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

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: 9ad9a52cce282 ("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>

authored by

Adrian Hunter and committed by
Alexandre Belloni fa9586bd 4167b891

+4 -2
+4 -2
drivers/i3c/master/mipi-i3c-hci/core.c
··· 152 152 if (hci->quirks & HCI_QUIRK_RESP_BUF_THLD) 153 153 amd_set_resp_buf_thld(hci); 154 154 155 - reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE); 155 + /* Enable bus with Hot-Join disabled */ 156 + reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE | HC_CONTROL_HOT_JOIN_CTRL); 156 157 dev_dbg(&hci->master.dev, "HC_CONTROL = %#x", reg_read(HC_CONTROL)); 157 158 158 159 return 0; ··· 765 764 766 765 hci->io->resume(hci); 767 766 768 - reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE); 767 + /* Enable bus with Hot-Join disabled */ 768 + reg_set(HC_CONTROL, HC_CONTROL_BUS_ENABLE | HC_CONTROL_HOT_JOIN_CTRL); 769 769 770 770 return 0; 771 771 }