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i3c: master: support to adjust first broadcast address speed

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According to I3C spec 6.2 Timing Specification, the Open Drain High Period
of SCL Clock timing for first broadcast address should be adjusted to 200ns
at least. I3C device working as i2c device will see the broadcast to close
its Spike Filter then change to work at I3C mode. After that I3C open drain
SCL high level should be adjusted back.

Signed-off-by: Carlos Song <carlos.song@nxp.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240910051626.4052552-1-carlos.song@nxp.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Carlos Song
2024-09-10 13:16:25 +08:00
committed by Alexandre Belloni
parent 061dd21ca7
commit aef79e189b
2 changed files with 28 additions and 0 deletions
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12
drivers/i3c/master.c
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@@ -1868,6 +1868,12 @@ static int i3c_master_bus_init(struct i3c_master_controller *master)
goto err_bus_cleanup;
}
if (master->ops->set_speed) {
ret = master->ops->set_speed(master, I3C_OPEN_DRAIN_SLOW_SPEED);
if (ret)
goto err_bus_cleanup;
}
/*
* Reset all dynamic address that may have been assigned before
* (assigned by the bootloader for example).
@@ -1876,6 +1882,12 @@ static int i3c_master_bus_init(struct i3c_master_controller *master)
if (ret && ret != I3C_ERROR_M2)
goto err_bus_cleanup;
if (master->ops->set_speed) {
master->ops->set_speed(master, I3C_OPEN_DRAIN_NORMAL_SPEED);
if (ret)
goto err_bus_cleanup;
}
/* Disable all slave events before starting DAA. */
ret = i3c_master_disec_locked(master, I3C_BROADCAST_ADDR,
I3C_CCC_EVENT_SIR | I3C_CCC_EVENT_MR |