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Received: from AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) by AS8PR04MB8851.eurprd04.prod.outlook.com (2603:10a6:20b:42e::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7068.13; Thu, 30 Nov 2023 22:44:37 +0000 Received: from AM6PR04MB4838.eurprd04.prod.outlook.com ([fe80::95f5:5118:258f:ee40]) by AM6PR04MB4838.eurprd04.prod.outlook.com ([fe80::95f5:5118:258f:ee40%6]) with mapi id 15.20.7046.015; Thu, 30 Nov 2023 22:44:37 +0000 From: Frank Li To: miquel.raynal@bootlin.com Cc: Frank.li@nxp.com, alexandre.belloni@bootlin.com, conor.culhane@silvaco.com, imx@lists.linux.dev, joe@perches.com, linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org, zbigniew.lukwinski@linux.intel.com, gregkh@linuxfoundation.org, jirislaby@kernel.org, linux-serial@vger.kernel.org Subject: [PATCH v5 3/7] i3c: add actual_len in i3c_priv_xfer Date: Thu, 30 Nov 2023 17:44:04 -0500 Message-Id: <20231130224408.3591288-4-Frank.Li@nxp.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231130224408.3591288-1-Frank.Li@nxp.com> References: <20231130224408.3591288-1-Frank.Li@nxp.com> X-ClientProxiedBy: SJ0PR03CA0212.namprd03.prod.outlook.com (2603:10b6:a03:39f::7) To AM6PR04MB4838.eurprd04.prod.outlook.com (2603:10a6:20b:4::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM6PR04MB4838:EE_|AS8PR04MB8851:EE_ X-MS-Office365-Filtering-Correlation-Id: a6686b44-0440-4b23-d94d-08dbf1f5eeb1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Thu, 30 Nov 2023 14:44:51 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1784030738016432915 X-GMAIL-MSGID: 1784030738016432915 In MIPI I3C Specification: "Ninth Bit of SDR Target Returned (Read) Data as End-of-Data: In I2C, the ninth Data bit from Target to Controller is an ACK by the Controller. By contrast, in I3C this bit allows the Target to end a Read, and allows the Controller to Abort a Read. In SDR terms, the ninth bit of Read data is referred to as the T-Bit (for ‘Transition’)" I3C allow devices early terminate data transfer. So need "actual_len" field to indicate how much get by i3c_priv_xfer. Reviewed-by: Miquel Raynal Signed-off-by: Frank Li --- Notes: change from v4 to v5 - Add Miquel review tag include/linux/i3c/device.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h index 90fa83464f003..ef6217da8253b 100644 --- a/include/linux/i3c/device.h +++ b/include/linux/i3c/device.h @@ -54,6 +54,7 @@ enum i3c_hdr_mode { * struct i3c_priv_xfer - I3C SDR private transfer * @rnw: encodes the transfer direction. true for a read, false for a write * @len: transfer length in bytes of the transfer + * @actual_len: actual length in bytes are transferred by the controller * @data: input/output buffer * @data.in: input buffer. Must point to a DMA-able buffer * @data.out: output buffer. Must point to a DMA-able buffer @@ -62,6 +63,7 @@ enum i3c_hdr_mode { struct i3c_priv_xfer { u8 rnw; u16 len; + u16 actual_len; union { void *in; const void *out;