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| author | Arthur Heymans <arthur@aheymans.xyz> | 2016-05-19 16:02:38 +0200 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-10-11 23:34:18 +0200 |
| commit | e1f0ac4baa1bbe561276bee8ebc20fe86b0f8cc2 (patch) | |
| tree | 0529f2a7fcc717de4ce1707bea9626c9f32cd66e /src/mainboard/lenovo | |
| parent | 49a7c37de95531eb2f8037542806ec56240388be (diff) | |
| download | coreboot-e1f0ac4baa1bbe561276bee8ebc20fe86b0f8cc2.tar.xz | |
lenovo/x60: CST table: use MWAIT requests instead of P_LVLx I/O reads
Requesting low power acpi cpu c-states has two software interfaces:
Using P_LVLx I/O reads or using equivalent MWAIT requests.
This change makes it more consistent with newer targets that use MWAIT
requests.
There also exists extended intel acpi c-states which can be enabled
in two ways:
- using a substate hint to the mwait request (defined in bios);
- setting a model specific register (msr)
Currently this is done by setting the right msr bits but with this
change one can experiment by adding substate hints.
Change-Id: I9eeb5b008e2ddc2193725667f2c13582a4877e3c
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/14801
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Diffstat (limited to 'src/mainboard/lenovo')
| -rw-r--r-- | src/mainboard/lenovo/x60/mainboard.c | 33 |
1 files changed, 30 insertions, 3 deletions
diff --git a/src/mainboard/lenovo/x60/mainboard.c b/src/mainboard/lenovo/x60/mainboard.c index 5ea42215de..b1096d2262 100644 --- a/src/mainboard/lenovo/x60/mainboard.c +++ b/src/mainboard/lenovo/x60/mainboard.c @@ -38,10 +38,37 @@ #define PANEL INT15_5F35_CL_DISPLAY_DEFAULT +#define MWAIT_RES(state, sub_state) \ + { \ + .space_id = ACPI_ADDRESS_SPACE_FIXED, \ + .bit_width = ACPI_FFIXEDHW_VENDOR_INTEL, \ + .bit_offset = ACPI_FFIXEDHW_CLASS_MWAIT, \ + { \ + .resv = 0, \ + }, \ + .addrl = (((state) << 4) | (sub_state)), \ + .addrh = 0, \ + } + static acpi_cstate_t cst_entries[] = { - { 1, 1, 1000, { 0x7f, 1, 2, { 0 }, 1, 0 } }, - { 2, 1, 500, { 0x01, 8, 0, { 0 }, DEFAULT_PMBASE + LV2, 0 } }, - { 2, 17, 250, { 0x01, 8, 0, { 0 }, DEFAULT_PMBASE + LV3, 0 } }, + { + .ctype = 1, + .latency = 1, + .power = 1000, + .resource = MWAIT_RES(0, 0), + }, + { + .ctype = 2, + .latency = 1, + .power = 500, + .resource = MWAIT_RES(1, 0), + }, + { + .ctype = 3, + .latency = 17, + .power = 250, + .resource = MWAIT_RES(2, 0), + }, }; int get_cst_entries(acpi_cstate_t **entries) |