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i3c: mipi-i3c-hci: Fix Hot-Join NACK

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The MIPI I3C HCI host controller driver does not implement Hot-Join
handling, yet Hot-Join response control defaults to allowing devices to
Hot-Join the bus.  Configure HC_CONTROL_HOT_JOIN_CTRL to NACK all Hot-Join
attempts.

Fixes: 9ad9a52cce ("i3c/master: introduce the mipi-i3c-hci driver")
Cc: stable@vger.kernel.org
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260306072451.11131-3-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Adrian Hunter
2026-03-06 09:24:39 +02:00
committed by Alexandre Belloni
parent 4167b89144
commit fa9586bd77
1 changed files with 4 additions and 2 deletions
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6
drivers/i3c/master/mipi-i3c-hci/core.c
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@@ -152,7 +152,8 @@ static int i3c_hci_bus_init(struct i3c_master_controller *m)
if (hci->quirks & HCI_QUIRK_RESP_BUF_THLD)
amd_set_resp_buf_thld(hci);
reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE);
/* Enable bus with Hot-Join disabled */
reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE | HC_CONTROL_HOT_JOIN_CTRL);
dev_dbg(&hci->master.dev, "HC_CONTROL = %#x", reg_read(HC_CONTROL));
return 0;
@@ -764,7 +765,8 @@ static int i3c_hci_runtime_resume(struct device *dev)
hci->io->resume(hci);
reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE);
/* Enable bus with Hot-Join disabled */
reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE | HC_CONTROL_HOT_JOIN_CTRL);
return 0;
}