diff options
| author | Subrata Banik <subrata.banik@intel.com> | 2017-07-04 15:56:41 +0530 |
|---|---|---|
| committer | Duncan Laurie <dlaurie@chromium.org> | 2017-07-12 04:00:13 +0000 |
| commit | 1914337936dde751fe43735a62b7222861f7fcec (patch) | |
| tree | b42debf3dc1c84859297285b544b90529fc69912 /src | |
| parent | fa2786a01008588f0effb92874e776c668c63b22 (diff) | |
soc/intel/skylake: Perform PCR read after all PCR write
BIOS must ensure to read same PCR offset after PCR write operation
is done.
BUG=b:35587084
BRANCH=eve
TEST=manual stress testing of D0<->D3 transition on eve failing
unit. No hard hang with this fix.
Change-Id: Id3d567aab517b16ff99a526fc29c2d71bf4042d0
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/20461
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Diffstat (limited to 'src')
| -rw-r--r-- | src/soc/intel/skylake/acpi/pcr.asl | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/soc/intel/skylake/acpi/pcr.asl b/src/soc/intel/skylake/acpi/pcr.asl index 4b8576b804..c73830fe46 100644 --- a/src/soc/intel/skylake/acpi/pcr.asl +++ b/src/soc/intel/skylake/acpi/pcr.asl @@ -53,6 +53,14 @@ Method (PCRA, 3, Serialized) DATA, 32 } And (DATA, Arg2, DATA) + + /* + * After every write one needs to read an innocuous register + * to ensure the writes are completed for certain ports. This is done + * for all ports so that the callers don't need the per-port knowledge + * for each transaction. + */ + PCRR (Arg0, Arg1) } /* @@ -69,4 +77,12 @@ Method (PCRO, 3, Serialized) DATA, 32 } Or (DATA, Arg2, DATA) + + /* + * After every write one needs to read an innocuous register + * to ensure the writes are completed for certain ports. This is done + * for all ports so that the callers don't need the per-port knowledge + * for each transaction. + */ + PCRR (Arg0, Arg1) } |