From patchwork Fri Feb 2 20:48:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joe Komlodi X-Patchwork-Id: 13543370 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 808C7C4828E for ; Fri, 2 Feb 2024 20:49:15 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rW0T2-0000xV-9I; Fri, 02 Feb 2024 15:48:56 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <3M1W9ZQcKCggswutwlqowwotm.kwuymu2-lm3mtvwvov2.wzo@flex--komlodi.bounces.google.com>) id 1rW0T0-0000vH-LC for qemu-devel@nongnu.org; Fri, 02 Feb 2024 15:48:54 -0500 Received: from mail-pj1-x104a.google.com ([2607:f8b0:4864:20::104a]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from <3M1W9ZQcKCggswutwlqowwotm.kwuymu2-lm3mtvwvov2.wzo@flex--komlodi.bounces.google.com>) id 1rW0Sz-000082-8k for qemu-devel@nongnu.org; Fri, 02 Feb 2024 15:48:54 -0500 Received: by mail-pj1-x104a.google.com with SMTP id 98e67ed59e1d1-2963a56416dso879436a91.3 for ; Fri, 02 Feb 2024 12:48:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1706906931; x=1707511731; darn=nongnu.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=8WeuC7JvPagfraa2WTEH94EGGshXGZXY2HdGa0YFfR8=; b=QSRl9x/UrbNLoO3ZDwQn+8PxwnMxykfB2RbfPwBZjQV6AgqeWYKCybqHzHL7GrEq4O b6lFb/7QAF62xZPdaOprbjOGqRC1KFI9T7vQDErhPazj0TeVJkZb/beImVaUhumWPbar g28JpaIXL9dBJ6ntdmvsdUYhRokuvUtacVb2LfZZnpXSNc7B6AZt62cwkYAT+9NpcXAU o7H0v3JxrilG+sQovjC5mhthV5HEXwB7/aDlPo2P+kl5/gbwQx87mk6RLhUMaywxtEKE t7JJy6W5lPy+MnFmiUWOZGxYh+b5LSCSd6lr8Y8U/Wxt1a3NyFclwLaUnxPpFHdEwECa VwKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1706906931; x=1707511731; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=8WeuC7JvPagfraa2WTEH94EGGshXGZXY2HdGa0YFfR8=; b=ASOkCQxD6qN2VTZ0K7FvyeTBktgsNUooc2gI2uDLv6aQp0z3Z9xfQoZnAU37dBfcOT xNUP13ABmeyniLgKrvtFz927A5azfaCi1kAqdZYl07QybBZTZhemBlY7hHNi0tN+li4i hWgiKLAQy4U07McdTRhTakPFHa1FDzbDpxo4BCYoPPrUots1KKQbBnLa3W+EHzCbWOf8 5YnlVNth53KnEwTA/L9wiUk88RfBDwWl/ub5cJzkOpQIcgZavwMkEGiXUdhHH7ZUm4jp aJ4vrV8QilHT/YYBMLjLV5/P8LvsBrKyTF1nyCbnZ/ovauLEdYtBlKACn43vL1maFxvZ ZsiA== X-Gm-Message-State: AOJu0Yx6HX2KfeMHUj9ay4lmg8rr3Oh0ltaNmi2octV1ZZ+cNbXuocuo 4ggurOV7QIWN1VEBXd+DPJ3e4zxDTOPUiGhdGHzlGTT6BUt1kCdSFxsQiYR9pI8Etve/eFS1Jqa XUVSraL9D8rfmte1NZJ0FyA0sKPqKHgz8uEMx+4uaJplt5K+YWx8k+rt8VMxPyACsfIBSMnHtpP 5Vnjg2u5kUJCkFyT6XNoJvq1z5Npifib7p6PUD X-Google-Smtp-Source: AGHT+IHoGumHwsKdV+lrp3vsfV2sl9AUx2eObHzrlz/abfSdNG6E1LA1YfQ+64UGCGepIFTMHOSLeh+EN+9U X-Received: from komlodi.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:35ee]) (user=komlodi job=sendgmr) by 2002:a17:90b:2e8b:b0:296:3718:2dcd with SMTP id sn11-20020a17090b2e8b00b0029637182dcdmr21731pjb.0.1706906931234; Fri, 02 Feb 2024 12:48:51 -0800 (PST) Date: Fri, 2 Feb 2024 20:48:45 +0000 In-Reply-To: <20240202204847.2062798-1-komlodi@google.com> Mime-Version: 1.0 References: <20240202204847.2062798-1-komlodi@google.com> X-Mailer: git-send-email 2.43.0.594.gd9cf4e227d-goog Message-ID: <20240202204847.2062798-2-komlodi@google.com> Subject: [PATCH v3 1/3] hw/i2c: core: Add reset From: Joe Komlodi To: qemu-devel@nongnu.org Cc: venture@google.com, komlodi@google.com, minyard@acm.org, peter.maydell@linaro.org Received-SPF: pass client-ip=2607:f8b0:4864:20::104a; envelope-from=3M1W9ZQcKCggswutwlqowwotm.kwuymu2-lm3mtvwvov2.wzo@flex--komlodi.bounces.google.com; helo=mail-pj1-x104a.google.com X-Spam_score_int: -95 X-Spam_score: -9.6 X-Spam_bar: --------- X-Spam_report: (-9.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01, USER_IN_DEF_DKIM_WL=-7.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org It's possible for a reset to come in the middle of a transaction, which causes the bus to be in an old state when a new transaction comes in. Signed-off-by: Joe Komlodi --- hw/i2c/core.c | 19 +++++++++++++++++++ include/hw/i2c/i2c.h | 2 +- 2 files changed, 20 insertions(+), 1 deletion(-) diff --git a/hw/i2c/core.c b/hw/i2c/core.c index 4cf30b2c86..3128067bba 100644 --- a/hw/i2c/core.c +++ b/hw/i2c/core.c @@ -23,10 +23,29 @@ static Property i2c_props[] = { DEFINE_PROP_END_OF_LIST(), }; +static void i2c_bus_hold_reset(Object *obj) +{ + I2CBus *bus = I2C_BUS(obj); + I2CNode *node, *next; + + bus->broadcast = false; + QLIST_FOREACH_SAFE(node, &bus->current_devs, next, next) { + QLIST_REMOVE(node, next); + g_free(node); + } +} + +static void i2c_bus_class_init(ObjectClass *klass, void *data) +{ + ResettableClass *rc = RESETTABLE_CLASS(klass); + rc->phases.hold = i2c_bus_hold_reset; +} + static const TypeInfo i2c_bus_info = { .name = TYPE_I2C_BUS, .parent = TYPE_BUS, .instance_size = sizeof(I2CBus), + .class_init = i2c_bus_class_init, }; static int i2c_bus_pre_save(void *opaque) diff --git a/include/hw/i2c/i2c.h b/include/hw/i2c/i2c.h index 2a3abacd1b..49580e30e2 100644 --- a/include/hw/i2c/i2c.h +++ b/include/hw/i2c/i2c.h @@ -64,7 +64,7 @@ struct I2CSlave { }; #define TYPE_I2C_BUS "i2c-bus" -OBJECT_DECLARE_SIMPLE_TYPE(I2CBus, I2C_BUS) +OBJECT_DECLARE_TYPE(I2CBus, I2CBusClass, I2C_BUS) typedef struct I2CNode I2CNode;