[U-Boot] [PATCH 06/22] x86: Store and display previous sleep state

[Bin Meng]

Add one member in the global data to store previous sleep state,
and display the state during boot in print_cpuinfo().

Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
---

 arch/x86/cpu/cpu.c                 |  6 ++++++
 arch/x86/include/asm/acpi_s3.h     | 20 ++++++++++++++++++++
 arch/x86/include/asm/global_data.h |  3 +++
 arch/x86/lib/fsp/fsp_common.c      |  1 +
 4 files changed, 30 insertions(+)

diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
index 8fa6953..9dde54c 100644
--- a/arch/x86/cpu/cpu.c
+++ b/arch/x86/cpu/cpu.c
@@ -25,6 +25,7 @@
 #include <errno.h>
 #include <malloc.h>
 #include <syscon.h>
+#include <asm/acpi_s3.h>
 #include <asm/control_regs.h>
 #include <asm/coreboot_tables.h>
 #include <asm/cpu.h>
@@ -179,6 +180,11 @@ int default_print_cpuinfo(void)
 	       cpu_has_64bit() ? "x86_64" : "x86",
 	       cpu_vendor_name(gd->arch.x86_vendor), gd->arch.x86_device);
 
+#ifdef CONFIG_HAVE_ACPI_RESUME
+	printf("ACPI previous sleep state: %s\n",
+	       acpi_ss_string(gd->arch.prev_sleep_state));
+#endif
+
 	return 0;
 }
 
diff --git a/arch/x86/include/asm/acpi_s3.h b/arch/x86/include/asm/acpi_s3.h
index 74878c1..c1cdbd0 100644
--- a/arch/x86/include/asm/acpi_s3.h
+++ b/arch/x86/include/asm/acpi_s3.h
@@ -36,6 +36,26 @@ enum acpi_sleep_state {
 	ACPI_S5,
 };
 
+/* Given the ACPI sleep state return the state string */
+static inline char *acpi_ss_string(enum acpi_sleep_state state)
+{
+	switch (state) {
+	case ACPI_S0:
+		return "S0";
+	case ACPI_S1:
+		return "S1";
+	case ACPI_S2:
+		return "S2";
+	case ACPI_S3:
+		return "S3";
+	case ACPI_S4:
+		return "S4";
+	case ACPI_S5:
+	default:
+		return "S5";
+	}
+}
+
 /* Given the provided PM1 control register return the ACPI sleep type */
 static inline enum acpi_sleep_state acpi_sleep_from_pm1(u32 pm1_cnt)
 {
diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h
index 4570bc7..7d5efea 100644
--- a/arch/x86/include/asm/global_data.h
+++ b/arch/x86/include/asm/global_data.h
@@ -99,6 +99,9 @@ struct arch_global_data {
 	u32 high_table_ptr;
 	u32 high_table_limit;
 #endif
+#ifdef CONFIG_HAVE_ACPI_RESUME
+	int prev_sleep_state;		/* Previous sleep state */
+#endif
 };
 
 #endif
diff --git a/arch/x86/lib/fsp/fsp_common.c b/arch/x86/lib/fsp/fsp_common.c
index 2058ee3..2b33fba 100644
--- a/arch/x86/lib/fsp/fsp_common.c
+++ b/arch/x86/lib/fsp/fsp_common.c
@@ -77,6 +77,7 @@ int x86_fsp_init(void)
 	int boot_mode = BOOT_FULL_CONFIG;
 #ifdef CONFIG_HAVE_ACPI_RESUME
 	int prev_sleep_state = chipset_prev_sleep_state();
+	gd->arch.prev_sleep_state = prev_sleep_state;
 #endif
 
 	if (!gd->arch.hob_list) {
-- 
2.9.2