From patchwork Thu May 11 18:52:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Torokhov X-Patchwork-Id: 13238361 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 51314C77B7C for ; Thu, 11 May 2023 18:53:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238954AbjEKSxF (ORCPT ); Thu, 11 May 2023 14:53:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57292 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238948AbjEKSxD (ORCPT ); Thu, 11 May 2023 14:53:03 -0400 Received: from mail-pl1-x62d.google.com (mail-pl1-x62d.google.com [IPv6:2607:f8b0:4864:20::62d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 515C949FA; Thu, 11 May 2023 11:53:02 -0700 (PDT) Received: by mail-pl1-x62d.google.com with SMTP id d9443c01a7336-1ab0c697c84so69234255ad.3; Thu, 11 May 2023 11:53:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1683831181; x=1686423181; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=HKXVPvgyQquk1TSIQ/OU7pvBBko0Yowmo5LV3A9+bSA=; b=YGArolRMbIDSSJke8TGKqCTntbcRR7Lo0Aq2TLUYrFxRcW80O8kX6d+iXPcW7ZgmH3 a90HDabJvBrKVrd7xGL4AKttT9Xd1un9Wi+NvvSdxN1e3hqPVY+0zYGw06Kt5rjQYF5x TteODwJFs0qpMZ5yzX3izLpggoJ6pz5c6bjha1a3bRFlQoqEJuobpE23nr2YDjPRhXOp 2+fKwcbFsS7QQHe7j1syiVq/6VAofn8C78hpAseTjpArAruJTgUmjWETo3rvb6jDxdfA MLOrITIrnuxA5QP/UEgIdEKbgZ4J0ia91cQpfgmjZASwFMhVULSmstIXU3ZebGqZnqDE 6dYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683831181; x=1686423181; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=HKXVPvgyQquk1TSIQ/OU7pvBBko0Yowmo5LV3A9+bSA=; b=d5FXh9FzU9fjc2JxSryJO2oYP+FTlxMjLq5oix6ZaGlFZ6ZV30Okg1aegSdDRCQScH vmxQTIc7nCUYYFuswmbLrZJ/hdWx9/tlCd5w5M84zxwfVIbGUwpBSGPwYblVHt+6kex0 hoKbirkVqgNykffieH3qal7J6XEHomx7Wkck2qXfd42CLx3+gg3IdlYZESZHTf0YBfdw 62yg/LaE7yqgx9Lg5bgXXGCv0FLJ0VDiz0i7JJCPD6PMF0DqXDUKpui/6WqzrMcbcaXX p9tyzXIbPKZTItQ/hHUUcUCoAZS10ljWJCQj0XokMPr8oy4sJb3l6iQY+bcM6H7URYlW G0WA== X-Gm-Message-State: AC+VfDx8tdgxec8PknUrB3UQB8jCuS6GmMNdpSy8wbthv1DHzIH1XzoB 9besB7nOgZn8n7OajkoR0hMFpstAeZk= X-Google-Smtp-Source: ACHHUZ4iYtXDja/WYrLCsLdZdvRrKMJWXkSRRf2mDFbhxqu65bFNoZsLKcdkXTcODEYUt/FIKPHdbg== X-Received: by 2002:a17:903:185:b0:1a9:6bd4:236a with SMTP id z5-20020a170903018500b001a96bd4236amr28122650plg.69.1683831181145; Thu, 11 May 2023 11:53:01 -0700 (PDT) Received: from dtor-ws.mtv.corp.google.com ([2620:15c:9d:2:84a:ed9c:4024:c347]) by smtp.gmail.com with ESMTPSA id q5-20020a170902788500b001a980a23804sm6288995pll.4.2023.05.11.11.52.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 May 2023 11:53:00 -0700 (PDT) From: Dmitry Torokhov To: linux-input@vger.kernel.org Cc: Raul E Rangel , linux-kernel@vger.kernel.org Subject: [PATCH 3/7] Input: libps2 - rework handling of command response Date: Thu, 11 May 2023 11:52:43 -0700 Message-ID: <20230511185252.386941-4-dmitry.torokhov@gmail.com> X-Mailer: git-send-email 2.40.1.606.ga4b1b128d6-goog In-Reply-To: <20230511185252.386941-1-dmitry.torokhov@gmail.com> References: <20230511185252.386941-1-dmitry.torokhov@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org It is not entirely correct that libps2 sets PS2_FLAG_CMD1 after the device acknowledges each byte sent to the device by the host. Rework the code so that PS2_FLAG_CMD1 and PS2_FLAG_CMD are set only once, at the beginning of PS/2 command execution. Signed-off-by: Dmitry Torokhov Reviewed-by: Raul E Rangel --- drivers/input/serio/libps2.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/drivers/input/serio/libps2.c b/drivers/input/serio/libps2.c index 399cda0d34f5..d09450eca9a7 100644 --- a/drivers/input/serio/libps2.c +++ b/drivers/input/serio/libps2.c @@ -247,14 +247,19 @@ int __ps2_command(struct ps2dev *ps2dev, u8 *param, unsigned int command) serio_pause_rx(ps2dev->serio); + /* Some mice do not ACK the "get ID" command, prepare to handle this. */ ps2dev->flags = command == PS2_CMD_GETID ? PS2_FLAG_WAITID : 0; ps2dev->cmdcnt = receive; - if (receive && param) - for (i = 0; i < receive; i++) - ps2dev->cmdbuf[(receive - 1) - i] = param[i]; + if (receive) { + /* Indicate that we expect response to the command. */ + ps2dev->flags |= PS2_FLAG_CMD | PS2_FLAG_CMD1; + if (param) + for (i = 0; i < receive; i++) + ps2dev->cmdbuf[(receive - 1) - i] = param[i]; + } /* - * Some devices (Synaptics) peform the reset before + * Some devices (Synaptics) perform the reset before * ACKing the reset command, and so it can take a long * time before the ACK arrives. */ @@ -434,11 +439,8 @@ bool ps2_handle_ack(struct ps2dev *ps2dev, u8 data) return true; } - if (!ps2dev->nak) { + if (!ps2dev->nak) ps2dev->flags &= ~PS2_FLAG_NAK; - if (ps2dev->cmdcnt) - ps2dev->flags |= PS2_FLAG_CMD | PS2_FLAG_CMD1; - } ps2dev->flags &= ~PS2_FLAG_ACK; wake_up(&ps2dev->wait);