From patchwork Sun May 24 19:24:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 200103 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=-9.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 6EAA2C433E1 for ; Sun, 24 May 2020 19:25:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4C41020825 for ; Sun, 24 May 2020 19:25:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="bXZUmt4Q" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387755AbgEXTZp (ORCPT ); Sun, 24 May 2020 15:25:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37526 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388250AbgEXTZo (ORCPT ); Sun, 24 May 2020 15:25:44 -0400 Received: from mail-lf1-x144.google.com (mail-lf1-x144.google.com [IPv6:2a00:1450:4864:20::144]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 66EDAC08C5C0 for ; Sun, 24 May 2020 12:25:43 -0700 (PDT) Received: by mail-lf1-x144.google.com with SMTP id x22so9383929lfd.4 for ; Sun, 24 May 2020 12:25:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=cA0rxP4uX8r0J5dTgAkrFDikDC5/+iYQEYBegCVDUX8=; b=bXZUmt4Q97nbHMur0+wddhj6NHibdNegK7WYEBHb3FXq/cXll1GDGCXmku19BFj5Nv AcWpGD1X351yyzB/DqYBq+8mBFu/9qUShZ/hNApIK/U6hgV0yj+5azJO1hbH2k+eGM17 C8D0jT6d+q8N1+XN67HUr0foWANMbTV/C3yJElLdOIEhjVmNbzaYplzsxINkXKKjSrZC +FTaMiqnHoM1cU8EyhRdDSF+Gcfv/daIYVmennTR/D/Bhr5GLZPL5fL+mbRsoYEG4GiI arQy37b7UuNXnMroZHstTyInswcMLqrzyvk4ECcYUGfayRJd+UoigQu2fAxTY6HqVbmu caqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=cA0rxP4uX8r0J5dTgAkrFDikDC5/+iYQEYBegCVDUX8=; b=L6rSNnSpVtoEdiwq42M+X2WzuyhCh+4TPvCDqGOv/3AKAAUQaBFHoA2/JtKDAa5VFT H7o/VWph4xvKlOilhChAEO0zEwp7j/aSoRJH/T5vT1maX3n2xpDxwsyuQI5frZzcbVVA wu18SlJZ7K3dwb+d/0sXF7PNs+HEs2xxeikgduTI+Lo8XIWgVz8NL1lpBR5apTEhKx/b WPMUHsnYrSn5FC7yMhBC2nQUNx8iPwpidlhZazM85Sfwyf85KESX6RDAx2CnPxan+8aV uZnk8Bx22aDlOOciB6U/x7Gfka9TY4D8hgXAbD07zEa+h5AW34O9e16YcpReOZkXBioz MqZg== X-Gm-Message-State: AOAM533KWIzuAO4C7dc+2ub2/rkb1FBrbOzBQ+kEy45W0isOFNRPdZ0H r4Vsx5hrexg1xU/fmc3OFx3Kww== X-Google-Smtp-Source: ABdhPJx0C0ywxASkq6HnfsazUJ4P8BtoLgib8fabRATVLYdBjqfrmIXTOinQ/nOYpw6Gk5h9DHeF+w== X-Received: by 2002:ac2:4143:: with SMTP id c3mr12541402lfi.131.1590348341928; Sun, 24 May 2020 12:25:41 -0700 (PDT) Received: from localhost.localdomain (37-144-159-139.broadband.corbina.ru. [37.144.159.139]) by smtp.googlemail.com with ESMTPSA id v10sm3878137lja.23.2020.05.24.12.25.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 24 May 2020 12:25:41 -0700 (PDT) From: Andrey Konovalov To: mchehab@kernel.org, sakari.ailus@iki.fi, manivannan.sadhasivam@linaro.org Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, c.barrett@framos.com, a.brela@framos.com, peter.griffin@linaro.org, Andrey Konovalov Subject: [PATCH v3 03/10] media: i2c: imx290: fix reset GPIO pin handling Date: Sun, 24 May 2020 22:24:58 +0300 Message-Id: <20200524192505.20682-4-andrey.konovalov@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200524192505.20682-1-andrey.konovalov@linaro.org> References: <20200524192505.20682-1-andrey.konovalov@linaro.org> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org According to https://www.kernel.org/doc/Documentation/gpio/consumer.txt, - all of the gpiod_set_value_xxx() functions operate with the *logical* value. So in imx290_power_on() the reset signal should be cleared/de-asserted with gpiod_set_value_cansleep(imx290->rst_gpio, 0), and in imx290_power_off() the value of 1 must be used to apply/assert the reset to the sensor. In the device tree the reset pin is described as GPIO_ACTIVE_LOW, and gpiod_set_value_xxx() functions take this into account, - when devm_gpiod_get_optional() is called with GPIOD_ASIS, the GPIO is not initialized, and the direction must be set later; using a GPIO without setting its direction first is illegal and will result in undefined behavior. Fix this by using GPIOD_OUT_HIGH instead of GPIOD_ASIS (this asserts the reset signal to the sensor initially). Signed-off-by: Andrey Konovalov Reviewed-by: Manivannan Sadhasivam --- drivers/media/i2c/imx290.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c index d0322f9a8856..7b1de1f0c8b7 100644 --- a/drivers/media/i2c/imx290.c +++ b/drivers/media/i2c/imx290.c @@ -628,7 +628,7 @@ static int imx290_power_on(struct device *dev) } usleep_range(1, 2); - gpiod_set_value_cansleep(imx290->rst_gpio, 1); + gpiod_set_value_cansleep(imx290->rst_gpio, 0); usleep_range(30000, 31000); return 0; @@ -641,7 +641,7 @@ static int imx290_power_off(struct device *dev) struct imx290 *imx290 = to_imx290(sd); clk_disable_unprepare(imx290->xclk); - gpiod_set_value_cansleep(imx290->rst_gpio, 0); + gpiod_set_value_cansleep(imx290->rst_gpio, 1); regulator_bulk_disable(IMX290_NUM_SUPPLIES, imx290->supplies); return 0; @@ -757,7 +757,8 @@ static int imx290_probe(struct i2c_client *client) goto free_err; } - imx290->rst_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_ASIS); + imx290->rst_gpio = devm_gpiod_get_optional(dev, "reset", + GPIOD_OUT_HIGH); if (IS_ERR(imx290->rst_gpio)) { dev_err(dev, "Cannot get reset gpio\n"); ret = PTR_ERR(imx290->rst_gpio);