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From: Clark Wang <xiaoning.wang@nxp.com>
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	[thread overview]
Message-ID: <20210715082413.3042149-5-xiaoning.wang@nxp.com> (raw)
In-Reply-To: <20210715082413.3042149-1-xiaoning.wang@nxp.com>

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 <xiaoning.wang@nxp.com>
---
 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


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  parent reply	other threads:[~2021-07-15  8:23 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-15  8:24 [PATCH 0/4] i3c: master: svc: some bug fixes Clark Wang
2021-07-15  8:24 ` [PATCH 1/4] i3c: master: svc: move module reset behind clk enable Clark Wang
2021-07-15 22:51   ` Miquel Raynal
2021-07-15  8:24 ` [PATCH 2/4] i3c: master: svc: fix atomic issue Clark Wang
2021-07-15 22:52   ` Miquel Raynal
2021-07-16  1:58     ` Clark Wang
2021-07-15  8:24 ` [PATCH 3/4] i3c: master: svc: add support for slave to stop returning data Clark Wang
2021-07-15 22:55   ` Miquel Raynal
2021-07-16  1:53     ` Clark Wang
2021-07-15  8:24 ` Clark Wang [this message]
2021-07-15 22:57   ` [PATCH 4/4] i3c: master: svc: set ODSTOP to let I2C device see the STOP signal Miquel Raynal
2021-07-16  7:51 ` [PATCH 0/4] i3c: master: svc: some bug fixes Miquel Raynal
2021-07-16  8:07   ` Clark Wang

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