From patchwork Wed Jun 16 12:46:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 462546 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,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 0E87BC48BE8 for ; Wed, 16 Jun 2021 12:46:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E534C60FDB for ; Wed, 16 Jun 2021 12:46:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232879AbhFPMsO (ORCPT ); Wed, 16 Jun 2021 08:48:14 -0400 Received: from relay5-d.mail.gandi.net ([217.70.183.197]:57113 "EHLO relay5-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232950AbhFPMsF (ORCPT ); Wed, 16 Jun 2021 08:48:05 -0400 Received: (Authenticated sender: jacopo@jmondi.org) by relay5-d.mail.gandi.net (Postfix) with ESMTPSA id 9625A1C0010; Wed, 16 Jun 2021 12:45:56 +0000 (UTC) From: Jacopo Mondi To: Hans Verkuil , kieran.bingham+renesas@ideasonboard.com, laurent.pinchart+renesas@ideasonboard.com, niklas.soderlund+renesas@ragnatech.se, geert@linux-m68k.org Cc: Jacopo Mondi , Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Laurent Pinchart Subject: [PATCH v5 09/15] media: i2c: rdacm21: Fix OV10640 powerup Date: Wed, 16 Jun 2021 14:46:10 +0200 Message-Id: <20210616124616.49249-10-jacopo+renesas@jmondi.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210616124616.49249-1-jacopo+renesas@jmondi.org> References: <20210616124616.49249-1-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org The OV10640 image sensor powerdown signal is controlled by the first line of the OV490 GPIO pad #1, but the pad #0 identifier OV490_GPIO_OUTPUT_VALUE0 was erroneously used. As a result the image sensor powerdown signal was never asserted but was left floating and kept high by an internal pull-up resistor, causing sporadic failures during the image sensor startup phase. Fix this by using the correct GPIO pad identifier and wait the mandatory 1.5 millisecond delay after the powerup lane is asserted. The reset delay is not characterized in the chip manual if not as "255 XVCLK + initialization". Wait for at least 3 milliseconds to guarantee the SCCB bus is available. While at it also fix the reset sequence, as the reset line was released before the powerdown one, and the line was not cycled. This commit fixes a sporadic start-up error triggered by a failure to read the OV10640 chip ID: rdacm21 8-0054: OV10640 ID mismatch: (0x01) Fixes: a59f853b3b4b ("media: i2c: Add driver for RDACM21 camera module") Signed-off-by: Jacopo Mondi Reviewed-by: Kieran Bingham Reviewed-by: Laurent Pinchart --- drivers/media/i2c/rdacm21.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c index 6be8ce130e78..7c0a4a84340a 100644 --- a/drivers/media/i2c/rdacm21.c +++ b/drivers/media/i2c/rdacm21.c @@ -333,13 +333,19 @@ static int ov10640_initialize(struct rdacm21_device *dev) { u8 val; - /* Power-up OV10640 by setting RESETB and PWDNB pins high. */ + /* Enable GPIO0#0 (reset) and GPIO1#0 (pwdn) as output lines. */ ov490_write_reg(dev, OV490_GPIO_SEL0, OV490_GPIO0); ov490_write_reg(dev, OV490_GPIO_SEL1, OV490_SPWDN0); ov490_write_reg(dev, OV490_GPIO_DIRECTION0, OV490_GPIO0); ov490_write_reg(dev, OV490_GPIO_DIRECTION1, OV490_SPWDN0); + + /* Power up OV10640 and then reset it. */ + ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE1, OV490_SPWDN0); + usleep_range(1500, 3000); + + ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE0, 0x00); + usleep_range(1500, 3000); ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE0, OV490_GPIO0); - ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE0, OV490_SPWDN0); usleep_range(3000, 5000); /* Read OV10640 ID to test communications. */