diff --git a/drivers/media/dvb/mantis/hopper_cards.c b/drivers/media/dvb/mantis/hopper_cards.c
index 09e9fc7..3b7e376 100644
--- a/drivers/media/dvb/mantis/hopper_cards.c
+++ b/drivers/media/dvb/mantis/hopper_cards.c
@@ -126,7 +126,7 @@ static irqreturn_t hopper_irq_handler(int irq, void *dev_id)
 	}
 	if (stat & MANTIS_INT_RISCI) {
 		dprintk(MANTIS_DEBUG, 0, "<%s>", label[8]);
-		mantis->finished_block = (stat & MANTIS_INT_RISCSTAT) >> 28;
+		mantis->busy_block = (stat & MANTIS_INT_RISCSTAT) >> 28;
 		tasklet_schedule(&mantis->tasklet);
 	}
 	if (stat & MANTIS_INT_I2CDONE) {
diff --git a/drivers/media/dvb/mantis/mantis_cards.c b/drivers/media/dvb/mantis/mantis_cards.c
index cf4b39f..8f048d5 100644
--- a/drivers/media/dvb/mantis/mantis_cards.c
+++ b/drivers/media/dvb/mantis/mantis_cards.c
@@ -134,7 +134,7 @@ static irqreturn_t mantis_irq_handler(int irq, void *dev_id)
 	}
 	if (stat & MANTIS_INT_RISCI) {
 		dprintk(MANTIS_DEBUG, 0, "<%s>", label[8]);
-		mantis->finished_block = (stat & MANTIS_INT_RISCSTAT) >> 28;
+		mantis->busy_block = (stat & MANTIS_INT_RISCSTAT) >> 28;
 		tasklet_schedule(&mantis->tasklet);
 	}
 	if (stat & MANTIS_INT_I2CDONE) {
diff --git a/drivers/media/dvb/mantis/mantis_common.h b/drivers/media/dvb/mantis/mantis_common.h
index d0b645a..23b23b7 100644
--- a/drivers/media/dvb/mantis/mantis_common.h
+++ b/drivers/media/dvb/mantis/mantis_common.h
@@ -122,11 +122,8 @@ struct mantis_pci {
 	unsigned int		num;
 
 	/*	RISC Core		*/
-	u32			finished_block;
+	u32			busy_block;
 	u32			last_block;
-	u32			line_bytes;
-	u32			line_count;
-	u32			risc_pos;
 	u8			*buf_cpu;
 	dma_addr_t		buf_dma;
 	u32			*risc_cpu;
diff --git a/drivers/media/dvb/mantis/mantis_dma.c b/drivers/media/dvb/mantis/mantis_dma.c
index 46202a4..c61ca7d 100644
--- a/drivers/media/dvb/mantis/mantis_dma.c
+++ b/drivers/media/dvb/mantis/mantis_dma.c
@@ -43,13 +43,17 @@
 #define RISC_IRQ		(0x01 << 24)
 
 #define RISC_STATUS(status)	((((~status) & 0x0f) << 20) | ((status & 0x0f) << 16))
-#define RISC_FLUSH()		(mantis->risc_pos = 0)
-#define RISC_INSTR(opcode)	(mantis->risc_cpu[mantis->risc_pos++] = cpu_to_le32(opcode))
+#define RISC_FLUSH(risc_pos)		(risc_pos = 0)
+#define RISC_INSTR(risc_pos, opcode)	(mantis->risc_cpu[risc_pos++] = cpu_to_le32(opcode))
 
 #define MANTIS_BUF_SIZE		(64 * 1024)
-#define MANTIS_BLOCK_BYTES	(MANTIS_BUF_SIZE >> 4)
-#define MANTIS_BLOCK_COUNT	(1 << 4)
-#define MANTIS_RISC_SIZE	PAGE_SIZE
+#define MANTIS_BLOCK_BYTES      (MANTIS_BUF_SIZE / 4)
+#define MANTIS_DMA_TR_BYTES     (2 * 1024) /* upper limit: 4095 bytes. */
+#define MANTIS_BLOCK_COUNT	(MANTIS_BUF_SIZE / MANTIS_BLOCK_BYTES)
+
+#define MANTIS_DMA_TR_UNITS     (MANTIS_BLOCK_BYTES / MANTIS_DMA_TR_BYTES)
+/* MANTIS_BUF_SIZE / MANTIS_DMA_TR_UNITS must not exceed MANTIS_RISC_SIZE (4k RISC cmd buffer) */
+#define MANTIS_RISC_SIZE	PAGE_SIZE /* RISC program must fit here. */
 
 int mantis_dma_exit(struct mantis_pci *mantis)
 {
@@ -124,27 +128,6 @@ err:
 	return -ENOMEM;
 }
 
