firmware: arm_scmi: Expand SMC/HVC message pool to more than one

SMC/HVC can transmit only one message at the time as the shared memory
needs to be protected and the calls are synchronous.

However, in order to allow multiple threads to send SCMI messages
simultaneously, we need a larger poll of memory.

Let us just use value of 20 to keep it in sync mailbox transport
implementation. Any other value must work perfectly.

Link: https://lore.kernel.org/r/[email protected]
Fixes: 1dc6558062da ("firmware: arm_scmi: Add smc/hvc transport")
Cc: Peng Fan <[email protected]>
Signed-off-by: Etienne Carriere <[email protected]>
[sudeep.holla: reworded the commit message to indicate the practicality]
Signed-off-by: Sudeep Holla <[email protected]>

diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c
index 1a03c3ec02300226384d32ad2d1219e9dade9edf..82a82a5dc86ae0e7554256a33d1e9d1e10909901 100644 (file)
--- a/drivers/firmware/arm_scmi/smc.c
+++ b/drivers/firmware/arm_scmi/smc.c
@@ -149,6 +149,6 @@ static const struct scmi_transport_ops scmi_smc_ops = {
 const struct scmi_desc scmi_smc_desc = {
        .ops = &scmi_smc_ops,
        .max_rx_timeout_ms = 30,
-       .max_msg = 1,
+       .max_msg = 20,
        .max_msg_size = 128,
 };