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,URIBL_BLOCKED,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 43C03C282CE for ; Wed, 22 May 2019 19:45:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 159782081C for ; Wed, 22 May 2019 19:45:43 +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="ZDl33/CA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387843AbfEVTpm (ORCPT ); Wed, 22 May 2019 15:45:42 -0400 Received: from vps0.lunn.ch ([185.16.172.187]:43775 "EHLO vps0.lunn.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387826AbfEVTpk (ORCPT ); Wed, 22 May 2019 15:45:40 -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=XNbOGS4rvkgdUZMHxmhjwr36ofxZ/LCzsygeLRYsvOg=; b=ZDl33/CAORcP7yl3ULlzFAQI8L JOJdOn2+59ezvFK21YTIlmlziHliJKAvIV1dqoBczKcThUkRms3/jx7OJSNEKejqWgnGB92gCidUb /yMZQQkxp14fp+ZmkJx0s4hl1yK44PjIQ1AUMKXgcUNOGjwFiKH37iwAZ4N2HT09W3sM=; Received: from andrew by vps0.lunn.ch with local (Exim 4.89) (envelope-from ) id 1hTXB3-0003JC-Ds; Wed, 22 May 2019 21:45:29 +0200 Date: Wed, 22 May 2019 21:45:29 +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 v7 3/3] i2c-ocores: sifive: add polling mode workaround for FU540-C000 SoC. Message-ID: <20190522194529.GJ7281@lunn.ch> References: <1558515574-11155-1-git-send-email-sagar.kadam@sifive.com> <1558515574-11155-4-git-send-email-sagar.kadam@sifive.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1558515574-11155-4-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 Wed, May 22, 2019 at 02:29:34PM +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: > commit dd7dbf0eb090 ("i2c: ocores: refactor setup for polling") > > The workaround / fix under OCORES_FLAG_BROKEN_IRQ is particularly for > FU540-COOO SoC. > > The polling function identifies a SiFive device based on the device node > and enables the workaround. > > Signed-off-by: Sagar Shrikant Kadam Reviewed-by: Andrew Lunn Andrew