i3c: mipi-i3c-hci: Report NACK response from CCC command to core

Currently probe of mipi-i3c-hci will fail if bus doesn't have any I3C
devices connected. This happens when CCC commands that are sent during
i3c_master_bus_init() are not ACKed by any device and controller responds
with an error status set.

The controller can detect NACK both during I3C address header
transmission (broadcast address 0x7e is not ACKed) and when target
device address or dynamic address assignment is NACKed. Former as error
status 0x4: Address Header Error and latter as 0x5: NACK.

Difference between those two NACK statuses were not described explicitly
until MIPI I3C HCI Specification v1.1. Earlier versions share the same
error status code though.

Report both of those as I3C_ERROR_M2 to I3C core code.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Link: https://lore.kernel.org/r/20231109133708.653950-2-jarkko.nikula@linux.intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/i3c/master/mipi-i3c-hci/core.c b/drivers/i3c/master/mipi-i3c-hci/core.c
index 1ae56a5699c6b63eee19e73031d28658e5e1d3ca..8471a1fe1dad98e2f84287d337dcad4c9de18eb3 100644 (file)
--- a/drivers/i3c/master/mipi-i3c-hci/core.c
+++ b/drivers/i3c/master/mipi-i3c-hci/core.c
@@ -245,7 +245,14 @@ static int i3c_hci_send_ccc_cmd(struct i3c_master_controller *m,
                if (ccc->rnw)
                        ccc->dests[i - prefixed].payload.len =
                                RESP_DATA_LENGTH(xfer[i].response);
-               if (RESP_STATUS(xfer[i].response) != RESP_SUCCESS) {
+               switch (RESP_STATUS(xfer[i].response)) {
+               case RESP_SUCCESS:
+                       continue;
+               case RESP_ERR_ADDR_HEADER:
+               case RESP_ERR_NACK:
+                       ccc->err = I3C_ERROR_M2;
+                       fallthrough;
+               default:
                        ret = -EIO;
                        goto out;
                }