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Fri, 02 Feb 2024 12:48:54 -0800 (PST) Date: Fri, 2 Feb 2024 20:48:47 +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: <20240202204847.2062798-4-komlodi@google.com> Subject: [PATCH v3 3/3] hw/i2c: smbus_slave: Reset state on 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 (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::b4a; envelope-from=3NlW9ZQcKCgsvzxwzotrzzrwp.nzx1px5-op6pwyzyry5.z2r@flex--komlodi.bounces.google.com; helo=mail-yb1-xb4a.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: 1706906969787100003 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" If a reset comes while the SMBus device is not in its idle state, it's possible for it to get confused on valid transactions post-reset. Signed-off-by: Joe Komlodi Reviewed-by: Peter Maydell --- hw/i2c/smbus_slave.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/hw/i2c/smbus_slave.c b/hw/i2c/smbus_slave.c index 9f9afc25a4..4615e8b097 100644 --- a/hw/i2c/smbus_slave.c +++ b/hw/i2c/smbus_slave.c @@ -201,10 +201,19 @@ static int smbus_i2c_send(I2CSlave *s, uint8_t data) return 0; } =20 +static void smbus_device_hold_reset(Object *obj) +{ + SMBusDevice *dev =3D SMBUS_DEVICE(obj); + dev->mode =3D SMBUS_IDLE; + dev->data_len =3D 0; +} + static void smbus_device_class_init(ObjectClass *klass, void *data) { I2CSlaveClass *sc =3D I2C_SLAVE_CLASS(klass); + ResettableClass *rc =3D RESETTABLE_CLASS(klass); =20 + rc->phases.hold =3D smbus_device_hold_reset; sc->event =3D smbus_i2c_event; sc->recv =3D smbus_i2c_recv; sc->send =3D smbus_i2c_send; --=20 2.43.0.594.gd9cf4e227d-goog