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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 74610C4167B for ; Fri, 3 Nov 2023 11:59:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346234AbjKCL7x (ORCPT ); Fri, 3 Nov 2023 07:59:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47202 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229486AbjKCL7v (ORCPT ); Fri, 3 Nov 2023 07:59:51 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A1712D4D; Fri, 3 Nov 2023 04:59:48 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D4F09C433C9; Fri, 3 Nov 2023 11:59:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699012788; bh=lp4m60Y8QS5W5e92yJb9zzs6N/q4MC9uOyBnUUdzA8w=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=IvJYhrAOB+gburM95X5rz4m8nQPW5zZQaCKrQrHl56J7gDEa9q9Gzw9LD4dkvon4z qWrdP+tEMmiC6We1WiHFJ99lvxv4F6RH/m95klTwzaB1GuAoP6YUD94YsOhhVZuTAR nIydAJRGxfkRM6uwPKIkZX082TCv7DBju45d4Ckor/vq8+rGAsA0qD3ABLiCOCOvKA r6TJTcSW3EKRSx8Pr2/FtoqIaRqrvwyCEIPApbKlj60dZKob0nXlI32k+VeFNhxysn RMuL1X4HmVbg6fhhEjC+kbteGBPnSPOFyezgp5VM3CMKBsTYcEZRrJYsxtuR7xSiS/ QJ87ERYUaRjJw== Message-ID: Date: Fri, 3 Nov 2023 12:59:45 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH V2 3/7] i2c: sprd: Use global variables to record I2C ack/nack status instead of local variables Content-Language: en-US To: Huangzheng Lai , Andi Shyti Cc: Orson Zhai , Baolin Wang , Chunyan Zhang , linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, huangzheng lai , Xiongpeng Wu References: <20231023081158.10654-1-Huangzheng.Lai@unisoc.com> <20231023081158.10654-4-Huangzheng.Lai@unisoc.com> From: Krzysztof Kozlowski Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 23/10/2023 10:11, Huangzheng Lai wrote: > We found that when the interrupt bit of the I2C controller is cleared, > the ack/nack bit is also cleared at the same time. After clearing the > interrupt bit in sprd_i2c_isr(), incorrect ack/nack information will be > obtained in sprd_i2c_isr_thread(), resulting in incorrect communication > when nack cannot be recognized. To solve this problem, we used a global > variable to record ack/nack information before clearing the interrupt > bit instead of a local variable. > > Fixes: 8b9ec0719834 ("i2c: Add Spreadtrum I2C controller driver") > Cc: # v4.14+ > Signed-off-by: Huangzheng Lai Fixes must be send independent of features. Best regards, Krzysztof