From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from stcim.de ([78.46.90.227]:49574 "EHLO stcim.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728207AbeJGWrq (ORCPT ); Sun, 7 Oct 2018 18:47:46 -0400 From: Stefan Lengfeld To: wsa+renesas@sang-engineering.com Cc: linux-i2c@vger.kernel.org, linux-renesas-soc@vger.kernel.org, preid@electromag.com.au, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.or, j-keerthy@ti.com, t-kristo@ti.com, grygorii.strashko@ti.com, andriy.shevchenko@linux.intel.com Subject: [RFC PATCH 2/3] watchdog: da9062: avoid regmap in restart handler Date: Sun, 7 Oct 2018 17:39:36 +0200 Message-Id: <20181007153937.16787-3-contact@stefanchrist.eu> In-Reply-To: <20181007153937.16787-1-contact@stefanchrist.eu> References: <20180923202034.qugs4fxucj7h4vri@porty> <20181007153937.16787-1-contact@stefanchrist.eu> Sender: linux-renesas-soc-owner@vger.kernel.org List-ID: Using i2c_transfer() directly to set the shutdown bit is more reliable than using regmap in atomic contexts, because calls to 'schedule()' or 'sleep()' must be avoided in call code paths. Tested on a phyCORE-i.MX6 Solo board. Signed-off-by: Stefan Lengfeld --- drivers/mfd/da9062-core.c | 1 + drivers/watchdog/da9062_wdt.c | 17 +++++++++++++---- include/linux/mfd/da9062/core.h | 1 + 3 files changed, 15 insertions(+), 4 deletions(-) diff --git a/drivers/mfd/da9062-core.c b/drivers/mfd/da9062-core.c index 9f6105906c09..b6a01054ba0f 100644 --- a/drivers/mfd/da9062-core.c +++ b/drivers/mfd/da9062-core.c @@ -609,6 +609,7 @@ static int da9062_i2c_probe(struct i2c_client *i2c, i2c_set_clientdata(i2c, chip); chip->dev = &i2c->dev; + chip->i2c = i2c; if (!i2c->irq) { dev_err(chip->dev, "No IRQ configured\n"); diff --git a/drivers/watchdog/da9062_wdt.c b/drivers/watchdog/da9062_wdt.c index fe169d8e1fb2..ad6483d25f83 100644 --- a/drivers/watchdog/da9062_wdt.c +++ b/drivers/watchdog/da9062_wdt.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -152,12 +153,20 @@ static int da9062_wdt_restart(struct watchdog_device *wdd, unsigned long action, void *data) { struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd); + struct i2c_client *client = wdt->hw->i2c; + __u8 buf[3] = {DA9062AA_CONTROL_F, DA9062AA_SHUTDOWN_MASK, 0x0}; + struct i2c_msg msgs[1] = { + { + .addr = client->addr, + .flags = (client->flags & I2C_M_TEN), + .len = sizeof(buf), + .buf = buf, + } + }; int ret; - ret = regmap_write(wdt->hw->regmap, - DA9062AA_CONTROL_F, - DA9062AA_SHUTDOWN_MASK); - if (ret) + ret = i2c_transfer(client->adapter, msgs, sizeof(msgs)); + if (ret < 0) dev_alert(wdt->hw->dev, "Failed to shutdown (err = %d)\n", ret); diff --git a/include/linux/mfd/da9062/core.h b/include/linux/mfd/da9062/core.h index 74d33a01ddae..c994293b3aef 100644 --- a/include/linux/mfd/da9062/core.h +++ b/include/linux/mfd/da9062/core.h @@ -68,6 +68,7 @@ enum da9062_irqs { struct da9062 { struct device *dev; struct regmap *regmap; + struct i2c_client *i2c; struct regmap_irq_chip_data *regmap_irq; enum da9062_compatible_types chip_type; }; -- 2.16.4