linux-kernel - [PATCH] LoongArch: Enable PG when wakeup from suspend

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Message-Id: <20230411094959.3368451-1-chenhuacai@loongson.cn>
Date:   Tue, 11 Apr 2023 17:49:59 +0800
From:   Huacai Chen <chenhuacai@...ngson.cn>
To:     Arnd Bergmann <arnd@...db.de>, Huacai Chen <chenhuacai@...nel.org>
Cc:     loongarch@...ts.linux.dev, linux-arch@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-kernel@...r.kernel.org, loongson-kernel@...ts.loongnix.cn,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Baoqi Zhang <zhangbaoqi@...ngson.cn>
Subject: [PATCH] LoongArch: Enable PG when wakeup from suspend

Some firmwares don't enable PG when wakeup from suspend, so do it in
kernel. This can improve code compatibility for boot kernel.

Signed-off-by: Baoqi Zhang <zhangbaoqi@...ngson.cn>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
 arch/loongarch/power/suspend_asm.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/loongarch/power/suspend_asm.S b/arch/loongarch/power/suspend_asm.S
index 90da899c06a1..e2fc3b4e31f0 100644
--- a/arch/loongarch/power/suspend_asm.S
+++ b/arch/loongarch/power/suspend_asm.S
@@ -80,6 +80,10 @@ SYM_INNER_LABEL(loongarch_wakeup_start, SYM_L_GLOBAL)
 
 	JUMP_VIRT_ADDR	t0, t1
 
+	/* Enable PG */
+	li.w		t0, 0xb0		# PLV=0, IE=0, PG=1
+	csrwr		t0, LOONGARCH_CSR_CRMD
+
 	la.pcrel	t0, acpi_saved_sp
 	ld.d		sp, t0, 0
 	SETUP_WAKEUP
-- 
2.39.1