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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>
This commit is contained in:
Furquan Shaikh 2018-03-01 16:37:06 -08:00
parent 10c3b96ac7
commit fa9f107319
1 changed files with 6 additions and 1 deletions
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7
src/cpu/x86/mp_init.c
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@ -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;