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Tue, 20 Feb 2024 13:11:27 -0800 (PST) Date: Tue, 20 Feb 2024 21:11:21 +0000 In-Reply-To: <20240220211123.2664977-1-komlodi@google.com> Mime-Version: 1.0 References: <20240220211123.2664977-1-komlodi@google.com> X-Mailer: git-send-email 2.44.0.rc0.258.g7320e95886-goog Message-ID: <20240220211123.2664977-2-komlodi@google.com> Subject: [PATCH v4 1/3] hw/i2c: core: Add reset From: Joe Komlodi To: qemu-devel@nongnu.org Cc: komlodi@google.com, venture@google.com, minyard@acm.org, peter.maydell@linaro.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::114a; envelope-from=3fxXVZQcKCjQaecbeTYWeeWbU.SecgUck-TUlUbdedWdk.ehW@flex--komlodi.bounces.google.com; helo=mail-yw1-x114a.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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1708463521403100003 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 +++++++++++++++++++ 1 file changed, 19 insertions(+) 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[] =3D { DEFINE_PROP_END_OF_LIST(), }; =20 +static void i2c_bus_hold_reset(Object *obj) +{ + I2CBus *bus =3D I2C_BUS(obj); + I2CNode *node, *next; + + bus->broadcast =3D 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 =3D RESETTABLE_CLASS(klass); + rc->phases.hold =3D i2c_bus_hold_reset; +} + static const TypeInfo i2c_bus_info =3D { .name =3D TYPE_I2C_BUS, .parent =3D TYPE_BUS, .instance_size =3D sizeof(I2CBus), + .class_init =3D i2c_bus_class_init, }; =20 static int i2c_bus_pre_save(void *opaque) --=20 2.44.0.rc0.258.g7320e95886-goog