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Mon, 9 Aug 2021 06:36:19 +0000 From: Clark Wang To: miquel.raynal@bootlin.com, conor.culhane@silvaco.com, alexandre.belloni@bootlin.com Cc: linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org, linux-imx@nxp.com Subject: [PATCH V4 5/8] i3c: master: svc: set ODSTOP to let I2C device see the STOP signal Date: Mon, 9 Aug 2021 14:36:42 +0800 Message-Id: <20210809063645.2289988-6-xiaoning.wang@nxp.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210809063645.2289988-1-xiaoning.wang@nxp.com> References: <20210809063645.2289988-1-xiaoning.wang@nxp.com> X-ClientProxiedBy: SG2PR02CA0103.apcprd02.prod.outlook.com (2603:1096:4:92::19) 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 SG2PR02CA0103.apcprd02.prod.outlook.com (2603:1096:4:92::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4394.16 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 Reviewed-by: Miquel Raynal Reviewed-by: Jun Li --- V2/V3/V4: No change. --- 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 e767f307db2d..2a96b217cc78 100644 --- a/drivers/i3c/master/svc-i3c-master.c +++ b/drivers/i3c/master/svc-i3c-master.c @@ -477,7 +477,7 @@ 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 */ @@ -507,6 +507,7 @@ 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: @@ -515,6 +516,7 @@ 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: /* @@ -522,6 +524,7 @@ 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; @@ -530,7 +533,7 @@ 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