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x86: ivybridge: Measure the MRC code execution time

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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@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2015-10-18 15:55:36 -06:00
parent e9b3967c0c
commit fd8f4729ac
1 changed files with 3 additions and 0 deletions
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3
arch/x86/cpu/ivybridge/sdram.c
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@ -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;