From f09c97336ed5b917c1018d295cae5b1c86c91cda Mon Sep 17 00:00:00 2001
From: ekeeke <ekeeke31@gmail.com>
Date: Wed, 21 Feb 2024 20:25:04 +0100
Subject: [PATCH] [Core/CD] added clear of CDC decoder interrupt pending flag
 when decoding is disabled (verified on real hardware, cf. Krikzz's
 mcd-verificator)

---
 core/cd_hw/cdc.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/core/cd_hw/cdc.c b/core/cd_hw/cdc.c
index fb30e53..20a9dcc 100644
--- a/core/cd_hw/cdc.c
+++ b/core/cd_hw/cdc.c
@@ -680,6 +680,16 @@ void cdc_reg_w(unsigned char data)
       /* set CRCOK bit only if decoding is enabled */
       cdc.stat[0] = data & BIT_DECEN;
 
+      /* decoding disabled ? */
+      if (!(data & BIT_DECEN))
+      {
+        /* clear pending decoder interrupt */
+        cdc.ifstat |= BIT_DECI;
+
+        /* update CDC IRQ state */
+        cdc.irq &= ~BIT_DECI;
+      }
+
       /* update STAT2 register */
       if (data & BIT_AUTORQ)
       {