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mb/prodrive/atlas: Add Kconfig option to enable SaGv 

It turns out that one can use Kconfig options to specify values for
devicetree options, as long as the resulting expression is a compile
time constant. Use this to configure SaGv for Atlas: enable it by
default, but allow SaGv to be disabled manually for convenience when
testing. Enabling SaGv makes MRC train the RAM multiple times, which
takes a significant amount of time.

For further info on SAGV on ADL, please refer to Intel Doc 655258
(Alder Lake Datasheet) section 5.1.3.2.

Signed-off-by: Lean Sheng Tan <sheng.tan@9elements.com>
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Change-Id: I3c6ac25d414122c408f2348d12dba8dce909e567
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67412
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Lean Sheng Tan 2022-09-07 16:25:52 +02:00 committed by Felix Held
parent 1ec8f97782
commit 2ddcf409c3
2 changed files with 7 additions and 0 deletions
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4
src/mainboard/prodrive/atlas/Kconfig
View File

@ -16,6 +16,10 @@ config BOARD_PRODRIVE_ATLAS_BASEBOARD
if BOARD_PRODRIVE_ATLAS_BASEBOARD if BOARD_PRODRIVE_ATLAS_BASEBOARD
config ATLAS_ENABLE_SAGV
bool "Enable SaGv"
default y
config MAINBOARD_FAMILY config MAINBOARD_FAMILY
string string
default "PRODRIVE_ATLAS_SERIES" default "PRODRIVE_ATLAS_SERIES"

3
src/mainboard/prodrive/atlas/devicetree.cb
View File

@ -14,6 +14,9 @@ chip soc/intel/alderlake
# EC memory map range is 0x900-0x9ff # EC memory map range is 0x900-0x9ff
register "gen3_dec" = "0x00fc0901" register "gen3_dec" = "0x00fc0901"
# SaGv Configuration
register "sagv" = "CONFIG(ATLAS_ENABLE_SAGV) ? SaGv_Enabled : SaGv_Disabled"
# Display configuration (4 DPs) # Display configuration (4 DPs)
register "ddi_ports_config" = "{ register "ddi_ports_config" = "{
[DDI_PORT_A] = DDI_ENABLE_HPD | DDI_ENABLE_DDC, [DDI_PORT_A] = DDI_ENABLE_HPD | DDI_ENABLE_DDC,