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=-5.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,USER_AGENT_MUTT 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 4D2FCC04AAC for ; Mon, 20 May 2019 14:52:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 22690216B7 for ; Mon, 20 May 2019 14:52:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=lunn.ch header.i=@lunn.ch header.b="rH4MGkXJ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392027AbfETOw2 (ORCPT ); Mon, 20 May 2019 10:52:28 -0400 Received: from vps0.lunn.ch ([185.16.172.187]:40524 "EHLO vps0.lunn.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732283AbfETOw1 (ORCPT ); Mon, 20 May 2019 10:52:27 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lunn.ch; s=20171124; h=In-Reply-To:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=OR15pTh8PFO24Zv20KODF6WGQGNAYqpGzpNwW8lu2Bo=; b=rH4MGkXJHTS2o50pH7iaU/CF3n OO3sTW15OBk/JpauvSShmMxCoCseHm4wc8OxuD/+yA+uox2hXWGzxRU5iAFwgdjHyi/MEKqPCxzjp +/8+/XKlMQ3OiFbXKT4o1BoTN4tHeU5+EEzKELb+FofkPr5CVj/Jk/BQIVIhEsH3NoTQ=; Received: from andrew by vps0.lunn.ch with local (Exim 4.89) (envelope-from ) id 1hSjeC-0000Cv-Td; Mon, 20 May 2019 16:52:16 +0200 Date: Mon, 20 May 2019 16:52:16 +0200 From: Andrew Lunn To: Sagar Shrikant Kadam Cc: robh+dt@kernel.org, mark.rutland@arm.com, peter@korsgaard.com, palmer@sifive.com, paul.walmsley@sifive.com, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v5 3/3] i2c-ocores: sifive: add polling mode workaround for FU540-C000 SoC. Message-ID: <20190520145216.GD22024@lunn.ch> References: <1558361478-4381-1-git-send-email-sagar.kadam@sifive.com> <1558361478-4381-4-git-send-email-sagar.kadam@sifive.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1558361478-4381-4-git-send-email-sagar.kadam@sifive.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 20, 2019 at 07:41:18PM +0530, Sagar Shrikant Kadam wrote: > The i2c-ocore driver already has a polling mode interface.But it needs > a workaround for FU540 Chipset on HiFive unleashed board (RevA00). > There is an erratum in FU540 chip that prevents interrupt driven i2c > transfers from working, and also the I2C controller's interrupt bit > cannot be cleared if set, due to this the existing i2c polling mode > interface added in mainline earlier doesn't work, and CPU stall's > infinitely, when-ever i2c transfer is initiated. > > Ref:previous polling mode support in mainline > > commit 69c8c0c0efa8 ("i2c: ocores: add polling interface") > > The workaround / fix under OCORES_FLAG_BROKEN_IRQ is particularly for > FU540-COOO SoC. > > Signed-off-by: Sagar Shrikant Kadam Much better, thanks. Reviewed-by: Andrew Lunn Andrew