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mb/purism/librem_mini: Enable DRAM Refresh2X 

Enable Refresh2X to mitigate RAM corruption during long
(> 1hr) periods of S3/suspend, which leads to failure to
successfully resume from S3. Unknown if an issue with all
DRAM types, but tested w/Kingston KVR24S17D8 16GiB DDR4 SODIMMs.

Test: Build/boot Librem Mini v1/v2, put device in suspend,
wait > 1hr, ensure resume from S3 successful 100% of the time.

Change-Id: Ie8e3ebbb1ebdcd98813b5f36f580a235712d2f97
Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50756
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Matt DeVillier 2021-02-15 11:23:58 -06:00 committed by Patrick Georgi
parent 63d2008308
commit 1174dad2e2
1 changed files with 3 additions and 0 deletions
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3
src/mainboard/purism/librem_cnl/variants/librem_mini/variant.c
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@ -9,4 +9,7 @@ void variant_memory_init_params(FSP_M_CONFIG *mem_cfg)
mem_cfg->PchSataHsioRxGen3EqBoostMagEnable[2] = 1;
mem_cfg->PchSataHsioRxGen3EqBoostMag[0] = 2;
mem_cfg->PchSataHsioRxGen3EqBoostMag[2] = 1;
/* Enable Refresh2X to mitigate S3 resume issues */
mem_cfg->Refresh2X = 1;
}