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| author | Subrata Banik <subratabanik@google.com> | 2023-09-02 00:53:54 +0530 |
|---|---|---|
| committer | Subrata Banik <subratabanik@google.com> | 2023-09-02 14:42:19 +0000 |
| commit | 96f7bd13180f284ae0dd700f3bd73a6b61139846 (patch) | |
| tree | 1d27815b9df515d053dfb5323726148c333ee63f /src/superio/ite/it8720f/acpi | |
| parent | 2aeb6e405aea8740f87185158598f2af50390904 (diff) | |
soc/intel/meteorlake: Fix black screen after booting to OS
This patch ensures that the VR configuration for IA, SA, and GFX is
properly initialized, assigning zero values to VR causes a black screen
(no display) issue.
Problem Statement:
Override CEP (Current Excursion Protection) value with zero aka set to
disable results into black screen issue (no display).
Solution:
Keep CEP default enabled and don't override w/ zero value.
w/o this patch:
[SPEW ] CPU_POWER_MGMT_VR_CONFIG : CepEnable[0] : 0x0
[SPEW ] CPU_POWER_MGMT_VR_CONFIG : CepEnable[1] : 0x0
[SPEW ] CPU_POWER_MGMT_VR_CONFIG : CepEnable[2] : 0x0
w/ this patch:
[SPEW ] CPU_POWER_MGMT_VR_CONFIG : CepEnable[0] : 0x1
[SPEW ] CPU_POWER_MGMT_VR_CONFIG : CepEnable[1] : 0x1
[SPEW ] CPU_POWER_MGMT_VR_CONFIG : CepEnable[2] : 0x1
Change-Id: I8908e8b6c995390b559212d456db6ddf984448a3
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77611
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eran Mitrani <mitrani@google.com>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Diffstat (limited to 'src/superio/ite/it8720f/acpi')
0 files changed, 0 insertions, 0 deletions