From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([209.51.188.92]:46638) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gzQFe-0000VO-BN for qemu-devel@nongnu.org; Thu, 28 Feb 2019 13:18:00 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gzQFV-0002Ha-G9 for qemu-devel@nongnu.org; Thu, 28 Feb 2019 13:17:44 -0500 Received: from mail-ot1-x343.google.com ([2607:f8b0:4864:20::343]:35201) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1gzQFV-0002DZ-5v for qemu-devel@nongnu.org; Thu, 28 Feb 2019 13:17:37 -0500 Received: by mail-ot1-x343.google.com with SMTP id z19so18560642otm.2 for ; Thu, 28 Feb 2019 10:17:29 -0800 (PST) Sender: Corey Minyard From: minyard@acm.org Date: Thu, 28 Feb 2019 12:17:09 -0600 Message-Id: <20190228181710.2477-19-minyard@acm.org> In-Reply-To: <20190228181710.2477-1-minyard@acm.org> References: <20190228181710.2477-1-minyard@acm.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [PULL 18/19] i2c:smbus_eeprom: Add a reset function to smbus_eeprom List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Peter Maydell Cc: QEMU Developers , minyard@acm.org, Corey Minyard From: Corey Minyard Reset the contents to init data and reset the offset on a machine reset. Signed-off-by: Corey Minyard Reviewed-by: Philippe Mathieu-Daudé --- hw/i2c/smbus_eeprom.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/hw/i2c/smbus_eeprom.c b/hw/i2c/smbus_eeprom.c index 5b10c31ae7..0ba5763fc2 100644 --- a/hw/i2c/smbus_eeprom.c +++ b/hw/i2c/smbus_eeprom.c @@ -108,7 +108,17 @@ static const VMStateDescription vmstate_smbus_eeprom = { } }; -static void smbus_eeprom_realize(DeviceState *dev, Error **errp) +/* + * Reset the EEPROM contents to the initial state on a reset. This + * isn't really how an EEPROM works, of course, but the general + * principle of QEMU is to restore function on reset to what it would + * be if QEMU was stopped and started. + * + * The proper thing to do would be to have a backing blockdev to hold + * the contents and restore that on startup, and not do this on reset. + * But until that time, act as if we had been stopped and restarted. + */ +static void smbus_eeprom_reset(DeviceState *dev) { SMBusEEPROMDevice *eeprom = SMBUS_EEPROM(dev); @@ -116,6 +126,11 @@ static void smbus_eeprom_realize(DeviceState *dev, Error **errp) eeprom->offset = 0; } +static void smbus_eeprom_realize(DeviceState *dev, Error **errp) +{ + smbus_eeprom_reset(dev); +} + static Property smbus_eeprom_properties[] = { DEFINE_PROP_PTR("data", SMBusEEPROMDevice, init_data), DEFINE_PROP_END_OF_LIST(), @@ -127,6 +142,7 @@ static void smbus_eeprom_class_initfn(ObjectClass *klass, void *data) SMBusDeviceClass *sc = SMBUS_DEVICE_CLASS(klass); dc->realize = smbus_eeprom_realize; + dc->reset = smbus_eeprom_reset; sc->receive_byte = eeprom_receive_byte; sc->write_data = eeprom_write_data; dc->props = smbus_eeprom_properties; -- 2.17.1