From patchwork Mon Mar 15 13:15:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacopo Mondi X-Patchwork-Id: 402117 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, 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 E50C7C433DB for ; Mon, 15 Mar 2021 13:16:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9C71364EF1 for ; Mon, 15 Mar 2021 13:16:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231191AbhCONP6 (ORCPT ); Mon, 15 Mar 2021 09:15:58 -0400 Received: from relay9-d.mail.gandi.net ([217.70.183.199]:45213 "EHLO relay9-d.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230127AbhCONP3 (ORCPT ); Mon, 15 Mar 2021 09:15:29 -0400 X-Originating-IP: 79.22.58.175 Received: from uno.homenet.telecomitalia.it (host-79-22-58-175.retail.telecomitalia.it [79.22.58.175]) (Authenticated sender: jacopo@jmondi.org) by relay9-d.mail.gandi.net (Postfix) with ESMTPSA id 4CF98FF80E; Mon, 15 Mar 2021 13:15:24 +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 v2 12/18] media: i2c: rdacm21: Give more time to OV490 to boot Date: Mon, 15 Mar 2021 14:15:06 +0100 Message-Id: <20210315131512.133720-13-jacopo+renesas@jmondi.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210315131512.133720-1-jacopo+renesas@jmondi.org> References: <20210315131512.133720-1-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org It has been observed through repeated testing (250 boots) that in the 10% of the cases the RDACM21 initialization sequence errors out due a timeout waiting for the OV490 firmware to complete its boot phase. Albeit being the current timeout relatively large (300-600 milliseconds), doubling it reduces the sporadic error rate down to 1 over an 80 boot sequences test run. The firmware boot delay is unfortunately not characterized in the camera module manual. Fixes: a59f853b3b4b ("media: i2c: Add driver for RDACM21 camera module") Signed-off-by: Jacopo Mondi --- drivers/media/i2c/rdacm21.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c index 50a9b0d8255d..07cf077d8efd 100644 --- a/drivers/media/i2c/rdacm21.c +++ b/drivers/media/i2c/rdacm21.c @@ -53,7 +53,7 @@ #define OV490_PID 0x8080300a #define OV490_VER 0x8080300b #define OV490_PID_TIMEOUT 20 -#define OV490_OUTPUT_EN_TIMEOUT 300 +#define OV490_OUTPUT_EN_TIMEOUT 600 #define OV490_GPIO0 BIT(0) #define OV490_SPWDN0 BIT(0)