mb/siemens/mc_ehl: Disable HS400 mode for eMMC
In order to achieve a stable eMMC interface disable the HS400 capability
of the host controller. This will result in an operating mode of maximum
HS200 (200 MHz single data rate) which leads to a more relaxed timing.
Change-Id: I0e125dd569b00f59ae0fd2f76169c4461291b47a
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62325
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>
diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl1/devicetree.cb b/src/mainboard/siemens/mc_ehl/variants/mc_ehl1/devicetree.cb
index 87b455f..d7c3e22 100644
--- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl1/devicetree.cb
+++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl1/devicetree.cb
@@ -84,7 +84,7 @@
register "SataPortsDevSlp[0]" = "0"
register "SataPortsDevSlp[1]" = "0"
- register "ScsEmmcHs400Enabled" = "1"
+ register "ScsEmmcHs400Enabled" = "0"
register "ScsEmmcDdr50Enabled" = "1"
register "SdCardPowerEnableActiveHigh" = "1"
diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
index 438419a..ffcf1da 100644
--- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
+++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
@@ -69,7 +69,7 @@
register "PcieRpLtrDisable[6]" = "true"
# Storage (SDCARD/EMMC) related UPDs
- register "ScsEmmcHs400Enabled" = "1"
+ register "ScsEmmcHs400Enabled" = "0"
register "ScsEmmcDdr50Enabled" = "1"
register "SdCardPowerEnableActiveHigh" = "1"