linux-kernel - [PATCH v4 4/4] firmware: ti_sci: add support for restoring clock context during resume

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Message-Id: <20260204-ti-sci-jacinto-s2r-restore-irq-v4-4-67820af39eac@bootlin.com>
Date: Wed, 04 Feb 2026 16:03:41 +0100
From: "Thomas Richard (TI)" <thomas.richard@...tlin.com>
To: Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>, 
 Santosh Shilimkar <ssantosh@...nel.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>
Cc: Gregory CLEMENT <gregory.clement@...tlin.com>, 
 richard.genoud@...tlin.com, Udit Kumar <u-kumar1@...com>, 
 Prasanth Mantena <p-mantena@...com>, Abhash Kumar <a-kumar2@...com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-clk@...r.kernel.org, 
 "Thomas Richard (TI)" <thomas.richard@...tlin.com>
Subject: [PATCH v4 4/4] firmware: ti_sci: add support for restoring clock
 context during resume

Some DM-Firmware are not able to restore the clock rates and the clock
parents after a suspend-resume. The CLK_CONTEXT_LOST firmware capability
has been introduced to identify this characteristic. In this case the
responsibility is therefore delegated to the ti_sci driver, which uses
clk_restore_context() to trigger the context_restore() operation for all
registered clocks, including those managed by the sci-clk. The sci-clk
driver implements the context_restore() operation to ensure rates and clock
parents are correctly restored.

Signed-off-by: Thomas Richard (TI) <thomas.richard@...tlin.com>
---
 drivers/firmware/ti_sci.c | 9 +++++++--
 drivers/firmware/ti_sci.h | 2 ++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
index 8e43e69ef7c4..01cbfedaf4be 100644
--- a/drivers/firmware/ti_sci.c
+++ b/drivers/firmware/ti_sci.c
@@ -9,6 +9,7 @@
 #define pr_fmt(fmt) "%s: " fmt, __func__
 
 #include <linux/bitmap.h>
+#include <linux/clk.h>
 #include <linux/cpu.h>
 #include <linux/debugfs.h>
 #include <linux/export.h>
@@ -3981,6 +3982,9 @@ static int ti_sci_resume_noirq(struct device *dev)
 					return ret;
 			}
 		}
+
+		if (info->fw_caps & MSG_FLAG_CAPS_LPM_CLK_CONTEXT_LOST)
+			clk_restore_context();
 		break;
 	default:
 		break;
@@ -4141,14 +4145,15 @@ static int ti_sci_probe(struct platform_device *pdev)
 	}
 
 	ti_sci_msg_cmd_query_fw_caps(&info->handle, &info->fw_caps);
-	dev_dbg(dev, "Detected firmware capabilities: %s%s%s%s%s%s%s\n",
+	dev_dbg(dev, "Detected firmware capabilities: %s%s%s%s%s%s%s%s\n",
 		info->fw_caps & MSG_FLAG_CAPS_GENERIC ? "Generic" : "",
 		info->fw_caps & MSG_FLAG_CAPS_LPM_PARTIAL_IO ? " Partial-IO" : "",
 		info->fw_caps & MSG_FLAG_CAPS_LPM_DM_MANAGED ? " DM-Managed" : "",
 		info->fw_caps & MSG_FLAG_CAPS_LPM_ABORT ? " LPM-Abort" : "",
 		info->fw_caps & MSG_FLAG_CAPS_IO_ISOLATION ? " IO-Isolation" : "",
 		info->fw_caps & MSG_FLAG_CAPS_LPM_BOARDCFG_MANAGED ? " BoardConfig-Managed" : "",
-		info->fw_caps & MSG_FLAG_CAPS_LPM_IRQ_CONTEXT_LOST ? " IRQ-Context-Lost" : ""
+		info->fw_caps & MSG_FLAG_CAPS_LPM_IRQ_CONTEXT_LOST ? " IRQ-Context-Lost" : "",
+		info->fw_caps & MSG_FLAG_CAPS_LPM_CLK_CONTEXT_LOST ? " Clk-Context-Lost" : ""
 	);
 
 	ti_sci_setup_ops(info);
diff --git a/drivers/firmware/ti_sci.h b/drivers/firmware/ti_sci.h
index 67f16e8c69a1..2d75667a6723 100644
--- a/drivers/firmware/ti_sci.h
+++ b/drivers/firmware/ti_sci.h
@@ -152,6 +152,7 @@ struct ti_sci_msg_req_reboot {
  *		MSG_FLAG_CAPS_IO_ISOLATION: IO Isolation support
  *		MSG_FLAG_CAPS_LPM_BOARDCFG_MANAGED: LPM config done statically for the DM via boardcfg
  *		MSG_FLAG_CAPS_LPM_IRQ_CONTEXT_LOST: DM is not able to restore IRQ context
+ *		MSG_FLAG_CAPS_LPM_CLK_CONTEXT_LOST: DM is not able to restore Clock context
  *
  * Response to a generic message with message type TI_SCI_MSG_QUERY_FW_CAPS
  * providing currently available SOC/firmware capabilities. SoC that don't
@@ -166,6 +167,7 @@ struct ti_sci_msg_resp_query_fw_caps {
 #define MSG_FLAG_CAPS_IO_ISOLATION	TI_SCI_MSG_FLAG(7)
 #define MSG_FLAG_CAPS_LPM_BOARDCFG_MANAGED	TI_SCI_MSG_FLAG(12)
 #define MSG_FLAG_CAPS_LPM_IRQ_CONTEXT_LOST	TI_SCI_MSG_FLAG(14)
+#define MSG_FLAG_CAPS_LPM_CLK_CONTEXT_LOST	TI_SCI_MSG_FLAG(15)
 #define MSG_MASK_CAPS_LPM		GENMASK_ULL(4, 1)
 	u64 fw_caps;
 } __packed;

-- 
2.51.0