diff options
| author | Marshall Dawson <marshalldawson3rd@gmail.com> | 2018-10-02 09:23:04 -0600 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2018-10-04 09:42:42 +0000 |
| commit | aeb7f0511bdfad83978e6c54ef9353a62a79f428 (patch) | |
| tree | 43a5a7a210037b90fe9305d3a61539a0cd2e3b6f /src/soc/amd/stoneyridge | |
| parent | 723e736db972c6fb012517e82bc5815fa09eb0da (diff) | |
amd/stoneyridge: Prepare for vboot rebooting system
Implement the function vboot_platform_prepare_reboot() which is normally
a weak function.
The SlpTyp field of the PM1 register is not reset to its default value
when the APU restarts. This change prevents a failing condition if
vboot decides to reset the system instead of allowing an S3 resume to
continue.
TEST=Resume Grunt when vboot attempts a reset, verify a fresh boot instead
BUG=b:117089826
Change-Id: I6e0e3e541bad89ca5b23d6ddb6e5c0df7f762f10
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/28877
Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/soc/amd/stoneyridge')
| -rw-r--r-- | src/soc/amd/stoneyridge/pmutil.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/soc/amd/stoneyridge/pmutil.c b/src/soc/amd/stoneyridge/pmutil.c index baabba5fbb..7e5e4dfe4b 100644 --- a/src/soc/amd/stoneyridge/pmutil.c +++ b/src/soc/amd/stoneyridge/pmutil.c @@ -32,3 +32,15 @@ int vboot_platform_is_resuming(void) return acpi_sleep_from_pm1(inw(pm_acpi_pm_cnt_blk())) == ACPI_S3; } + +/* If vboot requests a system reset, modify the PM1 register so it will never be + * misinterpreted as an S3 resume. */ +void vboot_platform_prepare_reboot(void) +{ + uint16_t pm1; + + pm1 = inw(pm_acpi_pm_cnt_blk()); + pm1 &= ~SLP_TYP; + pm1 |= SLP_TYP_S5 << SLP_TYP_SHIFT; + outw(pm1, pm_acpi_pm_cnt_blk()); +} |