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soc/intel/apollolake: Move privilege drop to later stage

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Previously privilege drop was happening "too early" and that caused some
PMC IPC programming (performed in FSP) to fail because sideband was
already locked out. This change set moves privilege drop to later stage,
after last FSP notify call.

BRANCH=reef
BUG=chrome-os-partner:60657
TEST=iotools rdmsr X 0x121, make sure they can't be read.
Also dmesg|grep -i IPC to make sure there are no errors related

Change-Id: Ia3a774aee5fbf92805a5c69093bfbd3d7682c3a7
Signed-off-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-on: https://review.coreboot.org/17769
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Andrey Petrov
2016-12-07 10:47:46 -08:00
committed by Aaron Durbin
parent b21e362e93
commit a697c19640
4 changed files with 21 additions and 5 deletions
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4
src/soc/intel/apollolake/cpu.c
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@@ -53,7 +53,7 @@ static const struct reg_script core_msr_script[] = {
REG_SCRIPT_END
};
static void enable_untrusted_mode(void)
void enable_untrusted_mode(void)
{
msr_t msr = rdmsr(MSR_POWER_MISC);
msr.lo |= ENABLE_IA_UNTRUSTED;
@@ -70,8 +70,6 @@ static void soc_core_init(device_t cpu)
* implemented in microcode.
*/
enable_pm_timer_emulation();
/* Drop privilege level */
enable_untrusted_mode();
}
static struct device_operations cpu_dev_ops = {