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| author | Furquan Shaikh <furquan@google.com> | 2018-03-01 16:37:06 -0800 |
|---|---|---|
| committer | Furquan Shaikh <furquan@google.com> | 2018-03-05 17:55:44 +0000 |
| commit | fa9f107319c00563d2da4cda03ddba179c904135 (patch) | |
| tree | 5ba23ab628c7522202f6a175a31fe7864a67e3b3 /src/cpu | |
| parent | 10c3b96ac74cf00b44fca40c83c7b13964cff08c (diff) | |
| download | coreboot-fa9f107319c00563d2da4cda03ddba179c904135.tar.xz | |
cpu/x86/mp_init: Increase AP check-in time-out to 1second
Currently, the AP check-in time-out in bsp_do_flight_plan is set to
100ms. However, as the number of APs increases, contention could
increase especially for resource like UART. This led to MP record
time-out issues on KBL platform with 7 APs and serial-console enabled
BIOS image.
This change increases the time-out value to 1 second to be on the safer
side and let APs check-in before continuing boot.
BUG=b:74085891
TEST=Verified that MP record time-out is not observed anymore on Nami.
Change-Id: I979c11a10e6888aef0f71b5632ea803a67bbb0ff
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/24965
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/x86/mp_init.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/cpu/x86/mp_init.c b/src/cpu/x86/mp_init.c index 92eb722eb4..23aea14683 100644 --- a/src/cpu/x86/mp_init.c +++ b/src/cpu/x86/mp_init.c @@ -539,7 +539,12 @@ static int bsp_do_flight_plan(struct mp_params *mp_params) { int i; int ret = 0; - const int timeout_us = 100000; + /* + * Set time-out to wait for APs to a huge value (=1 second) since it + * could take a longer time for APs to check-in as the number of APs + * increases (contention for resources like UART also increases). + */ + const int timeout_us = 1000000; const int step_us = 100; int num_aps = mp_params->num_cpus - 1; |