From patchwork Wed Jan 27 17:46:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 12050725 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=-17.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,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 89F77C433E0 for ; Wed, 27 Jan 2021 17:48:36 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1954A64DA8 for ; Wed, 27 Jan 2021 17:48:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1954A64DA8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe :List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:To:From: Reply-To:Cc:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=xFyOS5eUNkdhR+HV6JIPJB/qCtnu+wT+TtLd+s3GVIs=; b=YeM4Dkyp4XGMcl+e8l8Z/DA9S5 JOFLMRSxJZ090rPs12P3ImK0X2OpWzCjcmjEfOqa2DD1hWlb9ymY7fEBucUmdw6HoUCfs6Si4vy7m I+/Oq0IKGFESBQPbdCxaKYOJRuGZR+oK5J8syOrvHSuEosGbMLk4fMlqrWagVl70LbOqFwKEdkCOX RVk87osVE/cYomUJTB/u/v8yJG9TXqoHsJfht212HUsO+b90Hg25Wl7M5si5+kq3lT5s06gRzT6uz GUH05PBcN+eniabHa+lPTc5CR6mI0Jkjq/xfCdJLS3Xx0DpMyXEZpmbO63o8PQrcDYVSvb/T5IE/Q gwrgp7Tg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l4ouT-00036U-Ei; Wed, 27 Jan 2021 17:47:17 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l4ou0-0002x2-G3 for linux-arm-kernel@lists.infradead.org; Wed, 27 Jan 2021 17:46:50 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 39A0C64DAC; Wed, 27 Jan 2021 17:46:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1611769607; bh=hvO4AqTEzf34evOjNGv/VdbBc5+wBs7kWrb33Xxpmo8=; h=From:To:Subject:Date:In-Reply-To:References:From; b=sXMrIvpsM3fXd27A5BLOQ8QShiQrzWV0FsPIRevj1nAKytaHuosjUFazNmMH+pIcR swqkPVetLAWUaUP+g+duhApa8ADVsFoRCR1Qz77qgP5Cu3+2L8cJOuWg4iQOLWFVby b5gPEFCc4rNUYBOgXbbTLAcwsucZilJtVHQJjvUaIR8cbVCfr9AqyYRPjopwHasmr+ gXFvVrV8joAZQGg5vaEsR2BthWyrH5yIEtjro348B/ds/y3Igj9fHlNW9p0lFqfYdz sx9m5tlfCOaP6wD3B3jfVRHJvzimAT1PEfPfA9JEtw4UDsoTMumav1+ZSyMD6mKakt R09EsUG2rSVQw== From: Krzysztof Kozlowski To: Sakari Ailus , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v7 4/4] media: i2c: imx258: get clock from device properties and enable it via runtime PM Date: Wed, 27 Jan 2021 18:46:35 +0100 Message-Id: <20210127174635.3596-4-krzk@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210127174635.3596-1-krzk@kernel.org> References: <20210127174635.3596-1-krzk@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210127_124648_771423_5F8B09B7 X-CRM114-Status: GOOD ( 22.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The IMX258 sensor driver checked in device properties for a clock-frequency property which actually does not mean that the clock is really running such frequency or is it even enabled. Get the provided clock and check it frequency. If none is provided, fall back to old property. Enable the clock when accessing the IMX258 registers and when streaming starts with runtime PM. Signed-off-by: Krzysztof Kozlowski --- Changes since v6: 1. None Changes since v5: 1. Move clk_get_rate() out of else block. Changes since v4: 1. Add missing imx258_power_off. Changes since v3: 1. None Changes since v2: 1. Do not try to set drvdata, wrap lines. 