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=-3.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 C7C6EC04AB4 for ; Tue, 14 May 2019 18:40:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9BD2820879 for ; Tue, 14 May 2019 18:40:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="H5Y9KXgw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726412AbfENSkH (ORCPT ); Tue, 14 May 2019 14:40:07 -0400 Received: from mail-pg1-f194.google.com ([209.85.215.194]:40349 "EHLO mail-pg1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726218AbfENSkH (ORCPT ); Tue, 14 May 2019 14:40:07 -0400 Received: by mail-pg1-f194.google.com with SMTP id d31so9047344pgl.7 for ; Tue, 14 May 2019 11:40:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=U5lmD3O2z0vSk4VQzRzNUrXAaT7ROOc/nk13EyEk/Z8=; b=H5Y9KXgwnq7ezY/NEDojzcCdz/MTUU2ltKGxRIk7MI7CfJPl17Hr+/0JzOFSuTp/HD jDhdlTjiAgAJeyqcChsshmGOG/i6tU6ESAAdF/KguksGOcQ3RtCOJPI7Ka+mo0jFkIES AF5gTR+hcgOEwZCn0zjbxF+tOlJQ23fa3GyBo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=U5lmD3O2z0vSk4VQzRzNUrXAaT7ROOc/nk13EyEk/Z8=; b=KIZQJ0hePxy2m0IZEp27JES9Z9GVBE9rWmWhB/CqL0cmGqWjk6HpUKDy3nrRbBQO28 8qcuvgCgADwXX4rUtgZj3dtgPM9OHUZEy32QW5CYZz4Z+JxychRTaYcr80ySknb0oUmE rOAMe0XOXjjHK/GFget84ZeD+YCCYX17e5hlBeWti5O9m1t55Kk/j8etN5vgnUsh3Q0P 8nTY3+6fy0SQOhfwysfGg7VW6pHjgrI6C0Il4AwWX4MhjSwt8oDZHSV3d+muX9MQrMPN Wa2rp7aMcsxMOKQCXtGCv2K2KpcbAkOxUDYiKvK6elevI6dQmmC24VPZc0k5xndqKPsA e8LQ== X-Gm-Message-State: APjAAAWbc/kkuADpPuW1mOAe1MfD1rBZN8qTIviAD0rumBuPFOyMXmRh /Zn84jfW/tfBzNWVM8kKODtnxw== X-Google-Smtp-Source: APXvYqzB/ncd07lY8oKwjyYs9cE0Ws3ptZ6OOxXnzgYsvm+RO6GmbunYYA6NV+JxBn4oUSn8b/7Vug== X-Received: by 2002:a63:7909:: with SMTP id u9mr33519089pgc.223.1557859206272; Tue, 14 May 2019 11:40:06 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:202:1:24fa:e766:52c9:e3b2]) by smtp.gmail.com with ESMTPSA id 19sm19182454pgz.24.2019.05.14.11.40.04 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 14 May 2019 11:40:05 -0700 (PDT) From: Douglas Anderson To: Mark Brown , Benson Leung , Enric Balletbo i Serra Cc: linux-rockchip@lists.infradead.org, drinkcat@chromium.org, Guenter Roeck , briannorris@chromium.org, mka@chromium.org, Douglas Anderson , linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org Subject: [PATCH v3 0/3] spi: A better solution for cros_ec_spi reliability Date: Tue, 14 May 2019 11:39:32 -0700 Message-Id: <20190514183935.143463-1-dianders@chromium.org> X-Mailer: git-send-email 2.21.0.1020.gf2820cf01a-goog MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This series is a much better solution for getting the Chrome OS EC to talk reliably. Patch #1 in this series is the most important. It can land any time. Patch #2 in this series (a SPI framework patch) needs to land before patch #3. Note that patches #2 and #3 really just fix a corner case and just having patch #1 is the most important. We don't end up on the pumping thread very often. Note: - If you want some history on investigation done here, feel free to peruse the Chrome OS bug: . Changes in v3: - cros_ec realtime patch replaces revert; now patch #1 - SPI core change now like patch v1 patch #2 (with name "rt"). - Updated description and variable name since we no longer force. Changes in v2: - Now only force transfers to the thread for devices that want it. - Squashed patch #1 and #2 together. - Renamed variable to "force_rt_transfers". - Renamed variable to "force_rt_transfers". Douglas Anderson (3): platform/chrome: cros_ec_spi: Move to real time priority for transfers spi: Allow SPI devices to request the pumping thread be realtime platform/chrome: cros_ec_spi: Request the SPI thread be realtime drivers/platform/chrome/cros_ec_spi.c | 89 +++++++++++++++++++++++---- drivers/spi/spi.c | 36 +++++++++-- include/linux/spi/spi.h | 2 + 3 files changed, 110 insertions(+), 17 deletions(-) -- 2.21.0.1020.gf2820cf01a-goog