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@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

Author: chenhuacai

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