2. Use dev_dbg. Changes since v1: 1. Use runtime PM for clock toggling --- drivers/media/i2c/imx258.c | 69 +++++++++++++++++++++++++++++++++----- 1 file changed, 61 insertions(+), 8 deletions(-) diff --git a/drivers/media/i2c/imx258.c b/drivers/media/i2c/imx258.c index 505981e02cff..61d74b794582 100644 --- a/drivers/media/i2c/imx258.c +++ b/drivers/media/i2c/imx258.c @@ -2,6 +2,7 @@ // Copyright (C) 2018 Intel Corporation #include +#include #include #include #include @@ -68,6 +69,9 @@ #define REG_CONFIG_MIRROR_FLIP 0x03 #define REG_CONFIG_FLIP_TEST_PATTERN 0x02 +/* Input clock frequency in Hz */ +#define IMX258_INPUT_CLOCK_FREQ 19200000 + struct imx258_reg { u16 address; u8 val; @@ -610,6 +614,8 @@ struct imx258 { /* Streaming on/off */ bool streaming; + + struct clk *clk; }; static inline struct imx258 *to_imx258(struct v4l2_subdev *_sd) @@ -972,6 +978,29 @@ static int imx258_stop_streaming(struct imx258 *imx258) return 0; } +static int imx258_power_on(struct device *dev) +{ + struct v4l2_subdev *sd = dev_get_drvdata(dev); + struct imx258 *imx258 = to_imx258(sd); + int ret; + + ret = clk_prepare_enable(imx258->clk); + if (ret) + dev_err(dev, "failed to enable clock\n"); + + return ret; +} + +static int imx258_power_off(struct device *dev) +{ + struct v4l2_subdev *sd = dev_get_drvdata(dev); + struct imx258 *imx258 = to_imx258(sd); + + clk_disable_unprepare(imx258->clk); + + return 0; +} + static int imx258_set_stream(struct v4l2_subdev *sd, int enable) { struct imx258 *imx258 = to_imx258(sd); @@ -1199,9 +1228,26 @@ static int imx258_probe(struct i2c_client *client) int ret; u32 val = 0; - device_property_read_u32(&client->dev, "clock-frequency", &val); - if (val != 19200000) + imx258 = devm_kzalloc(&client->dev, sizeof(*imx258), GFP_KERNEL); + if (!imx258) + return -ENOMEM; + + imx258->clk = devm_clk_get_optional(&client->dev, NULL); + if (!imx258->clk) { + dev_dbg(&client->dev, + "no clock provided, using clock-frequency property\n"); + + device_property_read_u32(&client->dev, "clock-frequency", &val); + if (val != IMX258_INPUT_CLOCK_FREQ) + return -EINVAL; + } else if (IS_ERR(imx258->clk)) { + return dev_err_probe(&client->dev, PTR_ERR(imx258->clk), + "error getting clock\n"); + } + if (clk_get_rate(imx258->clk) != IMX258_INPUT_CLOCK_FREQ) { + dev_err(&client->dev, "input clock frequency not supported\n"); return -EINVAL; + } /* * Check that the device is mounted upside down. The driver only @@ -1211,24 +1257,25 @@ static int imx258_probe(struct i2c_client *client) if (ret || val != 180) return -EINVAL; - imx258 = devm_kzalloc(&client->dev, sizeof(*imx258), GFP_KERNEL); - if (!imx258) - return -ENOMEM; - /* Initialize subdev */ v4l2_i2c_subdev_init(&imx258->sd, client, &imx258_subdev_ops); + /* Will be powered off via pm_runtime_idle */ + ret = imx258_power_on(&client->dev); + if (ret) + return ret; + /* Check module identity */ ret = imx258_identify_module(imx258); if (ret) - return ret; + goto error_identify; /* Set default mode to max resolution */ imx258->cur_mode = &supported_modes[0]; ret = imx258_init_controls(imx258); if (ret) - return ret; + goto error_identify; /* Initialize subdev */ imx258->sd.internal_ops = &imx258_internal_ops; @@ -1258,6 +1305,9 @@ static int imx258_probe(struct i2c_client *client) error_handler_free: imx258_free_controls(imx258); +error_identify: + imx258_power_off(&client->dev); + return ret; } @@ -1271,6 +1321,8 @@ static int imx258_remove(struct i2c_client *client) imx258_free_controls(imx258); pm_runtime_disable(&client->dev); + if (!pm_runtime_status_suspended(&client->dev)) + imx258_power_off(&client->dev); pm_runtime_set_suspended(&client->dev); return 0; @@ -1278,6 +1330,7 @@ static int imx258_remove(struct i2c_client *client) static const struct dev_pm_ops imx258_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(imx258_suspend, imx258_resume) + SET_RUNTIME_PM_OPS(imx258_power_off, imx258_power_on, NULL) }; #ifdef CONFIG_ACPI