From patchwork Wed Dec 15 11:08:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Cao, Bingbu" X-Patchwork-Id: 525708 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 451AEC433F5 for ; Wed, 15 Dec 2021 11:12:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241981AbhLOLMT (ORCPT ); Wed, 15 Dec 2021 06:12:19 -0500 Received: from mga14.intel.com ([192.55.52.115]:63314 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241963AbhLOLMQ (ORCPT ); Wed, 15 Dec 2021 06:12:16 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1639566736; x=1671102736; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=LEvdEP6VbQLXdwbGej7ww+xvYhpru80UVqBFLpRnufA=; b=LvNxDSCgnksn1h43HWzmrUov43nCFEZLhgrhhDVUJOmZl0v5q2UwkAhS IlnI6w0+PUFtkgvhI3QGvynDk5tihV1Z/Y/Y1RPvtFxSO8HquD/DvHiev 7a4GD+E0Yqi4cyR4qV7IEfOBcIVvVkiUJrPE+gIn9QAdIFiTdslC4dKA7 rs9fI3RdjabBx9P8iAROmheGu2PJvm2bBYMJzPfHex4dZz9cdX2oXKRAE EMzh7cgx3D/SnMm9uJUjW7I+YbszRvH2ko49OzCK3zOhX4ualJx/5p8AS ZnWG7KsJQs6Y2tzX/7B4gxkcgDVAPD8XaqaxdBtvC88IdkN/8ur7k03ML A==; X-IronPort-AV: E=McAfee;i="6200,9189,10198"; a="239424550" X-IronPort-AV: E=Sophos;i="5.88,207,1635231600"; d="scan'208";a="239424550" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Dec 2021 03:12:16 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,207,1635231600"; d="scan'208";a="661891544" Received: from ipu5-build.bj.intel.com ([10.238.232.188]) by fmsmga001.fm.intel.com with ESMTP; 15 Dec 2021 03:12:13 -0800 From: Bingbu Cao To: linux-media@vger.kernel.org, sakari.ailus@linux.intel.com, rafael@kernel.org Cc: shawnx.tu@intel.com, chiranjeevi.rapolu@intel.com, tfiga@chromium.org, senozhatsky@chromium.org, linux-kernel@vger.kernel.org, bingbu.cao@linux.intel.com Subject: [PATCH v2 2/6] media: ov5670: Support device probe in non-zero ACPI D state Date: Wed, 15 Dec 2021 19:08:59 +0800 Message-Id: <1639566543-8561-3-git-send-email-bingbu.cao@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1639566543-8561-1-git-send-email-bingbu.cao@intel.com> References: <1639566543-8561-1-git-send-email-bingbu.cao@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Sakari Ailus Tell ACPI device PM code that the driver supports the device being in non-zero ACPI D state when the driver's probe function is entered. Also do identification on the first access of the device, whether in probe or when starting streaming. Signed-off-by: Bingbu Cao Signed-off-by: Sakari Ailus --- drivers/media/i2c/ov5670.c | 78 +++++++++++++++++++++++++++------------------- 1 file changed, 46 insertions(+), 32 deletions(-) diff --git a/drivers/media/i2c/ov5670.c b/drivers/media/i2c/ov5670.c index 251f459ab484..5adf73cb88d4 100644 --- a/drivers/media/i2c/ov5670.c +++ b/drivers/media/i2c/ov5670.c @@ -1833,6 +1833,8 @@ struct ov5670 { /* Streaming on/off */ bool streaming; + /* True if the device has been identified */ + bool identified; }; #define to_ov5670(_sd) container_of(_sd, struct ov5670, sd) @@ -2273,6 +2275,32 @@ static int ov5670_get_skip_frames(struct v4l2_subdev *sd, u32 *frames) return 0; } +/* Verify chip ID */ +static int ov5670_identify_module(struct ov5670 *ov5670) +{ + struct i2c_client *client = v4l2_get_subdevdata(&ov5670->sd); + int ret; + u32 val; + + if (ov5670->identified) + return 0; + + ret = ov5670_read_reg(ov5670, OV5670_REG_CHIP_ID, + OV5670_REG_VALUE_24BIT, &val); + if (ret) + return ret; + + if (val != OV5670_CHIP_ID) { + dev_err(&client->dev, "chip id mismatch: %x!