| From 5065d170e4a0db29721991158fb171dd30163451 Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Thu, 8 Oct 2020 16:37:21 +0200 |
| Subject: firmware: arm_scmi: Expand SMC/HVC message pool to more than one |
| |
| From: Etienne Carriere <etienne.carriere@linaro.org> |
| |
| [ Upstream commit 7adb2c8aaaa6a387af7140e57004beba2c04a4c6 ] |
| |
| 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/20201008143722.21888-4-etienne.carriere@linaro.org |
| Fixes: 1dc6558062da ("firmware: arm_scmi: Add smc/hvc transport") |
| Cc: Peng Fan <peng.fan@nxp.com> |
| Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org> |
| [sudeep.holla: reworded the commit message to indicate the practicality] |
| Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> |
| Signed-off-by: Sasha Levin <sashal@kernel.org> |
| --- |
| 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 a1537d123e385..22f83af6853a1 100644 |
| --- a/drivers/firmware/arm_scmi/smc.c |
| +++ b/drivers/firmware/arm_scmi/smc.c |
| @@ -149,6 +149,6 @@ static 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, |
| }; |
| -- |
| 2.27.0 |
| |