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linux/drivers/i3c/master
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Frank Li ad661951a9 i3c: master: svc: fix probe failure when no i3c device exist 
commit 6e13d6528b upstream.

I3C masters are expected to support hot-join. This means at initialization
time we might not yet discover any device and this should not be treated
as a fatal error.

During the DAA procedure which happens at probe time, if no device has
joined, all CCC will be NACKed (from a bus perspective). This leads to an
early return with an error code which fails the probe of the master.

Let's avoid this by just telling the core through an I3C_ERROR_M2
return command code that no device was discovered, which is a valid
situation. This way the master will no longer bail out and fail to probe
for a wrong reason.

Cc: stable@vger.kernel.org
Fixes: dd3c52846d ("i3c: master: svc: Add Silvaco I3C master driver")
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20230831141324.2841525-1-Frank.Li@nxp.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2023-09-13 09:43:01 +02:00
..
mipi-i3c-hci i3c/master: simplify the return expression of i3c_hci_remove() 2022-05-17 22:33:43 +02:00
dw-i3c-master.c i3c: master: dw: check return of dw_i3c_master_get_free_pos() 2022-01-13 02:05:50 +01:00
i3c-master-cdns.c i3c: master: cdns: Fix fall-through warning for Clang 2021-06-29 08:37:04 -05:00
Kconfig i3c: master: svc: Add Silvaco I3C master driver 2021-02-06 00:43:29 +01:00
Makefile i3c: master: svc: Add Silvaco I3C master driver 2021-02-06 00:43:29 +01:00
svc-i3c-master.c i3c: master: svc: fix probe failure when no i3c device exist 2023-09-13 09:43:01 +02:00