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=-11.5 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 DD892C4338F for ; Wed, 25 Aug 2021 16:29:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C41C3610C7 for ; Wed, 25 Aug 2021 16:29:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240716AbhHYQa2 (ORCPT ); Wed, 25 Aug 2021 12:30:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41408 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235063AbhHYQa1 (ORCPT ); Wed, 25 Aug 2021 12:30:27 -0400 Received: from mail-pg1-x52c.google.com (mail-pg1-x52c.google.com [IPv6:2607:f8b0:4864:20::52c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B458FC061757 for ; Wed, 25 Aug 2021 09:29:41 -0700 (PDT) Received: by mail-pg1-x52c.google.com with SMTP id k14so202880pga.13 for ; Wed, 25 Aug 2021 09:29:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=message-id:date:mime-version:user-agent:subject:content-language:to :cc:references:from:in-reply-to:content-transfer-encoding; bh=F1mBNZzXkhmLcRrSxvnNc8vUPy/DeUn4C4WdzY0Xs1Y=; b=lrD2ZeGT9LxGiKtet3ojNPt0skpiGvCm59mnedkZ3Q9FQ3v7oYwr7fI3tpIDfmLPki dMj0/D303rF1hN3OYzNLBMMYB2hQE5EdU5MgHwKjWtpDGmJMt1R5tLg1G8ZuflOB6xqg FoI62aE0ezTyHuXmtJhH7kx78OJlc/RDk28jk2W4GXLxHzdyzlN4kXcL3wrFaN7Fph3z KTPX4QgYeG3Vu4L/F1cFbKPLfcuxqGec/K4UtPpL5G/JCbuJJeem/HKC90JJAAssomZU 4Cm92zrUWIko/POR3vfBXTGqcZW3o3NYn77C2F/KBhG0vjItk0b3Q6iDLlcfTGbH4Ofy 49cg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=F1mBNZzXkhmLcRrSxvnNc8vUPy/DeUn4C4WdzY0Xs1Y=; b=qYjEvsULO+aT5H88pzyoUnSQSPwUBNKKiATkV5w+jBeHRiuXgPN3M2Go56j5nMcwNP 7psrUGT+y3rFN4Q1a9Zigr7UqYaLb5ARMfQ/QGPbaihZyxsGhrW08H+4lt2kTa0VuhXJ sTWrHXCSrvMrMVKSkGzuu6L0hn+LBWBGjHz98hP0l3IsMgnP2uWVWXkCbZ06qWoRYfG7 RKgjCGs4njj4NRCNvQv95R3ZWUe0AYKzyu7SU70jFPd43ic0ajKMRxS3xLc91xi6a+vs keE29Sek8+V2KFrEebI1/nKh3LwLlt4YZoPpg33i+DpvWeHA52QV5J97q1KWGPNlb5hk 81cA== X-Gm-Message-State: AOAM530bceyd28gCcNp/Bk/MMmGrb9lJRxEQUwnj1GCwJ4UQYO09Jy0k 2AchUOzUF/KCpqSrFb959WY= X-Google-Smtp-Source: ABdhPJy9ioGHbzmFpcDaF/H6MSYT6Vj6bnjwyI4SI/SVkFtmfyzTV9WQ0LOSU/UHcM+RDRW46rpq6Q== X-Received: by 2002:a65:414a:: with SMTP id x10mr30233346pgp.403.1629908981273; Wed, 25 Aug 2021 09:29:41 -0700 (PDT) Received: from [10.230.31.46] ([192.19.223.252]) by smtp.gmail.com with UTF8SMTPSA id pc11sm6088023pjb.17.2021.08.25.09.29.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 25 Aug 2021 09:29:40 -0700 (PDT) Message-ID: <3be84c2b-bb86-65c4-4c32-957767ffa577@gmail.com> Date: Wed, 25 Aug 2021 18:29:31 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.0.2 Subject: Re: [PATCH v4 02/12] firmware: arm_scmi: Add configurable polling mode for transports Content-Language: en-US To: Cristian Marussi , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: sudeep.holla@arm.com, james.quinlan@broadcom.com, Jonathan.Cameron@Huawei.com, etienne.carriere@linaro.org, vincent.guittot@linaro.org, souvik.chakravarty@arm.com References: <20210824135941.38656-1-cristian.marussi@arm.com> <20210824135941.38656-3-cristian.marussi@arm.com> From: Florian Fainelli In-Reply-To: <20210824135941.38656-3-cristian.marussi@arm.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 8/24/2021 3:59 PM, Cristian Marussi wrote: > SCMI communications along TX channels can optionally be provided of a > completion interrupt; when such interrupt is not available, command > transactions should rely on polling, where the SCMI core takes care to > repeatedly evaluate the transport-specific .poll_done() function to > determine if and when a request was fully completed or timed out. > > Such mechanism is already present and working on a single transfer base: > SCMI protocols can indeed enable hdr.poll_completion on specific commands > ahead of each transfer and cause that transaction to be handled with > polling. > > Introduce a couple of flags to be able to enforce such polling behaviour > globally at will: > > - scmi_desc.force_polling: to statically switch the whole transport to > polling mode. > > - scmi_chan_info.no_completion_irq: to switch a single channel dynamically > to polling mode if at runtime is determined that no completion interrupt > was available for such channel. > > Signed-off-by: Cristian Marussi Reviewed-by: Florian Fainelli -- Florian