From 8e34275c746c1f4567543883ad6e2e3d8a9b1b92 Mon Sep 17 00:00:00 2001
From: tmk <hasu@tmk-kbd.com>
Date: Fri, 5 Feb 2021 21:50:57 +0900
Subject: [PATCH] ibmpc: Fix start bit error for Zenith Z-150 AT #661

ibmpc_host_send() can miss 1st clock from Zenith Z-150 AT sometimes.
https://github.com/tmk/tmk_keyboard/issues/661#issuecomment-772298392
---
 tmk_core/protocol/ibmpc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tmk_core/protocol/ibmpc.c b/tmk_core/protocol/ibmpc.c
index 0f093f800a..9d5791e914 100644
--- a/tmk_core/protocol/ibmpc.c
+++ b/tmk_core/protocol/ibmpc.c
@@ -111,7 +111,7 @@ int16_t ibmpc_host_send(uint8_t data)
     data_lo();
     wait_us(100);
     clock_hi();     // [5]p.54 [clock low]>100us [5]p.50
-    WAIT(clock_lo, 10000, 1);   // [5]p.53, -10ms [5]p.50
+    WAIT(clock_lo, 60000, 1);   // [5]p.53, -10ms [5]p.50
 
     /* Data bit[2-9] */
     for (uint8_t i = 0; i < 8; i++) {
@@ -162,6 +162,8 @@ int16_t ibmpc_host_send(uint8_t data)
     // https://github.com/tmk/tmk_keyboard/wiki/IBM-PC-AT-Keyboard-Protocol#zenith-z-150-beige
     if (!ibmpc_protocol && ibmpc_error == 7) { goto RECV; }
 
+    inhibit();
+    wait_ms(2);
     idle();
     IBMPC_INT_ON();
     return -1;