genesys: Add model option to disable fast feeding

backend/genesys/enums.h

@@ -519,6 +519,9 @@ enum class ModelFlag : unsigned
     // allow custom gamma tables
     CUSTOM_GAMMA = 1 << 13,
 
+    // disable fast feeding mode on this scanner
+    DISABLE_FAST_FEEDING = 1 << 14,
+
     // the scanner uses multi-segment sensors that must be handled during calibration
     SIS_SENSOR = 1 << 16,
 

backend/genesys/gl841.cpp

@@ -575,6 +575,9 @@ static void gl841_init_motor_regs_feed(Genesys_Device* dev, const Genesys_Sensor
     // BUG: fast table is counted in base_ydpi / 4
     feedl = feed_steps - fast_table.table.size() * 2;
     use_fast_fed = 1;
+    if (has_flag(dev->model->flags, ModelFlag::DISABLE_FAST_FEEDING)) {
+        use_fast_fed = false;
+    }
 
     reg->set8(0x3d, (feedl >> 16) & 0xf);
     reg->set8(0x3e, (feedl >> 8) & 0xff);
@@ -713,6 +716,10 @@ static void gl841_init_motor_regs_scan(Genesys_Device* dev, const Genesys_Sensor
         use_fast_fed = fast_time < slow_time;
     }
 
+    if (has_flag(dev->model->flags, ModelFlag::DISABLE_FAST_FEEDING)) {
+        use_fast_fed = false;
+    }
+
     if (use_fast_fed) {
         feedl = feed_steps - fast_table.table.size() * 2 -
                 (slow_table.table.size() >> static_cast<unsigned>(motor_profile.step_type));

backend/genesys/gl842.cpp

@@ -256,6 +256,9 @@ static void gl842_init_motor_regs_scan(Genesys_Device* dev,
     if ((scan_yres >= 300 && feed_steps > 900) || (has_flag(flags, ScanFlag::FEEDING))) {
         use_fast_fed = true;
     }
+    if (has_flag(dev->model->flags, ModelFlag::DISABLE_FAST_FEEDING)) {
+        use_fast_fed = false;
+    }
 
     reg->set24(REG_LINCNT, scan_lines);
 

backend/genesys/gl843.cpp

@@ -710,6 +710,9 @@ static void gl843_init_motor_regs_scan(Genesys_Device* dev,
     if ((scan_yres >= 300 && feed_steps > 900) || (has_flag(flags, ScanFlag::FEEDING))) {
         use_fast_fed = true;
     }
+    if (has_flag(dev->model->flags, ModelFlag::DISABLE_FAST_FEEDING)) {
+        use_fast_fed = false;
+    }
 
     reg->set24(REG_LINCNT, scan_lines);
 

backend/genesys/gl846.cpp

@@ -380,6 +380,9 @@ static void gl846_init_motor_regs_scan(Genesys_Device* dev,
     if (dev->settings.yres == 4444 && feed_steps > 100 && !has_flag(flags, ScanFlag::FEEDING)) {
         use_fast_fed = true;
     }
+    if (has_flag(dev->model->flags, ModelFlag::DISABLE_FAST_FEEDING)) {
+        use_fast_fed = false;
+    }
 
     reg->set24(REG_LINCNT, scan_lines);
 

backend/genesys/gl847.cpp

@@ -344,6 +344,9 @@ static void gl847_init_motor_regs_scan(Genesys_Device* dev,
     if (dev->settings.yres == 4444 && feed_steps > 100 && !has_flag(flags, ScanFlag::FEEDING)) {
         use_fast_fed = true;
     }
+    if (has_flag(dev->model->flags, ModelFlag::DISABLE_FAST_FEEDING)) {
+        use_fast_fed = false;
+    }
 
     reg->set24(REG_LINCNT, scan_lines);