linux-kernel - [PATCH 09/10] MIPS: Loongson64: sleeper: Pass ra and sp as arguments

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Message-Id: <20240614-ls3k-mips-v1-9-7614340ace7d@flygoat.com>
Date: Fri, 14 Jun 2024 16:40:17 +0100
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
 Qing Zhang <zhangqing@...ngson.cn>, Binbin Zhou <zhoubinbin@...ngson.cn>, 
 Huacai Chen <chenhuacai@...nel.org>
Cc: devicetree@...r.kernel.org, linux-mips@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH 09/10] MIPS: Loongson64: sleeper: Pass ra and sp as
 arguments

Some firmware implementations require restoring ra and sp to be
passed as arguments.

Passing them as necessary.

Fixes: 68557c59a550 ("MIPS: Loongson64: Implement PM suspend for LEFI firmware")
Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 arch/mips/loongson64/sleeper.S | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/mips/loongson64/sleeper.S b/arch/mips/loongson64/sleeper.S
index 04874b9bf430..cf16877409e2 100644
--- a/arch/mips/loongson64/sleeper.S
+++ b/arch/mips/loongson64/sleeper.S
@@ -11,7 +11,11 @@
 
 LEAF(loongson_lefi_sleep)
 	SUSPEND_SAVE
-	jalr    a0
-    smp_slave_setup
+	move	t9, a0
+	PTR_LA	a0, wake
+	move	a1, sp
+	jalr    t9
+wake:
+	smp_slave_setup
 	RESUME_RESTORE_REGS_RETURN
 END(loongson_lefi_sleep)

-- 
2.43.0