linux-kernel - [PATCH 4/5] firmware: arm_scmi: smc transport supports multi-message pool

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Message-Id: <20201008143722.21888-4-etienne.carriere@linaro.org>
Date:   Thu,  8 Oct 2020 16:37:21 +0200
From:   Etienne Carriere <etienne.carriere@...aro.org>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org,
        Sudeep Holla <sudeep.holla@....com>,
        Cristian Marussi <cristian.marussi@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Souvik Chakravarty <Souvik.Chakravarty@....com>,
        Etienne Carriere <etienne.carriere@...aro.org>,
        Peng Fan <peng.fan@....com>
Subject: [PATCH 4/5] firmware: arm_scmi: smc transport supports multi-message pool

There is no reason for the smc transport to restrict itself to a 1
message pool. More can be allocated, messages are copied from/to the
shared memory only on SMC exit/entry hence SCMI driver can play with
several messages.

Use value of 20 to mimic mailbox transport implementation. Any high
value could fit. This should be something configurable.

Signed-off-by: Etienne Carriere <etienne.carriere@...aro.org>
Cc: Peng Fan <peng.fan@....com>
---
 drivers/firmware/arm_scmi/smc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c
index 1a03c3ec0230..82a82a5dc86a 100644
--- 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,
 };
-- 
2.17.1