firmware: arm_scmi: Reject SCMI drivers when configured in raw mode

Reject SCMI driver registration when SCMI raw mode support is configured,
so as to avoid interferences between the SCMI raw mode transactions and the
normal SCMI stack operations.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lore.kernel.org/r/20230118121426.492864-15-cristian.marussi@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c
index 6228f1581fe362ff0005e200e2674f5325f3d10e..8601d75f5b9bfe78d3ea17e9ecb5506c8f935bd9 100644 (file)
--- a/drivers/firmware/arm_scmi/bus.c
+++ b/drivers/firmware/arm_scmi/bus.c
@@ -59,6 +59,12 @@ static int scmi_protocol_device_request(const struct scmi_device_id *id_table)
        pr_debug("Requesting SCMI device (%s) for protocol %x\n",
                 id_table->name, id_table->protocol_id);
 
+       if (IS_ENABLED(CONFIG_ARM_SCMI_RAW_MODE_SUPPORT)) {
+               pr_warn("SCMI Raw mode active. Rejecting '%s'/0x%02X\n",
+                       id_table->name, id_table->protocol_id);
+               return -EINVAL;
+       }
+
        /*
         * Search for the matching protocol rdev list and then search
         * of any existent equally named device...fails if any duplicate found.