From nobody Thu May 7 20:07:31 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AA223C433FE for ; Thu, 19 May 2022 12:50:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238183AbiESMur (ORCPT ); Thu, 19 May 2022 08:50:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52366 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238164AbiESMuk (ORCPT ); Thu, 19 May 2022 08:50:40 -0400 Received: from mail-4323.proton.ch (mail-4323.proton.ch [185.70.43.23]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DD258BA57A; Thu, 19 May 2022 05:50:31 -0700 (PDT) Date: Thu, 19 May 2022 12:50:19 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=wujek.eu; s=protonmail2; t=1652964628; x=1653223828; bh=+6dbY/snU3b6uCWUgyekqmraArOZDE0O1Do6Z1g28TA=; h=Date:From:Cc:Reply-To:Subject:Message-ID:Feedback-ID:From:To:Cc: Date:Subject:Reply-To:Feedback-ID:Message-ID; b=M9q70UMjUe+S50Y/XwA+mERO7Nex8c1Hfssapd9f1q2X5Y8u1lPglwRW4oiT6eSkW XZCXD+90cYbj6MNmAV/e6yY+kIvzw+IqHoNNcBTn8tvm/Ndczy5zpr483sxcdQR2vk 0Onx+5I5Dw5zMO4jwGh9OvMeF3sZ1gfhko4sPMjczBMmT8qHjV5mYuZ5av7p/yE++C Cd8C3caxWD5msQw+QTk79j0wbYqIbky4Pet2Y/+71TXc586ADxOC5L9jGKYzUfo0Zn 3MlrvVHS6XDpzH0Lk8QUhjmPZanmRUt63X5zNFKRomF/uaNDv3J+BUvxBUzZx1tj5h +cBxBPZDJr1sw== From: Adam Wujek Cc: Adam Wujek , Michal Simek , linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Reply-To: Adam Wujek Subject: [PATCH] i2c: busses: i2c-cadence: fix message length when receive block message Message-ID: <20220519124946.387373-1-dev_public@wujek.eu> Feedback-ID: 23425257:user:proton MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Needed by hwmon/pmbus_core driver to correctly calculate PEC. The hwmon/pmbus_core driver relies on bus drivers to update the message len= gth of received block transfers. Only in this type of smbus transfer, in which = the length is not known before the transfer is started. Signed-off-by: Adam Wujek --- drivers/i2c/busses/i2c-cadence.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cade= nce.c index 20ac432a37ea..65f1979d4e6f 100644 --- a/drivers/i2c/busses/i2c-cadence.c +++ b/drivers/i2c/busses/i2c-cadence.c @@ -830,6 +830,11 @@ static int cdns_i2c_process_msg(struct cdns_i2c *id, s= truct i2c_msg *msg, return -ETIMEDOUT; } + /* Update message len, as i2c/smbus driver (function + * i2c_smbus_xfer_emulated) relies on i2c device drivers to do this */ + if ((msg->flags & I2C_M_RECV_LEN) && (msg->flags & I2C_M_RD)) + msg->len =3D msg->buf[0] + 2; /* add len byte + PEC byte */ + cdns_i2c_writereg(CDNS_I2C_IXR_ALL_INTR_MASK, CDNS_I2C_IDR_OFFSET); -- 2.17.1