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{
    "id": 807389,
    "url": "http://patchwork.ozlabs.org/api/patches/807389/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/patch/1504066266-30051-4-git-send-email-divagar.mohandass@intel.com/",
    "project": {
        "id": 35,
        "url": "http://patchwork.ozlabs.org/api/projects/35/?format=api",
        "name": "Linux I2C development",
        "link_name": "linux-i2c",
        "list_id": "linux-i2c.vger.kernel.org",
        "list_email": "linux-i2c@vger.kernel.org",
        "web_url": "",
        "scm_url": "",
        "webscm_url": "",
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<1504066266-30051-4-git-send-email-divagar.mohandass@intel.com>",
    "list_archive_url": null,
    "date": "2017-08-30T04:11:06",
    "name": "[v3,3/3] eeprom: at24: enable runtime pm support",
    "commit_ref": null,
    "pull_url": null,
    "state": "superseded",
    "archived": false,
    "hash": "67281968c565281dc744aa327b0f627c53d4e2d4",
    "submitter": {
        "id": 72054,
        "url": "http://patchwork.ozlabs.org/api/people/72054/?format=api",
        "name": "Divagar Mohandass",
        "email": "divagar.mohandass@intel.com"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linux-i2c/patch/1504066266-30051-4-git-send-email-divagar.mohandass@intel.com/mbox/",
    "series": [
        {
            "id": 521,
            "url": "http://patchwork.ozlabs.org/api/series/521/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/linux-i2c/list/?series=521",
            "date": "2017-08-30T04:11:03",
            "name": "enable eeprom \"size\" property and runtime pm",
            "version": 3,
            "mbox": "http://patchwork.ozlabs.org/series/521/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/807389/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/807389/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<linux-i2c-owner@vger.kernel.org>",
        "X-Original-To": "incoming@patchwork.ozlabs.org",
        "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org",
        "Authentication-Results": "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=linux-i2c-owner@vger.kernel.org;\n\treceiver=<UNKNOWN>)",
        "Received": [
            "from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xhsXW4PBGz9ryr\n\tfor <incoming@patchwork.ozlabs.org>;\n\tWed, 30 Aug 2017 14:12:11 +1000 (AEST)",
            "(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1752011AbdH3EL4 (ORCPT <rfc822;incoming@patchwork.ozlabs.org>);\n\tWed, 30 Aug 2017 00:11:56 -0400",
            "from mga01.intel.com ([192.55.52.88]:62456 \"EHLO mga01.intel.com\"\n\trhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP\n\tid S1751927AbdH3ELy (ORCPT <rfc822;linux-i2c@vger.kernel.org>);\n\tWed, 30 Aug 2017 00:11:54 -0400",
            "from orsmga002.jf.intel.com ([10.7.209.21])\n\tby fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384;\n\t29 Aug 2017 21:11:53 -0700",
            "from div-optiplex-9010.iind.intel.com ([10.223.163.114])\n\tby orsmga002.jf.intel.com with ESMTP; 29 Aug 2017 21:11:49 -0700"
        ],
        "X-ExtLoop1": "1",
        "X-IronPort-AV": "E=Sophos;i=\"5.41,446,1498546800\"; d=\"scan'208\";a=\"129766628\"",
        "From": "Divagar Mohandass <divagar.mohandass@intel.com>",
        "To": "robh+dt@kernel.org, mark.rutland@arm.com, wsa@the-dreams.de,\n\tsakari.ailus@iki.fi",
        "Cc": "devicetree@vger.kernel.org, linux-i2c@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org, rajmohan.mani@intel.com,\n\tDivagar Mohandass <divagar.mohandass@intel.com>",
        "Subject": "[PATCH v3 3/3] eeprom: at24: enable runtime pm support",
        "Date": "Wed, 30 Aug 2017 09:41:06 +0530",
