From patchwork Thu Aug 10 09:06:45 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wenyou.Yang@microchip.com X-Patchwork-Id: 9893103 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2FE8B60236 for ; Thu, 10 Aug 2017 09:18:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 259ED28AAE for ; Thu, 10 Aug 2017 09:18:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1A78328AC1; Thu, 10 Aug 2017 09:18:49 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id EEAC928ADC for ; Thu, 10 Aug 2017 09:18:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc: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:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=HJnXoE6rI5XV7WmaUZKdCmNG811YYyTBxXI5fO7abFU=; b=d2gkbV2e2XBJxp Fxje0JDzAK2IcnMP7dvBI5smSEZjC27dG33AioYcSjm4tXHV3sLjBz9dPo0R4PmKVmmRd2H7ABT/M GCMC74Ywt0p1itPN29FDoKXZw+0WkA6hiYaBE83pp0LHGMXQ4WndCIzkjQ2cVyrSLSnsZCv+omHYB 1dQa+F1iYG2I4WlNmDSl5i1zJOjN14ONnna8GDQrBM0dmFV7FVqthjSrNkbmyqQCfuRZwh4klpyXm sFW8pzJ/DgtlYBBO4vlVfyBXqAc3mqedwQ5vu/RpaTxC+cME7/3nB30eGLnAD4PEZg0nHfohEOKZS X/PwOSe7VuJKOhhGo+SQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dfjc1-0006KL-Eo; Thu, 10 Aug 2017 09:18:41 +0000 Received: from eusmtp01.atmel.com ([212.144.249.243]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1dfjWj-0003Zq-Bn for linux-arm-kernel@lists.infradead.org; Thu, 10 Aug 2017 09:13:21 +0000 Received: from apsmtp01.atmel.com (10.168.254.30) by eusmtp01.atmel.com (10.145.145.31) with Microsoft SMTP Server id 14.3.235.1; Thu, 10 Aug 2017 11:12:35 +0200 Received: from shaarm01.corp.atmel.com (10.168.254.13) by apsmtp01.corp.atmel.com (10.168.254.30) with Microsoft SMTP Server id 14.3.235.1; Thu, 10 Aug 2017 17:15:39 +0800 From: Wenyou Yang To: Jonathan Corbet Subject: [PATCH 2/2] media: ov7670: Add the s_power operation Date: Thu, 10 Aug 2017 17:06:45 +0800 Message-ID: <20170810090645.24344-3-wenyou.yang@microchip.com> X-Mailer: git-send-email 2.13.0 In-Reply-To: <20170810090645.24344-1-wenyou.yang@microchip.com> References: <20170810090645.24344-1-wenyou.yang@microchip.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170810_021314_919584_5E31DD37 X-CRM114-Status: GOOD ( 11.46 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Wenyou Yang , linux-kernel@vger.kernel.org, Mauro Carvalho Chehab , linux-arm-kernel@lists.infradead.org, Linux Media Mailing List Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Add the s_power operation which is responsible for manipulating the power dowm mode through the PWDN pin and the reset operation through the RESET pin. Signed-off-by: Wenyou Yang --- drivers/media/i2c/ov7670.c | 30 +++++++++++++++++++++++++++--- 1 file changed, 27 insertions(+), 3 deletions(-) diff --git a/drivers/media/i2c/ov7670.c b/drivers/media/i2c/ov7670.c index 5c8460ee65c3..5ed79ccfaf91 100644 --- a/drivers/media/i2c/ov7670.c +++ b/drivers/media/i2c/ov7670.c @@ -1506,6 +1506,22 @@ static int ov7670_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_regis } #endif +static int ov7670_s_power(struct v4l2_subdev *sd, int on) +{ + struct ov7670_info *info = to_state(sd); + + if (info->pwdn_gpio) + gpiod_direction_output(info->pwdn_gpio, !on); + if (on && info->resetb_gpio) { + gpiod_set_value(info->resetb_gpio, 1); + usleep_range(500, 1000); + gpiod_set_value(info->resetb_gpio, 0); + usleep_range(3000, 5000); + } + + return 0; +} + /* ----------------------------------------------------------------------- */ static const struct v4l2_subdev_core_ops ov7670_core_ops = { @@ -1515,6 +1531,7 @@ static const struct v4l2_subdev_core_ops ov7670_core_ops = { .g_register = ov7670_g_register, .s_register = ov7670_s_register, #endif + .s_power = ov7670_s_power, }; static const struct v4l2_subdev_video_ops ov7670_video_ops = { @@ -1568,8 +1585,6 @@ static int ov7670_init_gpio(struct i2c_client *client, struct ov7670_info *info) return PTR_ERR(info->resetb_gpio); } - usleep_range(3000, 5000); - return 0; } @@ -1630,13 +1645,19 @@ static int ov7670_probe(struct i2c_client *client, goto clk_disable; } + ret = ov7670_init_gpio(client, info); + if (ret) + goto clk_disable; + + ov7670_s_power(sd, 1); + /* Make sure it's an ov7670 */ ret = ov7670_detect(sd); if (ret) { v4l_dbg(1, debug, client, "chip found @ 0x%x (%s) is not an ov7670 chip.\n", client->addr << 1, client->adapter->name); - goto clk_disable; + goto power_off; } v4l_info(client, "chip found @ 0x%02x (%s)\n", client->addr << 1, client->adapter->name); @@ -1708,6 +1729,8 @@ static int ov7670_probe(struct i2c_client *client, media_entity_cleanup(&info->sd.entity); hdl_free: v4l2_ctrl_handler_free(&info->hdl); +power_off: + ov7670_s_power(sd, 0); clk_disable: clk_disable_unprepare(info->clk); return ret; @@ -1723,6 +1746,7 @@ static int ov7670_remove(struct i2c_client *client) v4l2_ctrl_handler_free(&info->hdl); clk_disable_unprepare(info->clk); media_entity_cleanup(&info->sd.entity); + ov7670_s_power(sd, 0); return 0; }