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lm4: Fixes low power bug after a sysjump

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This fixes a bug in which after a sysjump, the sleep_mask is
reset, and the EC is allowed to go into a low power mode even
though the AP is still running. This causes numerous problems,
must notable of which is that a flashrom write fails with an
EC protocol mismatch error.

BUG=chrome-os-partner:23645
BRANCH=none
TEST=Execute a flashrom write and make sure the system does not
use the low power code immediately after.

Change-Id: I4d50282da0c5ba5b6488ed14a267a4d8cafe09a7
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/174943
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Alec Berg
2013-10-29 09:28:10 -07:00
committed by chrome-internal-fetch
parent fea89f9cd9
commit 7e78087a91
1 changed files with 2 additions and 0 deletions
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2
power/haswell.c
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@@ -129,6 +129,8 @@ enum x86_state x86_chipset_init(void)
*/
if (system_jumped_to_this_image()) {
if ((x86_get_signals() & IN_ALL_S0) == IN_ALL_S0) {
/* Disable idle task deep sleep when in S0. */
disable_sleep(SLEEP_MASK_AP_RUN);
CPRINTF("[%T x86 already in S0]\n");
return X86_S0;
} else {