        "Message-Id": "<1504066266-30051-4-git-send-email-divagar.mohandass@intel.com>",
        "X-Mailer": "git-send-email 1.9.1",
        "In-Reply-To": "<1504066266-30051-1-git-send-email-divagar.mohandass@intel.com>",
        "References": "<1504066266-30051-1-git-send-email-divagar.mohandass@intel.com>",
        "Sender": "linux-i2c-owner@vger.kernel.org",
        "Precedence": "bulk",
        "List-ID": "<linux-i2c.vger.kernel.org>",
        "X-Mailing-List": "linux-i2c@vger.kernel.org"
    },
    "content": "Currently the device is kept in D0, there is an opportunity\nto save power by enabling runtime pm.\n\nDevice can be daisy chained from PMIC and we can't rely on I2C core\nfor auto resume/suspend. Driver will decide when to resume/suspend.\n\nSigned-off-by: Divagar Mohandass <divagar.mohandass@intel.com>\n---\n drivers/misc/eeprom/at24.c | 39 +++++++++++++++++++++++++++++++++++++++\n 1 file changed, 39 insertions(+)",
    "diff": "diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c\nindex 2199c42..a670814 100644\n--- a/drivers/misc/eeprom/at24.c\n+++ b/drivers/misc/eeprom/at24.c\n@@ -24,6 +24,7 @@\n #include <linux/i2c.h>\n #include <linux/nvmem-provider.h>\n #include <linux/platform_data/at24.h>\n+#include <linux/pm_runtime.h>\n \n /*\n  * I2C EEPROMs from most vendors are inexpensive and mostly interchangeable.\n@@ -501,11 +502,22 @@ static ssize_t at24_eeprom_write_i2c(struct at24_data *at24, const char *buf,\n static int at24_read(void *priv, unsigned int off, void *val, size_t count)\n {\n \tstruct at24_data *at24 = priv;\n+\tstruct i2c_client *client;\n \tchar *buf = val;\n+\tint ret;\n \n \tif (unlikely(!count))\n \t\treturn count;\n \n+\tclient = at24_translate_offset(at24, &off);\n+\n+\tret = pm_runtime_get_sync(&client->dev);\n+\tif (ret < 0) {\n+\t\tpm_runtime_put_noidle(&client->dev);\n+\t\tpm_runtime_put(&client->dev);\n+\t\treturn ret;\n+\t}\n+\n \t/*\n \t * Read data from chip, protecting against concurrent updates\n \t * from this host, but not from other I2C masters.\n@@ -527,17 +539,30 @@ static int at24_read(void *priv, unsigned int off, void *val, size_t count)\n \n \tmutex_unlock(&at24->lock);\n \n+\tpm_runtime_put(&client->dev);\n+\n \treturn 0;\n }\n \n static int at24_write(void *priv, unsigned int off, void *val, size_t count)\n {\n \tstruct at24_data *at24 = priv;\n+\tstruct i2c_client *client;\n \tchar *buf = val;\n+\tint ret;\n \n \tif (unlikely(!count))\n \t\treturn -EINVAL;\n \n+\tclient = at24_translate_offset(at24, &off);\n+\n+\tret = pm_runtime_get_sync(&client->dev);\n+\tif (ret < 0) {\n+\t\tpm_runtime_put_noidle(&client->dev);\n+\t\tpm_runtime_put(&client->dev);\n+\t\treturn ret;\n+\t}\n+\n \t/*\n \t * Write data to chip, protecting against concurrent updates\n \t * from this host, but not from other I2C masters.\n@@ -559,6 +584,8 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count)\n \n \tmutex_unlock(&at24->lock);\n \n+\tpm_runtime_put(&client->dev);\n+\n \treturn 0;\n }\n \n@@ -743,6 +770,15 @@ static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id)\n \n \ti2c_set_clientdata(client, at24);\n \n+\t/* enable runtime pm */\n+\tpm_runtime_get_noresume(&client->dev);\n+\terr = pm_runtime_set_active(&client->dev);\n+\tif (err < 0)\n+\t\tgoto err_clients;\n+\n+\tpm_runtime_enable(&client->dev);\n+\tpm_runtime_put(&client->dev);\n+\n \t/*\n \t * Perform a one-byte test read to verify that the\n \t * chip is functional.\n@@ -810,6 +846,9 @@ static int at24_remove(struct i2c_client *client)\n \tfor (i = 1; i < at24->num_addresses; i++)\n \t\ti2c_unregister_device(at24->client[i]);\n \n+\tpm_runtime_disable(&client->dev);\n+\tpm_runtime_set_suspended(&client->dev);\n+\n \treturn 0;\n }\n \n",
    "prefixes": [
        "v3",
        "3/3"
    ]
}