soc/intel/{adl, cmn}: Send CSE EOP Async CMD early
This patch sends the CSE EOP command asynchronous implementation early
as part of `soc_init_pre_device`.
Without this patch the duration between asynchronous CSE EOP send and
receive commands is not ample whichcauses idle delay while waiting
for EOP response.
The goal of the CSE async implementation is to avoid idle delay while
capturing the response from CSE EOP cmd.
This patch helps to create ample duration between CSE EOP command
being sent and response being captured.
TEST=Able to boot google/marasov EVT sku to ChromeOS and observed
~30ms of boot time savings (across warm and cold reset scenarios).
Without this patch:
963:returning from FspMultiPhaseSiInit 907,326 (97,293)
...
...
115:finished elog init 967,343 (2,581)
942:before sending EOP to ME 967,821 (478)
…
16:finished LZMA decompress (ignore for x86) 1,017,937 (12,135)
943:after sending EOP to ME 1,067,799 (49,861)
…
…
1101:jumping to kernel 1,144,587 (13,734)
Total Time: 1,144,549
With this patch:
963:returning from FspMultiPhaseSiInit 918,291 (97,320)
942:before sending EOP to ME 918,522 (230)
...
...
16:finished LZMA decompress (ignore for x86) 1,029,476 (12,483)
943:after sending EOP to ME 1,033,456 (3,980)
...
...
1101:jumping to kernel 1,111,410 (14,007)
Total Time: 1,111,375
Change-Id: Idaf45ef28747bebc02347f0faa77cc858a4a8ef1
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74293
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tarun Tuli <taruntuli@google.com>
diff --git a/src/soc/intel/alderlake/chip.c b/src/soc/intel/alderlake/chip.c
index e0aa983..25b412e 100644
--- a/src/soc/intel/alderlake/chip.c
+++ b/src/soc/intel/alderlake/chip.c
@@ -203,7 +203,8 @@
* current boot sequence) to reduce message response time from CSE hence moving
* sending EOP to earlier stage.
*/
- if (CONFIG(SOC_INTEL_CSE_SEND_EOP_EARLY)) {
+ if (CONFIG(SOC_INTEL_CSE_SEND_EOP_EARLY) ||
+ CONFIG(SOC_INTEL_CSE_SEND_EOP_ASYNC)) {
printk(BIOS_INFO, "Sending EOP early from SoC\n");
cse_send_end_of_post();
}