[S] Change in coreboot[main]: util/autoport: Improve USB code

[Lean Sheng Tan (Code Review)]

Lean Sheng Tan has submitted this change. ( https://review.coreboot.org/c/coreboot/+/78828?usp=email )

Change subject: util/autoport: Improve USB code
......................................................................

util/autoport: Improve USB code

Currently autoport fills in USB current '0' if the detected setting
isn't one of the known settings. This works as 0 is a valid setting
from C point of view, but it's not supported on desktop PCs and on
mobile platform results in the lowest possible USB PHY gain. Thus
this might cause instabilities as the original firmware had stronger
USB drive currents and gain settings.

Add more known USB current fields to the map and generate a FIXME
as comment when the detected current isn't one of the known entries
instead of defaulting to 0.

Change-Id: I48f4d636ce3401ba188f5519b5ff45fccf13f080
Signed-off-by: Patrick Rudolph 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78828
Reviewed-by: Lean Sheng Tan 
Tested-by: build bot (Jenkins) 
Reviewed-by: Arthur Heymans 
---
M util/autoport/bd82x6x.go
1 file changed, 13 insertions(+), 3 deletions(-)

Approvals:
  Arthur Heymans: Looks good to me, approved
  build bot (Jenkins): Verified
  Lean Sheng Tan: Looks good to me, but someone else must approve

diff --git a/util/autoport/bd82x6x.go b/util/autoport/bd82x6x.go
index 6ce15a2..76411e7 100644
--- a/util/autoport/bd82x6x.go
+++ b/util/autoport/bd82x6x.go
@@ -309,6 +309,10 @@
    	0x2000055b: 2,
    	0x20000f51: 3,
    	0x2000094a: 4,
+		0x2000035f: 5,
+		0x20000f53: 6,
+		0x20000357: 7,
+		0x20000353: 8,
    }

for port := uint(0); port < 14; port++ {
@@ -327,10 +331,16 @@
    			}
    		}
    	}
-		fmt.Fprintf(sb, "\t{ %d, %d, %d },\n",
+		current, ok := currentMap[inteltool.RCBA[uint16(0x3500+4*port)]]
+		comment := ""
+		if !ok {
+			comment = fmt.Sprintf("// FIXME: Unknown current: RCBA(0x%x)=0x%x", 0x3500+4*port, uint16(0x3500+4*port))
+		}
+		fmt.Fprintf(sb, "\t{ %d, %d, %d }, %s\n",
    		((inteltool.RCBA[0x359c]>>port)&1)^1,
-			currentMap[inteltool.RCBA[uint16(0x3500+4*port)]],
-			OCPin)
+			current,
+			OCPin,
+			comment)
    }
    sb.WriteString("};\n")