soc/intel/cannonlake: Add support for EMMC DLL update

Add option to have customized DLL setting for EMMC interface to make
EMMC able to run at HS400 speed.

BUG=None

Change-Id: I38bc022d8c05dd1fbd03dc26aa6f33cd249e8248
Signed-off-by: Lijian Zhao <lijian.zhao@intel.com>
Reviewed-on: https://review.coreboot.org/23600
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

2 files changed, 12 insertions, 1 deletions

diff --git a/src/soc/intel/cannonlake/chip.c b/src/soc/intel/cannonlake/chip.c
index f05b55abf5..68f95d3df3 100644
--- a/src/soc/intel/cannonlake/chip.c
+++ b/src/soc/intel/cannonlake/chip.c
@@ -262,6 +262,12 @@ void platform_fsp_silicon_init_params_cb(FSPS_UPD *supd)
 	/* eMMC and SD */
 	params->ScsEmmcEnabled = config->ScsEmmcEnabled;
 	params->ScsEmmcHs400Enabled = config->ScsEmmcHs400Enabled;
+	params->PchScsEmmcHs400DllDataValid = config->EmmcHs400DllNeed;
+	if (config->EmmcHs400DllNeed == 1) {
+		params->PchScsEmmcHs400RxStrobeDll1 =
+			config->EmmcHs400RxStrobeDll1;
+		params->PchScsEmmcHs400TxDataDll = config->EmmcHs400TxDataDll;
+	}
 	params->ScsSdCardEnabled = config->ScsSdCardEnabled;
 	params->ScsUfsEnabled = config->ScsUfsEnabled;
 
diff --git a/src/soc/intel/cannonlake/chip.h b/src/soc/intel/cannonlake/chip.h
index a42494c71d..5d1b714de9 100644
--- a/src/soc/intel/cannonlake/chip.h
+++ b/src/soc/intel/cannonlake/chip.h
@@ -155,7 +155,12 @@ struct soc_intel_cannonlake_config {
 	/* eMMC and SD */
 	uint8_t ScsEmmcEnabled;
 	uint8_t ScsEmmcHs400Enabled;
-	uint8_t PchScsEmmcHs400TuningRequired;
+	/* Need to update DLL setting to get Emmc running at HS400 speed */
+	uint8_t EmmcHs400DllNeed;
+	/* 0-39: number of active delay for RX strobe, unit is 125 psec */
+	uint8_t EmmcHs400RxStrobeDll1;
+	/* 0-78: number of active delay for TX data, unit is 125 psec */
+	uint8_t EmmcHs400TxDataDll;
 	uint8_t ScsSdCardEnabled;
 	uint8_t ScsUfsEnabled;