From patchwork Fri Feb 5 13:25:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sakari Ailus X-Patchwork-Id: 377812 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28EA5C433E0 for ; Fri, 5 Feb 2021 22:48:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CDC1964E0F for ; Fri, 5 Feb 2021 22:48:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232435AbhBEWrl (ORCPT ); Fri, 5 Feb 2021 17:47:41 -0500 Received: from mga09.intel.com ([134.134.136.24]:26783 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229522AbhBEN2w (ORCPT ); Fri, 5 Feb 2021 08:28:52 -0500 IronPort-SDR: ftTHK/sOTyQ9MPA2pdg9ieH5kDU4lolvjPcKtw9jtMx5ECbHnvj2BdXHzE0+7Ls1yMhxZwbjU9 5MyJteJAwjeQ== X-IronPort-AV: E=McAfee;i="6000,8403,9885"; a="181578729" X-IronPort-AV: E=Sophos;i="5.81,154,1610438400"; d="scan'208";a="181578729" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Feb 2021 05:25:01 -0800 IronPort-SDR: RpsqP7/ztACPjxsOHS3FQ9XjZLHVCCAvCC+t5NWps+rak3kd8IjSyGTSdAyU9NeIQUi4UOi4jF CbskbWWBIORw== X-IronPort-AV: E=Sophos;i="5.81,154,1610438400"; d="scan'208";a="581148954" Received: from paasikivi.fi.intel.com ([10.237.72.42]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Feb 2021 05:24:58 -0800 Received: from punajuuri.localdomain (punajuuri.localdomain [192.168.240.130]) by paasikivi.fi.intel.com (Postfix) with ESMTP id A8082213E5; Fri, 5 Feb 2021 15:24:51 +0200 (EET) Received: from sailus by punajuuri.localdomain with local (Exim 4.92) (envelope-from ) id 1l816f-0005GU-F0; Fri, 05 Feb 2021 15:25:05 +0200 From: Sakari Ailus To: linux-i2c@vger.kernel.org Cc: Wolfram Sang , "Rafael J. Wysocki" , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Greg Kroah-Hartman , rajmohan.mani@intel.com, Tomasz Figa , Bartosz Golaszewski , Bingbu Cao , Chiranjeevi Rapolu , Hyungwoo Yang , linux-media@vger.kernel.org Subject: [PATCH v10 6/7] media: i2c: imx319: Support probe while the device is off Date: Fri, 5 Feb 2021 15:25:04 +0200 Message-Id: <20210205132505.20173-7-sakari.ailus@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210205132505.20173-1-sakari.ailus@linux.intel.com> References: <20210205132505.20173-1-sakari.ailus@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org From: Rajmohan Mani Tell ACPI device PM code that the driver supports the device being powered off when the driver's probe function is entered. Signed-off-by: Rajmohan Mani Signed-off-by: Sakari Ailus Reviewed-by: Tomasz Figa Reviewed-by: Bingbu Cao --- drivers/media/i2c/imx319.c | 72 +++++++++++++++++++++++--------------- 1 file changed, 44 insertions(+), 28 deletions(-) diff --git a/drivers/media/i2c/imx319.c b/drivers/media/i2c/imx319.c index 8473c0bbb35d6..e0b22e9318fed 100644 --- a/drivers/media/i2c/imx319.c +++ b/drivers/media/i2c/imx319.c @@ -140,6 +140,8 @@ struct imx319 { /* Streaming on/off */ bool streaming; + /* True if the device has been identified */ + bool identified; }; static const struct imx319_reg imx319_global_regs[] = { @@ -2084,6 +2086,31 @@ imx319_set_pad_format(struct v4l2_subdev *sd, return 0; } +/* Verify chip ID */ +static int imx319_identify_module(struct imx319 *imx319) +{ + struct i2c_client *client = v4l2_get_subdevdata(&imx319->sd); + int ret; + u32 val; + + if (imx319->identified) + return 0; + + ret = imx319_read_reg(imx319, IMX319_REG_CHIP_ID, 2, &val); + if (ret) + return ret; + + if (val != IMX319_CHIP_ID) { + dev_err(&client->dev, "chip id mismatch: %x!=%x", + IMX319_CHIP_ID, val); + return -EIO; + } + + imx319->identified = true; + + return 0; +} + /* Start streaming */ static int imx319_start_streaming(struct imx319 *imx319) { @@ -2091,6 +2118,10 @@ static int imx319_start_streaming(struct imx319 *imx319) const struct imx319_reg_list *reg_list; int ret; + ret = imx319_identify_module(imx319); + if (ret) + return ret; + /* Global Setting */ reg_list = &imx319_global_setting; ret = imx319_write_regs(imx319, reg_list->regs, reg_list->num_of_regs); @@ -2208,26 +2239,6 @@ static int __maybe_unused imx319_resume(struct device *dev) return ret; } -/* Verify chip ID */ -static int imx319_identify_module(struct imx319 *imx319) -{ - struct i2c_client *client = v4l2_get_subdevdata(&imx319->sd); - int ret; - u32 val; - - ret = imx319_read_reg(imx319, IMX319_REG_CHIP_ID, 2, &val); - if (ret) - return ret; - - if (val != IMX319_CHIP_ID) { - dev_err(&client->dev, "chip id mismatch: %x!=%x", - IMX319_CHIP_ID, val); - return -EIO; - } - - return 0; -} - static const struct v4l2_subdev_core_ops imx319_subdev_core_ops = { .subscribe_event = v4l2_ctrl_subdev_subscribe_event, .unsubscribe_event = v4l2_event_subdev_unsubscribe, @@ -2422,6 +2433,7 @@ static struct imx319_hwcfg *imx319_get_hwcfg(struct device *dev) static int imx319_probe(struct i2c_client *client) { struct imx319 *imx319; + bool low_power; int ret; u32 i; @@ -2434,11 +2446,14 @@ static int imx319_probe(struct i2c_client *client) /* Initialize subdev */ v4l2_i2c_subdev_init(&imx319->sd, client, &imx319_subdev_ops); - /* Check module identity */ - ret = imx319_identify_module(imx319); - if (ret) { - dev_err(&client->dev, "failed to find sensor: %d", ret); - goto error_probe; + low_power = acpi_dev_state_low_power(&client->dev); + if (!low_power) { + /* Check module identity */ + ret = imx319_identify_module(imx319); + if (ret) { + dev_err(&client->dev, "failed to find sensor: %d", ret); + goto error_probe; + } } imx319->hwcfg = imx319_get_hwcfg(&client->dev); @@ -2491,10 +2506,10 @@ static int imx319_probe(struct i2c_client *client) goto error_media_entity; /* - * Device is already turned on by i2c-core with ACPI domain PM. - * Enable runtime PM and turn off the device. + * Don't set the device's state to active if it's in a low power state. */ - pm_runtime_set_active(&client->dev); + if (!low_power) + pm_runtime_set_active(&client->dev); pm_runtime_enable(&client->dev); pm_runtime_idle(&client->dev); @@ -2547,6 +2562,7 @@ static struct i2c_driver imx319_i2c_driver = { }, .probe_new = imx319_probe, .remove = imx319_remove, + .flags = I2C_DRV_FL_ALLOW_LOW_POWER_PROBE, }; module_i2c_driver(imx319_i2c_driver);