From mboxrd@z Thu Jan 1 00:00:00 1970 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=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 CD078C433F7 for ; Tue, 14 Jul 2020 19:12:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A145C221ED for ; Tue, 14 Jul 2020 19:12:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594753963; bh=X8FtHlrJyDItUnN69QmMhvloGFJsAWkk0V7AsUpQpVk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SWTlHUwrDgoZ9DntkNyxu0GG24OO/WwAwUlafpeL4bLwuf9TD/sTKfbpjPGVx+ukK f79P2Vdd+WurNV+b2ziEK1k+1T/HVCqTFksMZZE3pyii5LFzHGHsnnel6mSqisBDkv CQvI1X5bFqFZANXCar3mZkGZ1J9QDeM78hFg8Se8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730254AbgGNTMm (ORCPT ); Tue, 14 Jul 2020 15:12:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:41484 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729556AbgGNSql (ORCPT ); Tue, 14 Jul 2020 14:46:41 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2D88722AAB; Tue, 14 Jul 2020 18:46:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594752400; bh=X8FtHlrJyDItUnN69QmMhvloGFJsAWkk0V7AsUpQpVk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AJH8fIGN1Ke2NnV+zPEx6S+DlL565wa7/NQGjlNFpkGTrticrSjZEp52HTWBFCrgC QRTv019lei+V+4z+9tbv/H6WjUlfTYa91hw5NpRzhd9CUv6QiufP3np48jyRLIB/Dt JQ3ogkjnw/PBZLikv84upooTMWZN4rZDgrqQoYEc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, maemo-leste@lists.dyne.org, Merlijn Wajer , Pavel Machek , Sebastian Reichel , Tony Lindgren , Sasha Levin Subject: [PATCH 4.19 07/58] ARM: dts: omap4-droid4: Fix spi configuration and increase rate Date: Tue, 14 Jul 2020 20:43:40 +0200 Message-Id: <20200714184056.498066895@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200714184056.149119318@linuxfoundation.org> References: <20200714184056.149119318@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tony Lindgren [ Upstream commit 0df12a01f4857495816b05f048c4c31439446e35 ] We can currently sometimes get "RXS timed out" errors and "EOT timed out" errors with spi transfers. These errors can be made easy to reproduce by reading the cpcap iio values in a loop while keeping the CPUs busy by also reading /dev/urandom. The "RXS timed out" errors we can fix by adding spi-cpol and spi-cpha in addition to the spi-cs-high property we already have. The "EOT timed out" errors we can fix by increasing the spi clock rate to 9.6 MHz. Looks similar MC13783 PMIC says it works at spi clock rates up to 20 MHz, so let's assume we can pick any rate up to 20 MHz also for cpcap. Cc: maemo-leste@lists.dyne.org Cc: Merlijn Wajer Cc: Pavel Machek Cc: Sebastian Reichel Signed-off-by: Tony Lindgren Signed-off-by: Sasha Levin --- arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi b/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi index f57acf8f66b95..75de8134b1d1f 100644 --- a/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi +++ b/arch/arm/boot/dts/motorola-cpcap-mapphone.dtsi @@ -16,8 +16,10 @@ #interrupt-cells = <2>; #address-cells = <1>; #size-cells = <0>; - spi-max-frequency = <3000000>; + spi-max-frequency = <9600000>; spi-cs-high; + spi-cpol; + spi-cpha; cpcap_adc: adc { compatible = "motorola,mapphone-cpcap-adc"; -- 2.25.1