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SubjectRE: [PATCH v4 3/3] eeprom: at24: enable runtime pm support
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Hi Sakari,

Thanks for the review.
My comments below.

---
^Divagar

>-----Original Message-----
>From: Sakari Ailus [mailto:sakari.ailus@iki.fi]
>Sent: Thursday, August 31, 2017 2:50 AM
>To: Mohandass, Divagar <divagar.mohandass@intel.com>
>Cc: robh+dt@kernel.org; mark.rutland@arm.com; wsa@the-dreams.de;
>devicetree@vger.kernel.org; linux-i2c@vger.kernel.org; linux-
>kernel@vger.kernel.org; Mani, Rajmohan <rajmohan.mani@intel.com>
>Subject: Re: [PATCH v4 3/3] eeprom: at24: enable runtime pm support
>
>Hi Divagar,
>
>Thanks for the update.
>
>On Wed, Aug 30, 2017 at 10:35:40PM +0530, Divagar Mohandass wrote:
>> Currently the device is kept in D0, there is an opportunity to save
>> power by enabling runtime pm.
>>
>> Device can be daisy chained from PMIC and we can't rely on I2C core
>> for auto resume/suspend. Driver will decide when to resume/suspend.
>>
>> Signed-off-by: Divagar Mohandass <divagar.mohandass@intel.com>
>> ---
>> drivers/misc/eeprom/at24.c | 40
>> ++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 40 insertions(+)
>>
>> diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
>> index 2199c42..65a7d83 100644
>> --- a/drivers/misc/eeprom/at24.c
>> +++ b/drivers/misc/eeprom/at24.c
>> @@ -24,6 +24,7 @@
>> #include <linux/i2c.h>
>> #include <linux/nvmem-provider.h>
>> #include <linux/platform_data/at24.h>
>> +#include <linux/pm_runtime.h>
>>
>> /*
>> * I2C EEPROMs from most vendors are inexpensive and mostly
>interchangeable.
>> @@ -501,11 +502,21 @@ static ssize_t at24_eeprom_write_i2c(struct
>> at24_data *at24, const char *buf, static int at24_read(void *priv,
>> unsigned int off, void *val, size_t count) {
>> struct at24_data *at24 = priv;
>> + struct i2c_client *client;
>> char *buf = val;
>> + int ret;
>>
>> if (unlikely(!count))
>> return count;
>>
>> + client = at24_translate_offset(at24, &off);
>> +
>> + ret = pm_runtime_get_sync(&client->dev);
>> + if (ret < 0) {
>> + pm_runtime_put_noidle(&client->dev);
>> + return ret;
>> + }
>> +
>> /*
>> * Read data from chip, protecting against concurrent updates
>> * from this host, but not from other I2C masters.
>> @@ -518,6 +529,7 @@ static int at24_read(void *priv, unsigned int off,
>void *val, size_t count)
>> status = at24->read_func(at24, buf, off, count);
>> if (status < 0) {
>> mutex_unlock(&at24->lock);
>> + pm_runtime_put(&client->dev);
>> return status;
>> }
>> buf += status;
>> @@ -527,17 +539,29 @@ static int at24_read(void *priv, unsigned int
>> off, void *val, size_t count)
>>
>> mutex_unlock(&at24->lock);
>>
>> + pm_runtime_put(&client->dev);
>> +
>> return 0;
>> }
>>
>> static int at24_write(void *priv, unsigned int off, void *val, size_t
>> count) {
>> struct at24_data *at24 = priv;
>> + struct i2c_client *client;
>> char *buf = val;
>> + int ret;
>>
>> if (unlikely(!count))
>> return -EINVAL;
>>
>> + client = at24_translate_offset(at24, &off);
>> +
>> + ret = pm_runtime_get_sync(&client->dev);
>> + if (ret < 0) {
>> + pm_runtime_put_noidle(&client->dev);
>> + return ret;
>> + }
>> +
>> /*
>> * Write data to chip, protecting against concurrent updates
>> * from this host, but not from other I2C masters.
>> @@ -550,6 +574,7 @@ static int at24_write(void *priv, unsigned int off,
>void *val, size_t count)
>> status = at24->write_func(at24, buf, off, count);
>> if (status < 0) {
>> mutex_unlock(&at24->lock);
>> + pm_runtime_put(&client->dev);
>> return status;
>> }
>> buf += status;
>> @@ -559,6 +584,8 @@ static int at24_write(void *priv, unsigned int
>> off, void *val, size_t count)
>>
>> mutex_unlock(&at24->lock);
>>
>> + pm_runtime_put(&client->dev);
>> +
>> return 0;
>> }
>>
>> @@ -743,6 +770,14 @@ static int at24_probe(struct i2c_client *client,
>> const struct i2c_device_id *id)
>>
>> i2c_set_clientdata(client, at24);
>>
>> + /* enable runtime pm */
>> + pm_runtime_get_noresume(&client->dev);
>> + err = pm_runtime_set_active(&client->dev);
>> + if (err < 0)
>> + goto err_clients;
>
>Btw. I don't think pm_runtime_set_active() can fail here. In other words it'd be
>fine to ignore the return value.
>

Ack


>> +
>> + pm_runtime_enable(&client->dev);
>> +
>> /*
>> * Perform a one-byte test read to verify that the
>> * chip is functional.
>> @@ -753,6 +788,8 @@ static int at24_probe(struct i2c_client *client, const
>struct i2c_device_id *id)
>> goto err_clients;
>
>I suppose the runtime PM state is re-initialised for a device when a driver is
>probed, but it'd still be nice to decrement the use count if this fails.

Ack

>You should also disable PM runtime if probe fails and set the device
>suspended again.
>
>Same for other error cases. I think you'll need a new label.
>

Can I disable PM runtime and set suspend in the 'err_clients' label itself ?

>> }
>>
>> + pm_runtime_put(&client->dev);
>> +
>> at24->nvmem_config.name = dev_name(&client->dev);
>> at24->nvmem_config.dev = &client->dev;
>> at24->nvmem_config.read_only = !writable; @@ -810,6 +847,9 @@
>static
>> int at24_remove(struct i2c_client *client)
>> for (i = 1; i < at24->num_addresses; i++)
>> i2c_unregister_device(at24->client[i]);
>>
>> + pm_runtime_disable(&client->dev);
>> + pm_runtime_set_suspended(&client->dev);
>> +
>> return 0;
>> }
>>
>
>--
>Regards,
>
>Sakari Ailus
>e-mail: sakari.ailus@iki.fi

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