From patchwork Fri Jun 2 11:52:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Schiffer X-Patchwork-Id: 688671 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 E1E18C7EE29 for ; Fri, 2 Jun 2023 11:54:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235014AbjFBLyi (ORCPT ); Fri, 2 Jun 2023 07:54:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234587AbjFBLyh (ORCPT ); Fri, 2 Jun 2023 07:54:37 -0400 Received: from mx1.tq-group.com (mx1.tq-group.com [93.104.207.81]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D53E41BB; Fri, 2 Jun 2023 04:54:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tq-group.com; i=@tq-group.com; q=dns/txt; s=key1; t=1685706843; x=1717242843; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=LABoMO8CCV2HXsLiDgIjvxsb0uweZP5XENgJqsudm+M=; b=CwLTX5Bof1On4jMTpMzQCh0KwHFrTHV0KI3gJXCwKSCjKyLMoD6XZRJH ocWJqbeWSWAR2E5QJg7HWK4jNqzghCAPevqUd1j78tPLI2FiGY8JWvfa+ ALaS4uT2+2ROK/Ji7u1RIkfzZzSxAwRBQFrdqA9SacTeQi39NP4bl+ZW7 Sul80Oj5TnG+gXSkcI+Dpb90V2inwQlgTmu2jd8nmha6Y5ew9H2IcqsLN 01+ejvfz2+mC9yTJ52efJjGgiqKA63hdkLrKo4WPG+rS+EMTUB1eCrfVp prd8u1PGVAhnN7ER6A3IbvnVzYfCTb351lGgYvLA0u9RP0crf/Hl5uQHJ A==; X-IronPort-AV: E=Sophos;i="6.00,212,1681164000"; d="scan'208";a="31246992" Received: from unknown (HELO tq-pgp-pr1.tq-net.de) ([192.168.6.15]) by mx1-pgp.tq-group.com with ESMTP; 02 Jun 2023 13:52:40 +0200 Received: from mx1.tq-group.com ([192.168.6.7]) by tq-pgp-pr1.tq-net.de (PGP Universal service); Fri, 02 Jun 2023 13:52:40 +0200 X-PGP-Universal: processed; by tq-pgp-pr1.tq-net.de on Fri, 02 Jun 2023 13:52:40 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tq-group.com; i=@tq-group.com; q=dns/txt; s=key1; t=1685706760; x=1717242760; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=LABoMO8CCV2HXsLiDgIjvxsb0uweZP5XENgJqsudm+M=; b=aTqFSHMRk3De/cHHxAvUPin7+/VybecWvYZ4dpNbElfpKMxbfpFWLyT6 130G6ZGi+hgqKgacfp8pka2AL8UsqyJJiJgEJSfjh+5kNdgirut8/rohF v9iS43h1/Lo3XZNgw1hOFTZiy1+JJKYWVKkRn74f+mJABPm+ujG84sxHE yoDVAy2M1GrSPP1uKydl1O39GqVKb0k4Xtpf/aaAIIjS7w7XfxgcdzMLx qoHipIotnKeCYqNL1qjxp1420RrQpKXJKGu+p5S/eG3W7zNBvE62P0ko1 mDcLBzMum9nwBgKUmXzqtUW0eLIJEK9zHFrLelmwa/fnaYY3Bcg2W+Y1X A==; X-IronPort-AV: E=Sophos;i="6.00,212,1681164000"; d="scan'208";a="31246991" Received: from vtuxmail01.tq-net.de ([10.115.0.20]) by mx1.tq-group.com with ESMTP; 02 Jun 2023 13:52:40 +0200 Received: from localhost.localdomain (unknown [192.168.66.223]) by vtuxmail01.tq-net.de (Postfix) with ESMTPA id DA2F4280087; Fri, 2 Jun 2023 13:52:39 +0200 (CEST) X-CheckPoint: {6479D7FA-2C-AA2CB662-E129E996} X-MAIL-CPID: AA5DA1E75EDCD4A6141B319D63173EDC_3 X-Control-Analysis: str=0001.0A782F1E.6479D808.0020, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 From: Matthias Schiffer To: Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Linus Walleij Cc: linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux@ew.tq-group.com, Matthias Schiffer Subject: [PATCH 1/2] spi: dt-bindings: introduce linux,use-rt-queue flag Date: Fri, 2 Jun 2023 13:52:00 +0200 Message-Id: <20230602115201.415718-1-matthias.schiffer@ew.tq-group.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org We have seen a number of downstream patches that allow enabling the realtime feature of the SPI subsystem to reduce latency. These were usually implemented for a specific SPI driver, even though the actual handling of the rt flag is happening in the generic SPI controller code. Introduce a generic linux,use-rt-queue flag that can be used with any controller driver. The now redundant driver-specific pl022,rt flag is marked as deprecated. Signed-off-by: Matthias Schiffer --- Documentation/devicetree/bindings/spi/spi-controller.yaml | 6 ++++++ Documentation/devicetree/bindings/spi/spi-pl022.yaml | 4 +++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/spi/spi-controller.yaml b/Documentation/devicetree/bindings/spi/spi-controller.yaml index 524f6fe8c27b4..a24b4ea87443b 100644 --- a/Documentation/devicetree/bindings/spi/spi-controller.yaml +++ b/Documentation/devicetree/bindings/spi/spi-controller.yaml @@ -79,6 +79,12 @@ properties: description: The SPI controller acts