From patchwork Thu Aug 3 09:33:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 709861 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 AC671C04A6A for ; Thu, 3 Aug 2023 09:35:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235112AbjHCJfl (ORCPT ); Thu, 3 Aug 2023 05:35:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33378 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235088AbjHCJfg (ORCPT ); Thu, 3 Aug 2023 05:35:36 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6467D3598 for ; Thu, 3 Aug 2023 02:34:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1691055255; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=cObHkZ504KWlHQpDz8Tf2YqZrc4/61AxKkqb5T0wBaI=; b=eKJ2I22kRas9HOgwTswtQrOsOcvKqJ4oomxZ8hT74ofR39sFc3gjpwIjiXGhL07UtqEnEs jqITTcj9CQd+FvIBgkb/7LnEqyMSbdi9I7ZVWlJiqfmWQvqTOQEhib8fk49xg5GO9NCmf1 1GK7i1JmZ2C5HbbyuKL0ZCLqbtVJf5w= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-609-xAerU9l3MMKJud3ZnihYRQ-1; Thu, 03 Aug 2023 05:34:11 -0400 X-MC-Unique: xAerU9l3MMKJud3ZnihYRQ-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 13A0E185A78B; Thu, 3 Aug 2023 09:34:11 +0000 (UTC) Received: from shalem.redhat.com (unknown [10.39.193.2]) by smtp.corp.redhat.com (Postfix) with ESMTP id A1F4D2166B25; Thu, 3 Aug 2023 09:34:09 +0000 (UTC) From: Hans de Goede To: Sakari Ailus , Laurent Pinchart , Rui Miguel Silva , Daniel Scally Cc: Hans de Goede , Mauro Carvalho Chehab , Andy Shevchenko , Kate Hsuan , Dave Stevenson , Tommaso Merciai , linux-media@vger.kernel.org Subject: [PATCH v5 12/32] media: ov2680: Check for "powerdown" GPIO con-id before checking for "reset" GPIO con-id Date: Thu, 3 Aug 2023 11:33:27 +0200 Message-ID: <20230803093348.15679-13-hdegoede@redhat.com> In-Reply-To: <20230803093348.15679-1-hdegoede@redhat.com> References: <20230803093348.15679-1-hdegoede@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org The datasheet of the OV2680 labels the single GPIO to put the sensor in powersaving mode as XSHUTDN aka shutdown, _not_ reset. This is important because some boards have standardized sensor connectors which allow connecting various sensor modules. These connectors have both reset and powerdown signals and the powerdown signal is routed to the OV2680's XSHUTDN pin. On x86/ACPI multiple Bay Trail, Cherry Trail, Sky Lake and Kaby Lake models have an OV2680 connected to the ISP2 / IPU3. On these devices the GPIOS are not described in DT instead the GPIOs are described with an Intel specific DSM which labels them as either powerdown or reset. Often this DSM returns both reset and powerdown pins even though the OV2680 has only 1 such pin. For the ov2680 driver to work on these devices it must use the GPIO with "powerdown" as con-id, matching the XSHUTDN name from the datasheet. As for why "powerdown" vs say "shutdown" the ACPI DSM -> con-id mapping code is shared, so we must use standardized names and currently all of the following sensor drivers already use "powerdown": adv7180, gc0310, isl7998x, ov02a10, ov2659, ov5640, ov5648, ov5670, ov5693, ov7670, ov772x, ov7740, ov8858, ov8865 and ov9650 . Where as the hi846 driver is the lonely standout using "shutdown". Try the "powerdown" con-id first to make things work, falling back to "reset" to keep existing DT setups working. Acked-by: Rui Miguel Silva Reviewed-by: Daniel Scally Signed-off-by: Hans de Goede --- drivers/media/i2c/ov2680.c | 29 ++++++++++++++++++++--------- 1 file changed, 20 insertions(+), 9 deletions(-) diff --git a/drivers/media/i2c/ov2680.c b/drivers/media/i2c/ov2680.c index bc0ca2927370..b912ae7a63da 100644 --- a/drivers/media/i2c/ov2680.c +++ b/drivers/media/i2c/ov2680.c @@ -97,7 +97,7 @@ struct ov2680_dev { u32 xvclk_freq; struct regulator_bulk_data supplies[OV2680_NUM_SUPPLIES]; - struct gpio_desc *reset_gpio; + struct gpio_desc *pwdn_gpio; struct mutex lock; /* protect members */ bool is_enabled; @@ -180,19 +180,19 @@ static inline struct v4l2_subdev *ctrl_to_sd(struct v4l2_ctrl *ctrl) static void ov2680_power_up(struct ov2680_dev *sensor) { - if (!sensor->reset_gpio) + if (!sensor->pwdn_gpio) return; - gpiod_set_value(sensor->reset_gpio, 0); + gpiod_set_value(sensor->pwdn_gpio, 0); usleep_range(5000, 10000); } static void ov2680_power_down(struct ov2680_dev *sensor) { - if (!sensor->reset_gpio) + if (!sensor->pwdn_gpio) return; - gpiod_set_value(sensor->reset_gpio, 1); + gpiod_set_value(sensor->pwdn_gpio, 1); usleep_range(5000, 10000); } @@ -336,7 +336,7 @@ static int ov2680_power_on(struct ov2680_dev *sensor) return ret; } - if (!sensor->reset_gpio) { + if (!sensor->pwdn_gpio) { ret = cci_write(sensor->regmap, OV2680_REG_SOFT_RESET, 0x01, NULL); if (ret != 0) { @@ -697,16 +697,27 @@ static int ov2680_check_id(struct ov2680_dev *sensor) static int ov2680_parse_dt(struct ov2680_dev *sensor) { struct device *dev = sensor->dev; + struct gpio_desc *gpio; int ret; - sensor->reset_gpio = devm_gpiod_get_optional(dev, "reset", - GPIOD_OUT_HIGH); - ret = PTR_ERR_OR_ZERO(sensor->reset_gpio); + /* + * The pin we want is named XSHUTDN in the datasheet. Linux sensor + * drivers have standardized on using "powerdown" as con-id name + * for powerdown or shutdown pins. Older DTB files use "reset", + * so fallback to that if there is no "powerdown" pin. + */ + gpio = devm_gpiod_get_optional(dev, "powerdown", GPIOD_OUT_HIGH); + if (!gpio) + gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + + ret = PTR_ERR_OR_ZERO(gpio); if (ret < 0) { dev_dbg(dev, "error while getting reset gpio: %d\n", ret); return ret; } + sensor->pwdn_gpio = gpio; + sensor->xvclk = devm_clk_get(dev, "xvclk"); if (IS_ERR(sensor->xvclk)) { dev_err(dev, "xvclk clock missing or invalid\n");