From patchwork Tue Nov 9 08:48:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bingbu Cao X-Patchwork-Id: 12610125 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 59A8AC433EF for ; Tue, 9 Nov 2021 08:52:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3EDBA61027 for ; Tue, 9 Nov 2021 08:52:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244542AbhKIIzI (ORCPT ); Tue, 9 Nov 2021 03:55:08 -0500 Received: from mga18.intel.com ([134.134.136.126]:10464 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244536AbhKIIzI (ORCPT ); Tue, 9 Nov 2021 03:55:08 -0500 X-IronPort-AV: E=McAfee;i="6200,9189,10162"; a="219306240" X-IronPort-AV: E=Sophos;i="5.87,219,1631602800"; d="scan'208";a="219306240" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Nov 2021 00:52:22 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.87,219,1631602800"; d="scan'208";a="491585324" Received: from ipu5-build.bj.intel.com ([10.238.232.188]) by orsmga007.jf.intel.com with ESMTP; 09 Nov 2021 00:52:17 -0800 From: Bingbu Cao To: linux-media@vger.kernel.org, sakari.ailus@linux.intel.com, rafael@kernel.org Cc: shawnx.tu@intel.com, tian.shu.qiu@intel.com, chiranjeevi.rapolu@intel.com, hyungwoo.yang@intel.com, tfiga@chromium.org, senozhatsky@chromium.org, linux-kernel@vger.kernel.org, bingbu.cao@intel.com, bingbu.cao@linux.intel.com Subject: [PATCH 2/6] media: ov5670: Support device probe in non-zero ACPI D state Date: Tue, 9 Nov 2021 16:48:31 +0800 Message-Id: <1636447715-15526-3-git-send-email-bingbu.cao@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1636447715-15526-1-git-send-email-bingbu.cao@intel.com> References: <1636447715-15526-1-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);