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

[Simon Glass]

Hi Bin,

On 16 March 2017 at 08:26, Bin Meng <bmeng.cn at gmail.com> wrote:
> 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(+)

Reviewed-by: Simon Glass <sjg at chromium.org>

>
> 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";

Since this is your own enum can you use a string array for this?

> +       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 */

What kind of value does this have? Can you add a little detail>

> +#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
>

Regard,
Simon