linux-kernel - [PATCH 6/8] firmware: arm_scmi: Add SCMIV4.0 Powercap notifications support

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Message-ID: <20250813114609.1305571-7-cristian.marussi@arm.com>
Date: Wed, 13 Aug 2025 12:46:07 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	arm-scmi@...r.kernel.org,
	linux-pm@...r.kernel.org
Cc: sudeep.holla@....com,
	james.quinlan@...adcom.com,
	f.fainelli@...il.com,
	vincent.guittot@...aro.org,
	etienne.carriere@...com,
	peng.fan@....nxp.com,
	michal.simek@....com,
	quic_sibis@...cinc.com,
	dan.carpenter@...aro.org,
	d-gole@...com,
	souvik.chakravarty@....com,
	Cristian Marussi <cristian.marussi@....com>
Subject: [PATCH 6/8] firmware: arm_scmi: Add SCMIV4.0 Powercap notifications support

Extend notification support to the new SCMIv4.0 Powercap format that carry
also a CPL identifier where specified.

Since this addition completes SCMIv4.0 Powercap support bump also the
protocol version define.

Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
 drivers/firmware/arm_scmi/powercap.c | 13 +++++++++----
 include/linux/scmi_protocol.h        |  3 ++-
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/firmware/arm_scmi/powercap.c b/drivers/firmware/arm_scmi/powercap.c
index 1c4b79249c40..350dd1f135ca 100644
--- a/drivers/firmware/arm_scmi/powercap.c
+++ b/drivers/firmware/arm_scmi/powercap.c
@@ -18,7 +18,7 @@
 #include "notify.h"
 
 /* Updated only after ALL the mandatory features for that version are merged */
-#define SCMI_PROTOCOL_SUPPORTED_VERSION		0x20000
+#define SCMI_PROTOCOL_SUPPORTED_VERSION		0x30000
 
 #define CPL0	0
 
@@ -156,7 +156,8 @@ struct scmi_powercap_cap_changed_notify_payld {
 	__le32 agent_id;
 	__le32 domain_id;
 	__le32 power_cap;
-	__le32 pai;
+	__le32 avg_ivl;
+	__le32 cpli;
 };
 
 struct scmi_powercap_meas_changed_notify_payld {
@@ -1308,14 +1309,18 @@ scmi_powercap_fill_custom_report(const struct scmi_protocol_handle *ph,
 		const struct scmi_powercap_cap_changed_notify_payld *p = payld;
 		struct scmi_powercap_cap_changed_report *r = report;
 
-		if (sizeof(*p) != payld_sz)
+		if (sizeof(*p) > payld_sz)
 			break;
 
 		r->timestamp = timestamp;
 		r->agent_id = le32_to_cpu(p->agent_id);
 		r->domain_id = le32_to_cpu(p->domain_id);
 		r->power_cap = le32_to_cpu(p->power_cap);
-		r->pai = le32_to_cpu(p->pai);
+		r->avg_ivl = le32_to_cpu(p->avg_ivl);
+		if (sizeof(*p) == payld_sz)
+			r->cpli = le32_to_cpu(p->cpli);
+		else
+			r->cpli = 0;
 		*src_id = r->domain_id;
 		rep = r;
 		break;
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index a98213bff60a..303d9183e1da 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -1125,7 +1125,8 @@ struct scmi_powercap_cap_changed_report {
 	unsigned int	agent_id;
 	unsigned int	domain_id;
 	unsigned int	power_cap;
-	unsigned int	pai;
+	unsigned int	avg_ivl;
+	unsigned int	cpli;
 };
 
 struct scmi_powercap_meas_changed_report {
-- 
2.47.0