Change in coreboot[master]: mb/purism/librem_mini: Enable DRAM Refresh2X

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change. ( https://review.coreboot.org/c/coreboot/+/50756 )

Change subject: mb/purism/librem_mini: Enable DRAM Refresh2X
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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 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50756
Reviewed-by: Angel Pons 
Reviewed-by: Paul Menzel 
Tested-by: build bot (Jenkins) 
---
M src/mainboard/purism/librem_cnl/variants/librem_mini/variant.c
1 file changed, 3 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Paul Menzel: Looks good to me, but someone else must approve
  Angel Pons: Looks good to me, approved

diff --git a/src/mainboard/purism/librem_cnl/variants/librem_mini/variant.c b/src/mainboard/purism/librem_cnl/variants/librem_mini/variant.c
index 9d7e27f..4f415c4 100644
--- a/src/mainboard/purism/librem_cnl/variants/librem_mini/variant.c
+++ b/src/mainboard/purism/librem_cnl/variants/librem_mini/variant.c
@@ -9,4 +9,7 @@
    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;
 }