linux-kernel - [PATCH 5/6] firmware: arm_scmi: Fix asynchronous reset requests

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Message-Id: <20220817172731.1185305-6-cristian.marussi@arm.com>
Date:   Wed, 17 Aug 2022 18:27:30 +0100
From:   Cristian Marussi <cristian.marussi@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     sudeep.holla@....com, cristian.marussi@....com
Subject: [PATCH 5/6] firmware: arm_scmi: Fix asynchronous reset requests

SCMI Reset protocol specification allows for asynchronous reset request
only when an Autonomous Reset action is specified: reset requests based on
explicit assert/deassert of signals should not be served asynchronously.

Current implementation will instead issue an asynchronous request in any
case, as long as the reset domain had advertised to support asynchronous
resets.

Avoid requesting asynchronous resets when the reset action is not of the
Autonomous type, even if the target reset-domain does, in general, support
asynchronous requests.

Fixes: 95a15d80aa0d ("firmware: arm_scmi: Add RESET protocol in SCMI v2.0")
Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
 drivers/firmware/arm_scmi/reset.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/arm_scmi/reset.c b/drivers/firmware/arm_scmi/reset.c
index b0494165b1cb..e9afa8cab730 100644
--- a/drivers/firmware/arm_scmi/reset.c
+++ b/drivers/firmware/arm_scmi/reset.c
@@ -172,7 +172,7 @@ static int scmi_domain_reset(const struct scmi_protocol_handle *ph, u32 domain,
 		return -EINVAL;
 
 	rdom = pi->dom_info + domain;
-	if (rdom->async_reset)
+	if (rdom->async_reset && flags & AUTONOMOUS_RESET)
 		flags |= ASYNCHRONOUS_RESET;
 
 	ret = ph->xops->xfer_get_init(ph, RESET, sizeof(*dom), 0, &t);
@@ -184,7 +184,7 @@ static int scmi_domain_reset(const struct scmi_protocol_handle *ph, u32 domain,
 	dom->flags = cpu_to_le32(flags);
 	dom->reset_state = cpu_to_le32(state);
 
-	if (rdom->async_reset)
+	if (flags & ASYNCHRONOUS_RESET)
 		ret = ph->xops->do_xfer_with_response(ph, t);
 	else
 		ret = ph->xops->do_xfer(ph, t);
-- 
2.32.0