dev)
>>>>>> {
>>>>>> mfd_remove_devices(ec_dev->dev);
>>>>>>
>>>>>> +#ifdef CONFIG_ACPI
>>>>>> + if (ec_wake_gpe >= 0) {
>>>>>
>>>>> if (IS_ENABLED(CONFIG_ACPI) && ec_wake_gpe >= 0) {
>>>>>
>>>>>> + acpi_status status;
>>>>>> +
>>>>>> + status = acpi_remove_gpe_handler(NULL, ec_wake_gpe,
>>>>>> + &cros_ec_gpe_handler);
>>>>>> + if (ACPI_FAILURE(status))
>>>>>> + pr_err("failed to remove gpe handler\n");
>>>>>> + }
>>>>>> +#endif
>>>>>> +
>>>>>> return 0;
>>>>>> }
>>>>>> EXPORT_SYMBOL(cros_ec_remove);
>>>>>> @@ -190,8 +275,16 @@ int cros_ec_suspend(struct cros_ec_device *ec_dev)
>>>>>> int ret;
>>>>>> u8 sleep_event;
>>>>>>
>>>>>> - sleep_event = pm_suspend_via_firmware() ? HOST_SLEEP_EVENT_S3_RESUME :
>>>>>> - HOST_SLEEP_EVENT_S0IX_RESUME;
>>>>>> + if (!pm_suspend_via_firmware()) {
>>>>>> + sleep_event = HOST_SLEEP_EVENT_S0IX_SUSPEND;
>>>>>> +#ifdef CONFIG_ACPI
>>>>>> + /* Clearing the GPE status for any pending event */
>>>>>> + if (ec_wake_gpe >= 0)
>>>>>
>>>>> As above.
>>>>>
>>>>>> + acpi_clear_gpe(NULL, ec_wake_gpe);
>>>>>> +#endif
>>>>>> + } else {
>>>>>> + sleep_event = HOST_SLEEP_EVENT_S3_SUSPEND;
>>>>>> + }
>>>>>>
>>>>>> ret = cros_ec_sleep_event(ec_dev, sleep_event);
>>>>>> if (ret < 0)
>>>>>
>>>
>
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