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Mon, 28 Sep 2026 10:43:01 +0000 Message-ID: <22623823-a2c7-4627-b123-12d1baed0e93@intel.com> Date: Mon, 28 Sep 2026 13:42:56 +0300 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 3/5] i3c: use actual_len for read transfers To: Frank Li , Sam Agazaryan CC: , Alexandre Belloni , Frank Li , "Greg Kroah-Hartman" , Wolfram Sang , Arnd Bergmann , "Meagan Lloyd" , Vitor Soares , Oleksandr Shulzhenko , Boris Brezillon , References: <20260921230603.2518652-1-samagazaryan@google.com> <20260921230603.2518652-4-samagazaryan@google.com> Content-Language: en-US From: Adrian Hunter Organization: Intel Finland Oy, Registered Address: c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo, Business Identity Code: 0357606 - 4, Domiciled in Helsinki In-Reply-To: X-ClientProxiedBy: DU6P191CA0021.EURP191.PROD.OUTLOOK.COM (2603:10a6:10:540::26) To IA1PR11MB7198.namprd11.prod.outlook.com (2603:10b6:208:419::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA1PR11MB7198:EE_|LV8PR11MB8608:EE_ X-MS-Office365-Filtering-Correlation-Id: 2dd36372-ae4b-420e-67ca-08df1d4d44e9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|366016|7416014|376014|1800799024|10067099003|11063799006|56012099006|22082099003|18002099003|4143699003; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org On 25/09/2026 18:25, Frank Li wrote: > On Mon, Sep 21, 2026 at 11:06:01PM +0000, Sam Agazaryan wrote: >> Currently only the amd and svc I3C controller drivers populate >> i3c_xfer.actual_len on reads, while dw-i3c-master and mipi-i3c-hci >> overwrite i3c_xfer.len with the received byte count and leave actual_len >> as 0. Because of this inconsistency, mctp-i3c reads xfer.len instead of >> xfer.actual_len, making it fail on controllers that do not mutate len. >> >> Unify read length reporting across the subsystem: >> - Clarify in that actual_len reflects the actual >> number of bytes transferred on reads. >> - Update adi, cdns, dw, mipi-i3c-hci, and renesas controller drivers to >> populate actual_len on read transfers without mutating len. >> - Update mctp-i3c to read xfer.actual_len instead of xfer.len. >> >> Co-developed-by: Meagan Lloyd >> Signed-off-by: Meagan Lloyd >> Signed-off-by: Sam Agazaryan >> --- >> drivers/i3c/master/adi-i3c-master.c | 5 ++++- >> drivers/i3c/master/dw-i3c-master.c | 2 +- >> drivers/i3c/master/i3c-master-cdns.c | 5 ++++- >> drivers/i3c/master/mipi-i3c-hci/core.c | 2 +- >> drivers/i3c/master/renesas-i3c.c | 3 +++ >> drivers/net/mctp/mctp-i3c.c | 10 +++++----- > > There are not dependence, suppose mctp-i3c.c change go through other tree > It'd better use sperate patch to fix it. Isn't mctp-i3c.c dependent on the len -> actual_len change in any of the master drivers? -- linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c