linux-kernel - [PATCH RFC v2 4/4] firmware: ti_sci: restore clock context during resume in BOARDCFG

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Message-Id: <20251127-ti-sci-jacinto-s2r-restore-irq-v2-4-a487fa3ff221@bootlin.com>
Date: Thu, 27 Nov 2025 09:38:58 +0100
From: "Thomas Richard (TI.com)" <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.com)" <thomas.richard@...tlin.com>
Subject: [PATCH RFC v2 4/4] firmware: ti_sci: restore clock context during
 resume in BOARDCFG_MANAGED mode

In BOARDCFG_MANAGED mode, the firmware cannot restore the clock parents.
This 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 driver. The
sci-clk driver implements the context_restore() operation to ensure clock
parents are correctly restored.

Signed-off-by: Thomas Richard (TI.com) <thomas.richard@...tlin.com>
---
 drivers/firmware/ti_sci.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
index a4d28f37b58ae..1e3fe00ff9109 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>
@@ -3901,6 +3902,8 @@ static int ti_sci_resume_noirq(struct device *dev)
 				if (ret)
 					return ret;
 			}
+
+			clk_restore_context();
 		}
 		break;
 	default:

-- 
2.51.0