as a slave, instead of a master. + linux,use-rt-queue: + $ref: /schemas/types.yaml#/definitions/flag + description: + Indicates that the controller should run the message pump with realtime + priority to minimise the transfer latency on the bus. + slave: type: object diff --git a/Documentation/devicetree/bindings/spi/spi-pl022.yaml b/Documentation/devicetree/bindings/spi/spi-pl022.yaml index 91e540a92fafe..3c43fcc007e1f 100644 --- a/Documentation/devicetree/bindings/spi/spi-pl022.yaml +++ b/Documentation/devicetree/bindings/spi/spi-pl022.yaml @@ -49,8 +49,10 @@ properties: pl022,rt: description: indicates the controller should run the message pump with realtime - priority to minimise the transfer latency on the bus (boolean) + priority to minimise the transfer latency on the bus (deprecated, use the + generic linux,use-rt-queue property) type: boolean + deprecated: true dmas: description: From patchwork Fri Jun 2 11:52:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthias Schiffer X-Patchwork-Id: 690124 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 6D0B5C7EE24 for ; Fri, 2 Jun 2023 11:55:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235177AbjFBLzI (ORCPT ); Fri, 2 Jun 2023 07:55:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43100 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235391AbjFBLzG (ORCPT ); Fri, 2 Jun 2023 07:55:06 -0400 Received: from mx1.tq-group.com (mx1.tq-group.com [93.104.207.81]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7D1BF1A8; Fri, 2 Jun 2023 04:54:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tq-group.com; i=@tq-group.com; 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c=relaxed/relaxed; d=tq-group.com; i=@tq-group.com; q=dns/txt; s=key1; t=1685706761; x=1717242761; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=0NfMqRU9yhxmvM+iGSJczBKuYku1/L+ddjdiE0oaavY=; b=RY2yUqKp7kCCBJXzxw8QUxLDnUU1bcO6HELiHEcoOMFLf0/t6jeLJ1Zd o4G+30SJgbUQc4hPI0D2izEMvl92qbeEDhtKgEtMIufZnE5QNXPHxwTXA GSCxx+0YGXOzKNudMXcZq8X0VaEBbJ/1QhF7roMipDSaRtV6cUwSuq5gX GlhU+I4zy6In0fRKS/HhUvH3UL6wO2lnDNGQsF3nXBwn+KkJzb4BQedem qwAceopcXaVAIwd0wUTKm/aKHiFRCOKyk8eUgqQKM7wlvzqOUJDm+s4+p Uq3siTP5slXDcmDo08JqZSau3tkoxhfxUa5SBBYa9qjDi5x+tovX5nKyC A==; X-IronPort-AV: E=Sophos;i="6.00,212,1681164000"; d="scan'208";a="31246993" Received: from vtuxmail01.tq-net.de ([10.115.0.20]) by mx1.tq-group.com with ESMTP; 02 Jun 2023 13:52:41 +0200 Received: from localhost.localdomain (unknown [192.168.66.223]) by vtuxmail01.tq-net.de (Postfix) with ESMTPA id 8B52F280088; Fri, 2 Jun 2023 13:52:40 +0200 (CEST) X-CheckPoint: {6479D7FA-2C-AA2CB662-E129E996} X-MAIL-CPID: 2E05E409D839B4ED1AB3D8DA2C10A9CF_3 X-Control-Analysis: str=0001.0A782F1E.6479D809.0001, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 From: Matthias Schiffer To: Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Linus Walleij Cc: linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux@ew.tq-group.com, Matthias Schiffer Subject: [PATCH 2/2] spi: add support for generic linux,use-rt-queue flag Date: Fri, 2 Jun 2023 13:52:01 +0200 Message-Id: <20230602115201.415718-2-matthias.schiffer@ew.tq-group.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230602115201.415718-1-matthias.schiffer@ew.tq-group.com> References: <20230602115201.415718-1-matthias.schiffer@ew.tq-group.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Instead of requiring per-driver support to handle the message queue with realtime priority, add handling for a linux,use-rt-queue DT flag to the generic SPI controller initialization. Signed-off-by: Matthias Schiffer --- drivers/spi/spi.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 9291b2a0e8871..f069f1aef5378 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -3185,6 +3185,11 @@ int spi_register_controller(struct spi_controller *ctlr) ctlr->mode_bits |= SPI_CS_HIGH; } + /* Run message pump with realtime priority */ + if (ctlr->dev.of_node && + of_property_read_bool(ctlr->dev.of_node, "linux,use-rt-queue")) + ctlr->rt = true; + /* * Even if it's just one always-selected device, there must * be at least one chipselect.