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firmware: arm_scmi: Give SMC transport precedence over mailbox

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Broadcom STB platforms have for historical reasons included both
"arm,scmi-smc" and "arm,scmi" in their SCMI Device Tree node compatible
string, in that order.

After the commit b53515fa17 ("firmware: arm_scmi: Make MBOX transport
a standalone driver") and with a kernel configuration that enables both
the SMC and the mailbox transports, we would probe the mailbox transport,
but fail to complete since we would not have a mailbox driver available.

With each SCMI transport being a platform driver with its own set of
compatible strings to match, rather than an unique platform driver entry
point, we no longer match from most specific to least specific. There is
also no simple way for the mailbox driver to return -ENODEV and let
another platform driver attempt probing. This leads to a platform with
no SCMI provider, therefore all drivers depending upon SCMI resources
are put on deferred probe forever.

By keeping the SMC transport objects linked first, we can let the
platform driver match the compatible string and probe successfully with
no adverse effects on platforms using the mailbox transport.

This is just the workaround to the issue observed which doesn't have any
impact on the other platforms.

Fixes: b53515fa17 ("firmware: arm_scmi: Make MBOX transport a standalone driver")
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Message-Id: <20241007235413.507860-1-florian.fainelli@broadcom.com>
Reviewed-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Florian Fainelli
2024-10-07 16:54:13 -07:00
committed by Sudeep Holla
parent 39b13dce1a
commit db8f0b8088
1 changed files with 4 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/firmware/arm_scmi/transports/Makefile
View File

@@ -1,8 +1,10 @@
# SPDX-License-Identifier: GPL-2.0-only
scmi_transport_mailbox-objs := mailbox.o
obj-$(CONFIG_ARM_SCMI_TRANSPORT_MAILBOX) += scmi_transport_mailbox.o
# Keep before scmi_transport_mailbox.o to allow precedence
# while matching the compatible.
scmi_transport_smc-objs := smc.o
obj-$(CONFIG_ARM_SCMI_TRANSPORT_SMC) += scmi_transport_smc.o
scmi_transport_mailbox-objs := mailbox.o
obj-$(CONFIG_ARM_SCMI_TRANSPORT_MAILBOX) += scmi_transport_mailbox.o
scmi_transport_optee-objs := optee.o
obj-$(CONFIG_ARM_SCMI_TRANSPORT_OPTEE) += scmi_transport_optee.o
scmi_transport_virtio-objs := virtio.o