From 3e5f81b775fb2e0b931a436b0fd8435979ed1d13 Mon Sep 17 00:00:00 2001
From: Jeremy Soller <jeremy@system76.com>
Date: Tue, 12 Nov 2019 10:59:01 -0700
Subject: [PATCH] Adjust SMBUS timing

---
 src/board/system76/galp3-c/smbus.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/src/board/system76/galp3-c/smbus.c b/src/board/system76/galp3-c/smbus.c
index f7e4530..f90a3b0 100644
--- a/src/board/system76/galp3-c/smbus.c
+++ b/src/board/system76/galp3-c/smbus.c
@@ -1,15 +1,21 @@
 #include <board/smbus.h>
 
 void smbus_init(void) {
-    SMB4P7USL = 0x2F;
-    SMB4P0USL = 0x5A;
-    SMB300NS = 0x03;
-    SMB250NS = 0x30;
-    SMB25MS = 0x19;
-    SMB45P3USL = 0x5C;
+    // 9.2 MHz * 4.7 us = 43.24
+    SMB4P7USL = 43;
+    // 9.2 MHz * 4.0 us = 36.8
+    SMB4P0USL = 37;
+    // 9.2 MHz * 300 ns = 2.76
+    SMB300NS = 3;
+    // 9.2 MHz * 250 ns = 2.3
+    SMB250NS = 2;
+    // 1.024 KHz * 25 ms = 25.6
+    SMB25MS = 26;
+    // 9.2 MHz * 45.3 us = 416.76 (0x01A1)
+    SMB45P3USL = 0xA1;
     SMB45P3USH = 0x01;
 
-    // Clock to 50 KHz
+    // Clock set to 50 Hz
     SCLKTSA = 1;
 
     // Enable host interface