[U-Boot] [PATCH 8/9] x86: ivybridge: Measure the MRC code execution time

[Bin Meng]

On Mon, Oct 19, 2015 at 5:55 AM, Simon Glass <sjg at chromium.org> wrote:
> This code takes about 450ms without the MRC cache and about 27ms with the
> cache. Add a debug timer so that this time can be displayed.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
>
>  arch/x86/cpu/ivybridge/sdram.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/arch/x86/cpu/ivybridge/sdram.c b/arch/x86/cpu/ivybridge/sdram.c
> index e637909..d9b3dfc 100644
> --- a/arch/x86/cpu/ivybridge/sdram.c
> +++ b/arch/x86/cpu/ivybridge/sdram.c
> @@ -336,9 +336,11 @@ int sdram_initialise(struct pei_data *pei_data)
>         if (data) {
>                 int rv;
>                 int (*func)(struct pei_data *);
> +               ulong start;
>
>                 debug("Calling MRC at %p\n", data);
>                 post_code(POST_PRE_MRC);
> +               start = get_timer(0);
>                 func = (int (*)(struct pei_data *))data;
>                 rv = func(pei_data);
>                 post_code(POST_MRC);
> @@ -356,6 +358,7 @@ int sdram_initialise(struct pei_data *pei_data)
>                         printf("Nonzero MRC return value.\n");
>                         return -EFAULT;
>                 }
> +               debug("MRC execution time %lu ms\n", get_timer(start));
>         } else {
>                 printf("UEFI PEI System Agent not found.\n");
>                 return -ENOSYS;
> --

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