Change in coreboot[master]: util/spd_tools/spd_gen/lp5: Update BusWidth Encoding

[Karthik Ramasubramanian (Code Review)]

Attention is currently required from: Reka Norman.
Karthik Ramasubramanian has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/61639 )

Change subject: util/spd_tools/spd_gen/lp5: Update BusWidth Encoding
......................................................................

util/spd_tools/spd_gen/lp5: Update BusWidth Encoding

ADL and Sabrina have different advisory regarding encoding the bus
width. Encode the bus width as per the respective advisories.

BUG=b:211510456
TEST=Build spd_gen and ensure that the bus width is encoded as expected.

Signed-off-by: Karthikeyan Ramasubramanian 
Change-Id: Ia12a5bd8f70a70ca8a510ecf00f6268c6904ec25
---
M util/spd_tools/src/spd_gen/lp5.go
1 file changed, 28 insertions(+), 9 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/39/61639/1

diff --git a/util/spd_tools/src/spd_gen/lp5.go b/util/spd_tools/src/spd_gen/lp5.go
index 22927b2..1db5b8d 100644
--- a/util/spd_tools/src/spd_gen/lp5.go
+++ b/util/spd_tools/src/spd_gen/lp5.go
@@ -57,6 +57,7 @@

type LP5Set struct {
    SPDRevision    byte
+	busWidthEncoding  byte
 }

/* ------------------------------------------------------------------------------------------ */
@@ -137,14 +138,6 @@
     */
    LP5SPDValueOptionalFeatures = 0x08

-	/*
-	 * For ADL (as per advisory #616599):
-	 * 7:5 (Number of system channels) = 000 (1 channel always)
-	 * 4:3 (Bus width extension) = 00 (no ECC)
-	 * 2:0 (Bus width) = 001 (x16 always)
-	 * Set to 0x01.
-	 */
-	LP5SPDValueBusWidth = 0x01

/*
     * From JEDEC spec:
@@ -191,9 +184,25 @@
 var LP5SetInfo = map[int]LP5Set{
    0: {
    	SPDRevision: LP5SPDValueRevision1_0,
+		/*
+		 * For ADL (as per advisory #616599):
+		 * 7:5 (Number of system channels) = 000 (1 channel always)
+		 * 4:3 (Bus width extension) = 00 (no ECC)
+		 * 2:0 (Bus width) = 001 (x16 always)
+		 * Set to 0x01.
+		 */
+		 busWidthEncoding: 0x01,
    },
    1: {
    	SPDRevision: LP5SPDValueRevision1_1,
+		/*
+		 * For Sabrina (as per advisory b/211510456):
+		 * 7:5 (Number of system channels) = 000 (1 channel always)
+		 * 4:3 (Bus width extension) = 00 (no ECC)
+		 * 2:0 (Bus width) = 010 (x32 always)
+		 * Set to 0x02.
+		 */
+		 busWidthEncoding: 0x02,
    },
 }

@@ -306,7 +315,7 @@
    LP5SPDIndexPackageType:        {getVal: LP5EncodePackageType},
    LP5SPDIndexOptionalFeatures:   {constVal: LP5SPDValueOptionalFeatures},
    LP5SPDIndexModuleOrganization: {getVal: LP5EncodeModuleOrganization},
-	LP5SPDIndexBusWidth:           {constVal: LP5SPDValueBusWidth},
+	LP5SPDIndexBusWidth:           {getVal: LP5EncodeBusWidth},
    LP5SPDIndexTimebases:          {constVal: LP5SPDValueTimebases},
    LP5SPDIndexTCKMin:             {getVal: LP5EncodeTCKMin},
    LP5SPDIndexTCKMinFineOffset:   {getVal: LP5EncodeTCKMinFineOffset},
@@ -409,6 +418,16 @@
    return b
 }

+func LP5EncodeBusWidth(memAttribs *LP5MemAttributes) byte {
+	f, ok := LP5SetInfo[LP5CurrSet]
+
+	if ok == false {
+		return 0
+	}
+
+	return f.busWidthEncoding
+}
+
 func LP5EncodeTCKMin(memAttribs *LP5MemAttributes) byte {
    return convPsToMtbByte(memAttribs.TCKMinPs)
 }