From patchwork Sun Jun 21 14:43:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: BALATON Zoltan X-Patchwork-Id: 279859 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6A8AC433E0 for ; Sun, 21 Jun 2020 14:53:38 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 9AADD251C5 for ; Sun, 21 Jun 2020 14:53:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9AADD251C5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=eik.bme.hu Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:58048 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jn1Ll-0006Kr-SW for qemu-devel@archiver.kernel.org; Sun, 21 Jun 2020 10:53:37 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37992) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jn1Kv-0005IB-6j for qemu-devel@nongnu.org; Sun, 21 Jun 2020 10:52:45 -0400 Received: from zero.eik.bme.hu ([2001:738:2001:2001::2001]:52758) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jn1Kr-00022w-Q8 for qemu-devel@nongnu.org; Sun, 21 Jun 2020 10:52:44 -0400 Received: from zero.eik.bme.hu (blah.eik.bme.hu [152.66.115.182]) by localhost (Postfix) with SMTP id C759074594E; Sun, 21 Jun 2020 16:52:35 +0200 (CEST) Received: by zero.eik.bme.hu (Postfix, from userid 432) id 9E241745712; Sun, 21 Jun 2020 16:52:35 +0200 (CEST) From: BALATON Zoltan Subject: [PATCH] i2c: Match parameters of i2c_start_transfer and i2c_send_recv Date: Sun, 21 Jun 2020 16:43:38 +0200 MIME-Version: 1.0 To: qemu-devel@nongnu.org Message-Id: <20200621145235.9E241745712@zero.eik.bme.hu> Received-SPF: pass client-ip=2001:738:2001:2001::2001; envelope-from=balaton@eik.bme.hu; helo=zero.eik.bme.hu X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Corey Minyard , KONRAD Frederic , David Gibson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" These functions have a parameter that decides the direction of transfer but totally confusingly they don't match but inverted sense. To avoid frequent mistakes when using these functions change i2c_send_recv to match i2c_start_transfer. Also use bool in i2c_start_transfer instead of int to match i2c_send_recv. Signed-off-by: BALATON Zoltan --- Looks like hw/misc/auxbus.c already got this wrong and calls both i2c_start_transfer and i2c_send_recv with same is_write parameter. Although the name of the is_write variable suggest this may need to be inverted I'm not sure what that value actially means and which usage was correct so I did not touch it. Someone knowing this device might want to review and fix it. hw/display/sm501.c | 2 +- hw/i2c/core.c | 34 +++++++++++++++++----------------- hw/i2c/ppc4xx_i2c.c | 2 +- include/hw/i2c/i2c.h | 4 ++-- 4 files changed, 21 insertions(+), 21 deletions(-) diff --git a/hw/display/sm501.c b/hw/display/sm501.c index 2db347dcbc..ccd0a6e376 100644 --- a/hw/display/sm501.c +++ b/hw/display/sm501.c @@ -1034,7 +1034,7 @@ static void sm501_i2c_write(void *opaque, hwaddr addr, uint64_t value, int i; for (i = 0; i <= s->i2c_byte_count; i++) { res = i2c_send_recv(s->i2c_bus, &s->i2c_data[i], - !(s->i2c_addr & 1)); + s->i2c_addr & 1); if (res) { s->i2c_status |= SM501_I2C_STATUS_ERROR; return; diff --git a/hw/i2c/core.c b/hw/i2c/core.c index 1aac457a2a..c9d01df427 100644 --- a/hw/i2c/core.c +++ b/hw/i2c/core.c @@ -91,7 +91,7 @@ int i2c_bus_busy(I2CBus *bus) * without releasing the bus. If that fails, the bus is still * in a transaction. */ -int i2c_start_transfer(I2CBus *bus, uint8_t address, int recv) +int i2c_start_transfer(I2CBus *bus, uint8_t address, bool recv) { BusChild *kid; I2CSlaveClass *sc; @@ -175,26 +175,14 @@ void i2c_end_transfer(I2CBus *bus) bus->broadcast = false; } -int i2c_send_recv(I2CBus *bus, uint8_t *data, bool send) +int i2c_send_recv(I2CBus *bus, uint8_t *data, bool recv) { I2CSlaveClass *sc; I2CSlave *s; I2CNode *node; int ret = 0; - if (send) { - QLIST_FOREACH(node, &bus->current_devs, next) { - s = node->elt; - sc = I2C_SLAVE_GET_CLASS(s); - if (sc->send) { - trace_i2c_send(s->address, *data); - ret = ret || sc->send(s, *data); - } else { - ret = -1; - } - } - return ret ? -1 : 0; - } else { + if (recv) { ret = 0xff; if (!QLIST_EMPTY(&bus->current_devs) && !bus->broadcast) { sc = I2C_SLAVE_GET_CLASS(QLIST_FIRST(&bus->current_devs)->elt); @@ -206,19 +194,31 @@ int i2c_send_recv(I2CBus *bus, uint8_t *data, bool send) } *data = ret; return 0; + } else { + QLIST_FOREACH(node, &bus->current_devs, next) { + s = node->elt; + sc = I2C_SLAVE_GET_CLASS(s); + if (sc->send) { + trace_i2c_send(s->address, *data); + ret = ret || sc->send(s, *data); + } else { + ret = -1; + } + } + return ret ? -1 : 0; } } int i2c_send(I2CBus *bus, uint8_t data) { - return i2c_send_recv(bus, &data, true); + return i2c_send_recv(bus, &data, false); } uint8_t i2c_recv(I2CBus *bus) { uint8_t data = 0xff; - i2c_send_recv(bus, &data, false); + i2c_send_recv(bus, &data, true); return data; } diff --git a/hw/i2c/ppc4xx_i2c.c b/hw/i2c/ppc4xx_i2c.c index c0a8e04567..d3899203a4 100644 --- a/hw/i2c/ppc4xx_i2c.c +++ b/hw/i2c/ppc4xx_i2c.c @@ -239,7 +239,7 @@ static void ppc4xx_i2c_writeb(void *opaque, hwaddr addr, uint64_t value, } } if (!(i2c->sts & IIC_STS_ERR) && - i2c_send_recv(i2c->bus, &i2c->mdata[i], !recv)) { + i2c_send_recv(i2c->bus, &i2c->mdata[i], recv)) { i2c->sts |= IIC_STS_ERR; i2c->extsts |= IIC_EXTSTS_XFRA; break; diff --git a/include/hw/i2c/i2c.h b/include/hw/i2c/i2c.h index 4117211565..a09ab9230b 100644 --- a/include/hw/i2c/i2c.h +++ b/include/hw/i2c/i2c.h @@ -72,10 +72,10 @@ struct I2CBus { I2CBus *i2c_init_bus(DeviceState *parent, const char *name); void i2c_set_slave_address(I2CSlave *dev, uint8_t address); int i2c_bus_busy(I2CBus *bus); -int i2c_start_transfer(I2CBus *bus, uint8_t address, int recv); +int i2c_start_transfer(I2CBus *bus, uint8_t address, bool recv); void i2c_end_transfer(I2CBus *bus); void i2c_nack(I2CBus *bus); -int i2c_send_recv(I2CBus *bus, uint8_t *data, bool send); +int i2c_send_recv(I2CBus *bus, uint8_t *data, bool recv); int i2c_send(I2CBus *bus, uint8_t data); uint8_t i2c_recv(I2CBus *bus);