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dmarc=none action=none header.from=nxp.com; Received: from AM6PR04MB5623.eurprd04.prod.outlook.com (2603:10a6:20b:a9::13) by AM6PR04MB4167.eurprd04.prod.outlook.com (2603:10a6:209:4e::25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4331.21; Thu, 15 Jul 2021 08:23:12 +0000 Received: from AM6PR04MB5623.eurprd04.prod.outlook.com ([fe80::74f8:10b:8efd:b265]) by AM6PR04MB5623.eurprd04.prod.outlook.com ([fe80::74f8:10b:8efd:b265%5]) with mapi id 15.20.4308.027; Thu, 15 Jul 2021 08:23:12 +0000 From: Clark Wang To: miquel.raynal@bootlin.com, conor.culhane@silvaco.com, alexandre.belloni@bootlin.com, vitor.soares@synopsys.com, boris.brezillon@bootlin.com Cc: linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org, xiaoning.wang@nxp.com Subject: [PATCH 4/4] i3c: master: svc: set ODSTOP to let I2C device see the STOP signal Date: Thu, 15 Jul 2021 16:24:13 +0800 Message-Id: <20210715082413.3042149-5-xiaoning.wang@nxp.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210715082413.3042149-1-xiaoning.wang@nxp.com> References: <20210715082413.3042149-1-xiaoning.wang@nxp.com> X-ClientProxiedBy: SG2PR03CA0142.apcprd03.prod.outlook.com (2603:1096:4:c8::15) To AM6PR04MB5623.eurprd04.prod.outlook.com (2603:10a6:20b:a9::13) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (119.31.174.71) by SG2PR03CA0142.apcprd03.prod.outlook.com (2603:1096:4:c8::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4352.9 via Frontend Transport; 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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 If using I2C/I3C mixed mode, need to set ODSTOP. Otherwise, the I2C devices cannot see the stop signal. It may cause message sending errors. Signed-off-by: Clark Wang --- drivers/i3c/master/svc-i3c-master.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c index 892e57fec4b0..b05cc7f521e6 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -449,7 +449,7 @@ static int svc_i3c_master_bus_init(struct i3c_master_controller *m) struct i3c_device_info info = {}; unsigned long fclk_rate, fclk_period_ns; unsigned int high_period_ns, od_low_period_ns; - u32 ppbaud, pplow, odhpp, odbaud, i2cbaud, reg; + u32 ppbaud, pplow, odhpp, odbaud, odstop, i2cbaud, reg; int ret; /* Timings derivation */ @@ -479,6 +479,7 @@ static int svc_i3c_master_bus_init(struct i3c_master_controller *m) switch (bus->mode) { case I3C_BUS_MODE_PURE: i2cbaud = 0; + odstop = 0; break; case I3C_BUS_MODE_MIXED_FAST: case I3C_BUS_MODE_MIXED_LIMITED: @@ -487,6 +488,7 @@ static int svc_i3c_master_bus_init(struct i3c_master_controller *m) * between the high and low period does not really matter. */ i2cbaud = DIV_ROUND_UP(1000, od_low_period_ns) - 2; + odstop = 1; break; case I3C_BUS_MODE_MIXED_SLOW: /* @@ -494,6 +496,7 @@ static int svc_i3c_master_bus_init(struct i3c_master_controller *m) * constraints as the FM+ mode. */ i2cbaud = DIV_ROUND_UP(2500, od_low_period_ns) - 2; + odstop = 1; break; default: return -EINVAL; @@ -502,7 +505,7 @@ static int svc_i3c_master_bus_init(struct i3c_master_controller *m) reg = SVC_I3C_MCONFIG_MASTER_EN | SVC_I3C_MCONFIG_DISTO(0) | SVC_I3C_MCONFIG_HKEEP(0) | - SVC_I3C_MCONFIG_ODSTOP(0) | + SVC_I3C_MCONFIG_ODSTOP(odstop) | SVC_I3C_MCONFIG_PPBAUD(ppbaud) | SVC_I3C_MCONFIG_PPLOW(pplow) | SVC_I3C_MCONFIG_ODBAUD(odbaud) | -- 2.25.1 -- linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c