mb/google/brya: Set eMMC dll tuning parameters for Nissa

Add support for MB level dll tuning.

This patch sets the eMMC dll tuning parameters to default values needed.
There was issue observed on some eMMC devices which failed to boot in
HS400 mode.EV team suggested the intermediate eMMC dll tuning parameters
that needs to be set. We observed these values helped to fix the issue.

While we get the verified default values set from FSP directly, adding
it here to use it as the custom dll values needed.

BUG=b:230403441
TEST=Build and boot nivviks board. Verify the eMMC dll parameters are
overridden.
[INFO ]  usha: After override dll_params
[INFO ]  usha: emmc_tx_cmd_cntl=505
[INFO ]  usha: emmc_tx_data_cntl1=909
[INFO ]  usha: emmc_tx_data_cntl2=1c2a2828
[INFO ]  usha: emmc_rx_cmd_data_cntl1=1c1b1d3c
[INFO ]  usha: emmc_rx_cmd_data_cntl2=10049
[INFO ]  usha: emmc_rx_strobe_cntl=11515

Signed-off-by: Usha P <usha.p@intel.com>
Change-Id: I27771b663ce9808e5a5ef4b36c136ad78f924376
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64203
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Reka Norman <rekanorman@chromium.org>
Reviewed-by: Kangheui Won <khwon@chromium.org>

0 files changed, 0 insertions, 0 deletions