From patchwork Tue Feb 16 17:41:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 12090437 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 372DAC43331 for ; Tue, 16 Feb 2021 17:42:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 09F5A64DA1 for ; Tue, 16 Feb 2021 17:42:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231241AbhBPRms (ORCPT ); Tue, 16 Feb 2021 12:42:48 -0500 Received: from relay12.mail.gandi.net ([217.70.178.232]:49305 "EHLO relay12.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231200AbhBPRmZ (ORCPT ); Tue, 16 Feb 2021 12:42:25 -0500 Received: from uno.lan (93-34-118-233.ip49.fastwebnet.it [93.34.118.233]) (Authenticated sender: jacopo@jmondi.org) by relay12.mail.gandi.net (Postfix) with ESMTPSA id 5DFDC200014; Tue, 16 Feb 2021 17:41:42 +0000 (UTC) From: Jacopo Mondi To: 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 Subject: [PATCH 09/16] media: i2c: rdacm21: Re-work OV10640 initialization Date: Tue, 16 Feb 2021 18:41:39 +0100 Message-Id: <20210216174146.106639-10-jacopo+renesas@jmondi.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210216174146.106639-1-jacopo+renesas@jmondi.org> References: <20210216174146.106639-1-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org The OV10640 image sensor reset and powerdown on signals are controlled by the embedded OV490 ISP. The current reset procedure does not respect the 1 millisecond power-up delay and releases the reset signal before the powerdown one. Fix the OV10640 power up sequence by releasing the powerdown signal, waiting the mandatory 1 millisecond power up delay and then releasing the reset signal. 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. 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) Signed-off-by: Jacopo Mondi --- drivers/media/i2c/rdacm21.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c index b22a2ca5340b..c420a6b96879 100644 --- a/drivers/media/i2c/rdacm21.c +++ b/drivers/media/i2c/rdacm21.c @@ -333,13 +333,15 @@ static int ov10640_initialize(struct rdacm21_device *dev) { u8 val; - /* Power-up OV10640 by setting RESETB and PWDNB pins high. */ + /* Power-up OV10640 by setting PWDNB and RESETB pins high. */ 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); - ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE0, OV490_GPIO0); + ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE0, OV490_SPWDN0); + usleep_range(1500, 3000); + ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE0, OV490_GPIO0); usleep_range(3000, 5000); /* Read OV10640 ID to test communications. */