mb/google/nissa/var/gothrax: Tune eMMC DLL values
Gothrax cannot boot into OS with a kernel loading failure.
Update eMMC DLL values to improve initialization reliability
How to get these values:
- Sending different speed TX/RX command/data signal to eMMC and check
the response is successful or not.
- Collecting above results from each eMMC model that project used.
- Analysing logs to provide a fine tuned DLL values.
BUG=b:310701323
TEST=Cold reboot stress test over 2500 cycles
Change-Id: Ie36cc9948e3d5dee46385e584baad141a249be79
Signed-off-by: Simon Yang <simon1.yang@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79220
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <ericllai@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
diff --git a/src/mainboard/google/brya/variants/gothrax/overridetree.cb b/src/mainboard/google/brya/variants/gothrax/overridetree.cb
index bb333aa..b36ff07 100644
--- a/src/mainboard/google/brya/variants/gothrax/overridetree.cb
+++ b/src/mainboard/google/brya/variants/gothrax/overridetree.cb
@@ -55,7 +55,7 @@
# [22:16] steps of delay for DDR50, each 125ps, range: 0 - 78.
# [14:8] steps of delay for SDR25/HS50, each 125ps, range: 0 - 119.
# [6:0] steps of delay for SDR12, each 125ps, range: 0 - 119.
- register "common_soc_config.emmc_dll.emmc_rx_cmd_data_cntl1" = "0x1C1B1D1B"
+ register "common_soc_config.emmc_dll.emmc_rx_cmd_data_cntl1" = "0x1C1B4F1B"
# EMMC RX CMD/DATA Delay 2
# Refer to EDS-Vol2-42.3.12.
@@ -66,13 +66,13 @@
# 11: Reserved
# [14:8] steps of delay for Auto Tuning Mode, each 125ps, range: 0 - 39.
# [6:0] steps of delay for HS200, each 125ps, range: 0 - 79.
- register "common_soc_config.emmc_dll.emmc_rx_cmd_data_cntl2" = "0x1004c"
+ register "common_soc_config.emmc_dll.emmc_rx_cmd_data_cntl2" = "0x10005"
# EMMC Rx Strobe Delay
# Refer to EDS-Vol2-42.3.11.
# [14:8] Rx Strobe Delay DLL 1(HS400 Mode), each 125ps, range: 0 - 39.
# [6:0] Rx Strobe Delay DLL 2(HS400 Mode), each 125ps, range: 0 - 39.
- register "common_soc_config.emmc_dll.emmc_rx_strobe_cntl" = "0x01515"
+ register "common_soc_config.emmc_dll.emmc_rx_strobe_cntl" = "0x11515"
# Bit 0 - C0 has no redriver, so enable SBU muxing in the SoC.
# Bit 2 - C1 has a redriver which does SBU muxing.