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i3c: master: svc: set ODSTOP to let I2C device see the STOP signal

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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>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211227074529.1660398-6-xiaoning.wang@nxp.com
This commit is contained in:
Clark Wang 2021-12-27 15:45:26 +08:00 committed by Alexandre Belloni
parent d5e512574d
commit 173fcb2721
1 changed files with 5 additions and 2 deletions
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7
drivers/i3c/master/svc-i3c-master.c
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@ -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) |