=%x\n", + OV5670_CHIP_ID, val); + return -ENXIO; + } + + ov5670->identified = true; + + return 0; +} + /* Prepare streaming by writing default values and customized values */ static int ov5670_start_streaming(struct ov5670 *ov5670) { @@ -2281,6 +2309,10 @@ static int ov5670_start_streaming(struct ov5670 *ov5670) int link_freq_index; int ret; + ret = ov5670_identify_module(ov5670); + if (ret) + return ret; + /* Get out of from software reset */ ret = ov5670_write_reg(ov5670, OV5670_REG_SOFTWARE_RST, OV5670_REG_VALUE_08BIT, OV5670_SOFTWARE_RST); @@ -2400,27 +2432,6 @@ static int __maybe_unused ov5670_resume(struct device *dev) return 0; } -/* Verify chip ID */ -static int ov5670_identify_module(struct ov5670 *ov5670) -{ - struct i2c_client *client = v4l2_get_subdevdata(&ov5670->sd); - int ret; - u32 val; - - ret = ov5670_read_reg(ov5670, OV5670_REG_CHIP_ID, - OV5670_REG_VALUE_24BIT, &val); - if (ret) - return ret; - - if (val != OV5670_CHIP_ID) { - dev_err(&client->dev, "chip id mismatch: %x!=%x\n", - OV5670_CHIP_ID, val); - return -ENXIO; - } - - return 0; -} - static const struct v4l2_subdev_core_ops ov5670_core_ops = { .log_status = v4l2_ctrl_subdev_log_status, .subscribe_event = v4l2_ctrl_subdev_subscribe_event, @@ -2462,6 +2473,7 @@ static int ov5670_probe(struct i2c_client *client) struct ov5670 *ov5670; const char *err_msg; u32 input_clk = 0; + bool full_power; int ret; device_property_read_u32(&client->dev, "clock-frequency", &input_clk); @@ -2478,11 +2490,14 @@ static int ov5670_probe(struct i2c_client *client) /* Initialize subdev */ v4l2_i2c_subdev_init(&ov5670->sd, client, &ov5670_subdev_ops); - /* Check module identity */ - ret = ov5670_identify_module(ov5670); - if (ret) { - err_msg = "ov5670_identify_module() error"; - goto error_print; + full_power = acpi_dev_state_d0(&client->dev); + if (full_power) { + /* Check module identity */ + ret = ov5670_identify_module(ov5670); + if (ret) { + err_msg = "ov5670_identify_module() error"; + goto error_print; + } } mutex_init(&ov5670->mutex); @@ -2519,11 +2534,9 @@ static int ov5670_probe(struct i2c_client *client) ov5670->streaming = false; - /* - * Device is already turned on by i2c-core with ACPI domain PM. - * Enable runtime PM and turn off the device. - */ - pm_runtime_set_active(&client->dev); + /* Set the device's state to active if it's in D0 state. */ + if (full_power) + pm_runtime_set_active(&client->dev); pm_runtime_enable(&client->dev); pm_runtime_idle(&client->dev); @@ -2565,7 +2578,7 @@ static const struct dev_pm_ops ov5670_pm_ops = { #ifdef CONFIG_ACPI static const struct acpi_device_id ov5670_acpi_ids[] = { - {"INT3479"}, + { "INT3479" }, { /* sentinel */ } }; @@ -2580,6 +2593,7 @@ static struct i2c_driver ov5670_i2c_driver = { }, .probe_new = ov5670_probe, .remove = ov5670_remove, + .flags = I2C_DRV_ACPI_WAIVE_D0_PROBE, }; module_i2c_driver(ov5670_i2c_driver);