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 C2384C25B06 for ; Mon, 15 Aug 2022 11:18:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241949AbiHOLR7 (ORCPT ); Mon, 15 Aug 2022 07:17:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36306 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232692AbiHOLR5 (ORCPT ); Mon, 15 Aug 2022 07:17:57 -0400 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ECE9E1403F; Mon, 15 Aug 2022 04:17:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1660562276; x=1692098276; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=9SeGoF8CrAaSsSonasAaaRr+fhPrMZO38waNoGudT4E=; b=d8IMqQLd4qDWdSqXMF5mVJqPIBjbmWlI15GazPM4ke4alQltL/Wt8CDS 2fiGOeNxrP20YFJI3O9WEKzYQnTmuZEsR0dHVle0GJ70kHzLWcwOhvHVe 66lT9ML31FFYL0tK0MEtJY8YCLF7fxjmdW4IFNQGcmfWURpQ+GWv+M2cx B3LXZh3A00/HIodw8xNHEyH4HjpFSTmompOCjvIi1+3TpjaLLX4PbJ8f1 B2fqxbYhn7g9z++qdTAW11muFdI/xfdmZAmY3CEkFvBOtxJRBiwFlgAvR M1GYfRu74fDZD2F0YA8fQKcxyvo0xK7c9PWAHZBbQODod2/Kxbn17Wlvn w==; X-IronPort-AV: E=McAfee;i="6400,9594,10439"; a="291936040" X-IronPort-AV: E=Sophos;i="5.93,238,1654585200"; d="scan'208";a="291936040" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Aug 2022 04:17:56 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.93,238,1654585200"; d="scan'208";a="582845183" Received: from mylly.fi.intel.com (HELO [10.237.72.177]) ([10.237.72.177]) by orsmga006.jf.intel.com with ESMTP; 15 Aug 2022 04:17:53 -0700 Message-ID: Date: Mon, 15 Aug 2022 14:17:53 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0 Thunderbird/102.1.1 Subject: Re: [PATCH v2] i2c: designware: Introduce semaphore reservation timer to AMDPSP driver To: Jan Dabros , linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org, andriy.shevchenko@linux.intel.com Cc: mika.westerberg@linux.intel.com, rrangel@chromium.org, mw@semihalf.com, upstream@semihalf.com References: <20220812071526.414285-1-jsd@semihalf.com> Content-Language: en-US From: Jarkko Nikula In-Reply-To: <20220812071526.414285-1-jsd@semihalf.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 8/12/22 10:15, Jan Dabros wrote: > In order to optimize performance, limit amount of back and forth > transactions between x86 and PSP. This is done by introduction of > semaphore reservation period - that is window in which x86 isn't > releasing the bus immediately after each I2C transaction. > > In order to protect PSP from being starved while waiting for > arbitration, after a programmed time bus is automatically released by a > deferred function. > > Signed-off-by: Jan Dabros > --- > drivers/i2c/busses/i2c-designware-amdpsp.c | 68 +++++++++++++++++----- > 1 file changed, 53 insertions(+), 15 deletions(-) > Acked-by: Jarkko Nikula