cpu/x86/mp_init: don't wait between INIT and SIPI for X86_AMD_INIT_SIPI
Since current AMD SoCs don't need some wait time between INIT and SIPI,
we can skip the 10ms wait there, which improves the boot time a bit.
before: CPU_CLUSTER: 0 init finished in 632 msecs
after: CPU_CLUSTER: 0 init finished in 619 msecs
mpinit still works on Mandolin and all CPU cores show up and are usable.
This also doesn't change the binary in a timeless build for boards/SoCs
that don't select X86_AMD_INIT_SIPI which I verified for lenovo/x230.
BUG=b:193885336
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I1e044776f45021742a88a5e369a74383c1baaab6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56533
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig
index 6a3bbd8..a5c2a4d 100644
--- a/src/cpu/x86/Kconfig
+++ b/src/cpu/x86/Kconfig
@@ -173,7 +173,9 @@
help
This option limits the number of SIPI signals sent during during the
common AP setup. Intel documentation specifies an INIT SIPI SIPI
- sequence, however this doesn't work on some AMD platforms.
+ sequence, however this doesn't work on some AMD platforms. These
+ newer AMD platforms don't need the 10ms wait between INIT and SIPI,
+ so skip that too to save some time.
config SOC_SETS_MSRS
bool