From 30e8aac43f1a7afbc3ac8a4b0b13c80d1a7243d2 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Thu, 5 Sep 2013 01:09:17 +0300
Subject: [PATCH 1/1] cd: tweak the poll code further

---
 pico/cd/mcd.c    |  5 ++++-
 pico/cd/memory.c | 16 ++++++----------
 2 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/pico/cd/mcd.c b/pico/cd/mcd.c
index 0157bb5..0824ec0 100644
--- a/pico/cd/mcd.c
+++ b/pico/cd/mcd.c
@@ -82,6 +82,9 @@ static __inline void SekRunS68k(unsigned int to)
   if ((cyc_do = SekCycleAimS68k - SekCycleCntS68k) <= 0)
     return;
 
+  if (SekShouldInterrupt())
+    Pico_mcd->m.s68k_poll_a = 0;
+
   SekCycleCntS68k += cyc_do;
 #if defined(EMU_C68K)
   PicoCpuCS68k.cycles = cyc_do;
@@ -263,7 +266,7 @@ static void SekSyncM68k(void);
 static inline void pcd_run_cpus_normal(int m68k_cycles)
 {
   SekCycleAim += m68k_cycles;
-  if (SekShouldInterrupt())
+  if (SekShouldInterrupt() || Pico_mcd->m.m68k_poll_cnt < 12)
     Pico_mcd->m.m68k_poll_cnt = 0;
   else if (Pico_mcd->m.m68k_poll_cnt >= 16) {
     int s68k_left = pcd_sync_s68k(SekCycleAim, 1);
diff --git a/pico/cd/memory.c b/pico/cd/memory.c
index 4b4c18f..2d8cc76 100644
--- a/pico/cd/memory.c
+++ b/pico/cd/memory.c
@@ -70,7 +70,7 @@ static void remap_word_ram(u32 r3);
 
 // poller detection
 #define POLL_LIMIT 16
-#define POLL_CYCLES 124
+#define POLL_CYCLES 64
 
 void m68k_comm_check(u32 a)
 {
@@ -143,9 +143,6 @@ void m68k_reg_write8(u32 a, u32 d)
   u32 dold;
   a &= 0x3f;
 
-  Pico_mcd->m.m68k_poll_a =
-  Pico_mcd->m.m68k_poll_cnt = 0;
-
   switch (a) {
     case 0:
       d &= 1;
@@ -230,18 +227,17 @@ write_comm:
   if (d == Pico_mcd->s68k_regs[a])
     return;
 
-  Pico_mcd->s68k_regs[a] = d;
   pcd_sync_s68k(SekCyclesDone(), 0);
-  if (Pico_mcd->m.s68k_poll_a == a && Pico_mcd->m.s68k_poll_cnt > POLL_LIMIT) {
+  Pico_mcd->s68k_regs[a] = d;
+  if (Pico_mcd->m.s68k_poll_a == (a & ~1)
+      && Pico_mcd->m.s68k_poll_cnt > POLL_LIMIT)
+  {
     SekSetStopS68k(0);
     Pico_mcd->m.s68k_poll_a = 0;
     elprintf(EL_CDPOLL, "s68k poll release, a=%02x", a);
   }
 }
 
-#ifndef _ASM_CD_MEMORY_C
-static
-#endif
 u32 s68k_poll_detect(u32 a, u32 d)
 {
 #ifdef USE_POLL_DETECT
@@ -807,7 +803,7 @@ static u32 PicoReadS68k8_pr(u32 a)
     a &= 0x1ff;
     if (a >= 0x0e && a < 0x30) {
       d = Pico_mcd->s68k_regs[a];
-      s68k_poll_detect(a, d);
+      s68k_poll_detect(a & ~1, d);
       goto regs_done;
     }
     else if (a >= 0x58 && a < 0x68)
-- 
2.39.2