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Tue, 01 Oct 2019 09:10:34 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-ap.st.com (STMicroelectronics) with ESMTP id 4334F4C; Tue, 1 Oct 2019 07:10:15 +0000 (GMT) Received: from Webmail-eu.st.com (sfhdag5node2.st.com [10.75.127.14]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 596492AB7C3; Tue, 1 Oct 2019 09:10:15 +0200 (CEST) Received: from [10.48.1.171] (10.75.127.44) by SFHDAG5NODE2.st.com (10.75.127.14) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 1 Oct 2019 09:10:14 +0200 Subject: Re: [PATCH] i2c: i2c-stm32f7: fix first byte to send in slave mode To: Fabrice Gasnier , References: <1569857281-19419-1-git-send-email-fabrice.gasnier@st.com> From: Pierre Yves MORDRET Message-ID: <144ffb23-a56e-c60f-8c50-802921755835@st.com> Date: Tue, 1 Oct 2019 09:10:14 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <1569857281-19419-1-git-send-email-fabrice.gasnier@st.com> Content-Language: en-US X-Originating-IP: [10.75.127.44] X-ClientProxiedBy: SFHDAG8NODE2.st.com (10.75.127.23) To SFHDAG5NODE2.st.com (10.75.127.14) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,1.0.8 definitions=2019-10-01_03:2019-09-30,2019-10-01 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191001_001039_647234_312BB0BA X-CRM114-Status: GOOD ( 17.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: alexandre.torgue@st.com, linux-kernel@vger.kernel.org, alain.volmat@st.com, linux-i2c@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, Reviewed-by: Pierre-Yves MORDRET Thx On 9/30/19 5:28 PM, Fabrice Gasnier wrote: > The slave-interface documentation [1] states "the bus driver should > transmit the first byte" upon I2C_SLAVE_READ_REQUESTED slave event: > - 'val': backend returns first byte to be sent > The driver currently ignores the 1st byte to send on this event. > > Fixes: 60d609f30de2 ("i2c: i2c-stm32f7: Add slave support") > > [1] https://www.kernel.org/doc/Documentation/i2c/slave-interface > > Signed-off-by: Fabrice Gasnier > --- > drivers/i2c/busses/i2c-stm32f7.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c > index 266d1c2..0af9219 100644 > --- a/drivers/i2c/busses/i2c-stm32f7.c > +++ b/drivers/i2c/busses/i2c-stm32f7.c > @@ -1192,6 +1192,8 @@ static void stm32f7_i2c_slave_start(struct stm32f7_i2c_dev *i2c_dev) > STM32F7_I2C_CR1_TXIE; > stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, mask); > > + /* Write 1st data byte */ > + writel_relaxed(value, base + STM32F7_I2C_TXDR); > } else { > /* Notify i2c slave that new write transfer is starting */ > i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value); > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel