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Sun, 8 Apr 2018 20:36:53 -0400 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Matt Weber , John Linn , Paresh Chaudhary , Wolfram Sang , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 068/162] i2c: cadance: fix ctrl/addr reg write order Thread-Topic: [PATCH AUTOSEL for 4.4 068/162] i2c: cadance: fix ctrl/addr reg write order Thread-Index: AQHTz5mwSYuGicRnZUG4+1e4xFvKzg== Date: Mon, 9 Apr 2018 00:28:32 +0000 Message-ID: <20180409002738.163941-68-alexander.levin@microsoft.com> References: <20180409002738.163941-1-alexander.levin@microsoft.com> In-Reply-To: <20180409002738.163941-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB0885;7:r+dWky4UxtCqF3+3dvymDM/bGnhy3K12978DqPibxhuu4Pf8Ob6s5iq0ef/RiFwkXP6ABSf2P5gIMxKwdjFVBi5nIg+466+TFQnr3LV78YVJfZDfyZAAOpwjzLWq3ZDXWi97GxniZFQFyprJ7jKe8HBlyUjrUYWGLXM1jcbAOWydSsjYn0Pxm2y9rFoJIAsEZyowIkW7Xk/g/OGi4WWxmNSGvjTxkQssjCvFf8ZYoXCnJj3DoBzaEUD526Ig6+aF;20:gukal4SA9eape2MLzIAJ3fW/TFPuiJmnSYXLdjYL9d+KUorUlqFEIyu+FNgln/DekxjSrytLonHuQDGVqpj5APT30PIWhWFX84thoMerPu8mxG9rdriAn4yZXBH1YWU1Rvn7ElSJtLQ1oe4bx5h7vL73iYOnNhusBltOwKawLOE= x-ms-office365-filtering-ht: Tenant X-MS-Office365-Filtering-Correlation-Id: 54a5fe0a-e011-430b-1c94-08d59db1fad2 x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0885; 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x-microsoft-antispam-message-info: MauV1FEci1Dr4P1oQ2UhU9NTrEzp5Bk0p/45Vucx4PRB9Ueg5NHOhK6o+fM4MNAV9UuPOJ1xZbCvZxEyy2l1RkiJOGXa74mfqKOHgdK6KGzB5f1FQUuhZdxTylJ3OnxcbjX52KjxeAfl3XAbmqd8uQ75xYl44DA7uDp2PP3QHIBQBVcwRpthZxC2REMwhuAeBWy4ZbJVBD+sb1zFHQUvZtM2Bd9o8oPB1/mOr8q5LfLOh1ETRGPbGKMrTk1BQDQN6/cF3GudGo2qnjCKzW+OfJAWdKu13MOGv7QbkIBBMIrIk89rbVdEtgul8G0g7kv07wI1S/yNTZamDblCFwkYJ8Kbr8VrS2HC7hTTmwqkjaGle8O0S7CFB5JXafWIhbztTueWwgUmvQyPge+qWy41ljlAnG7t4Ga6t9GDKp8P86E= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 54a5fe0a-e011-430b-1c94-08d59db1fad2 X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Apr 2018 00:28:32.3488 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0885 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Matt Weber [ Upstream commit 8064c616984eaa015f018dba595d78cd24a0cc8c ] The driver was clearing the hold bit in the control register before writing to the address register which resulted in a stop condition being generated rather than a repeated start. This issue was only observed when a system was running much slower than a normal processor would execute. The IP data sheet mentions a ordering of writing to the address register before clearing the hold. Fixes: df8eb5691c4 ("i2c: Add driver for Cadence I2C controller") Signed-off-by: John Linn Signed-off-by: Paresh Chaudhary Signed-off-by: Matthew Weber Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- drivers/i2c/busses/i2c-cadence.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cade= nce.c index 84deed6571bd..a2f51087d8ab 100644 --- a/drivers/i2c/busses/i2c-cadence.c +++ b/drivers/i2c/busses/i2c-cadence.c @@ -401,14 +401,14 @@ static void cdns_i2c_mrecv(struct cdns_i2c *id) cdns_i2c_writereg(id->recv_count, CDNS_I2C_XFER_SIZE_OFFSET); } =20 + /* Set the slave address in address register - triggers operation */ + cdns_i2c_writereg(id->p_msg->addr & CDNS_I2C_ADDR_MASK, + CDNS_I2C_ADDR_OFFSET); /* Clear the bus hold flag if bytes to receive is less than FIFO size */ if (!id->bus_hold_flag && ((id->p_msg->flags & I2C_M_RECV_LEN) !=3D I2C_M_RECV_LEN) && (id->recv_count <=3D CDNS_I2C_FIFO_DEPTH)) cdns_i2c_clear_bus_hold(id); - /* Set the slave address in address register - triggers operation */ - cdns_i2c_writereg(id->p_msg->addr & CDNS_I2C_ADDR_MASK, - CDNS_I2C_ADDR_OFFSET); cdns_i2c_writereg(CDNS_I2C_ENABLED_INTR_MASK, CDNS_I2C_IER_OFFSET); } =20 --=20 2.15.1