From b42437c458b71a8519860a2592a15370c6a1b34f Mon Sep 17 00:00:00 2001
From: joevt <joevt@shaw.ca>
Date: Wed, 24 Jan 2024 00:55:40 -0800
Subject: [PATCH] control: Mask unmodifiable bits.

---
 devices/video/control.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/devices/video/control.cpp b/devices/video/control.cpp
index 5bc4623..c9b3db0 100644
--- a/devices/video/control.cpp
+++ b/devices/video/control.cpp
@@ -337,6 +337,7 @@ void ControlVideo::write(uint32_t rgn_start, uint32_t offset, uint32_t value, in
                 LOG_F(WARNING, "%s: CNTTST set to 0x%X", this->name.c_str(), value);
             break;
         case ControlRegs::SWATCH_CTRL:
+            value &= 0x7FF;
             if ((this->swatch_ctrl ^ value) & DISABLE_TIMING) {
                 this->swatch_ctrl = value;
                 this->strobe_counter = 0;
@@ -375,7 +376,7 @@ void ControlVideo::write(uint32_t rgn_start, uint32_t offset, uint32_t value, in
                     this->blank_display();
                 }
             }
-            this->enables = value;
+            this->enables = value & 0xFFF;
             if (this->enables & FB_ENDIAN_LITTLE)
                 ABORT_F("%s: little-endian framebuffer is not implemented yet",
                         this->name.c_str());