-static inline int mantis_calc_lines(struct mantis_pci *mantis)
-{
-	mantis->line_bytes = MANTIS_BLOCK_BYTES;
-	mantis->line_count = MANTIS_BLOCK_COUNT;
-
-	while (mantis->line_bytes > 4095) {
-		mantis->line_bytes >>= 1;
-		mantis->line_count <<= 1;
-	}
-
-	dprintk(MANTIS_DEBUG, 1, "Mantis RISC block bytes=[%d], line bytes=[%d], line count=[%d]",
-		MANTIS_BLOCK_BYTES, mantis->line_bytes, mantis->line_count);
-
-	if (mantis->line_count > 255) {
-		dprintk(MANTIS_ERROR, 1, "Buffer size error");
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
 int mantis_dma_init(struct mantis_pci *mantis)
 {
 	int err = 0;
@@ -158,12 +141,6 @@ int mantis_dma_init(struct mantis_pci *mantis)
 
 		goto err;
 	}
-	err = mantis_calc_lines(mantis);
-	if (err < 0) {
-		dprintk(MANTIS_ERROR, 1, "Mantis calc lines failed");
-
-		goto err;
-	}
 
 	return 0;
 err:
@@ -174,31 +151,32 @@ EXPORT_SYMBOL_GPL(mantis_dma_init);
 static inline void mantis_risc_program(struct mantis_pci *mantis)
 {
 	u32 buf_pos = 0;
-	u32 line;
+	u32 line, step;
+	u32 risc_pos;
 
 	dprintk(MANTIS_DEBUG, 1, "Mantis create RISC program");
-	RISC_FLUSH();
-
-	dprintk(MANTIS_DEBUG, 1, "risc len lines %u, bytes per line %u",
-		mantis->line_count, mantis->line_bytes);
-
-	for (line = 0; line < mantis->line_count; line++) {
-		dprintk(MANTIS_DEBUG, 1, "RISC PROG line=[%d]", line);
-		if (!(buf_pos % MANTIS_BLOCK_BYTES)) {
-			RISC_INSTR(RISC_WRITE	|
-				   RISC_IRQ	|
-				   RISC_STATUS(((buf_pos / MANTIS_BLOCK_BYTES) +
-				   (MANTIS_BLOCK_COUNT - 1)) %
-				    MANTIS_BLOCK_COUNT) |
-				    mantis->line_bytes);
-		} else {
-			RISC_INSTR(RISC_WRITE	| mantis->line_bytes);
-		}
-		RISC_INSTR(mantis->buf_dma + buf_pos);
-		buf_pos += mantis->line_bytes;
+	RISC_FLUSH(risc_pos);
+
+	dprintk(MANTIS_DEBUG, 1, "risc len lines %u, bytes per line %u, bytes per DMA tr %u",
+		MANTIS_BLOCK_COUNT, MANTIS_BLOCK_BYTES, MANTIS_DMA_TR_BYTES);
+
+	for (line = 0; line < MANTIS_BLOCK_COUNT; line++) {
+		for (step = 0; step < MANTIS_DMA_TR_UNITS; step++) {
+			dprintk(MANTIS_DEBUG, 1, "RISC PROG line=[%d], step=[%d]", line, step);
+			if (step == 0) {
+				RISC_INSTR(risc_pos, RISC_WRITE	|
+					   RISC_IRQ	|
+					   RISC_STATUS(line) |
+					   MANTIS_DMA_TR_BYTES);
+			} else {
+				RISC_INSTR(risc_pos, RISC_WRITE | MANTIS_DMA_TR_BYTES);
+			}
+			RISC_INSTR(risc_pos, mantis->buf_dma + buf_pos);
+			buf_pos += MANTIS_DMA_TR_BYTES;
+		  }
 	}
-	RISC_INSTR(RISC_JUMP);
-	RISC_INSTR(mantis->risc_dma);
+	RISC_INSTR(risc_pos, RISC_JUMP);
+	RISC_INSTR(risc_pos, mantis->risc_dma);
 }
 
 void mantis_dma_start(struct mantis_pci *mantis)
@@ -210,7 +188,7 @@ void mantis_dma_start(struct mantis_pci *mantis)
 	mmwrite(mmread(MANTIS_GPIF_ADDR) | MANTIS_GPIF_HIFRDWRN, MANTIS_GPIF_ADDR);
 
 	mmwrite(0, MANTIS_DMA_CTL);
-	mantis->last_block = mantis->finished_block = 0;
+	mantis->last_block = mantis->busy_block = 0;
 
 	mmwrite(mmread(MANTIS_INT_MASK) | MANTIS_INT_RISCI, MANTIS_INT_MASK);
 
@@ -245,9 +223,9 @@ void mantis_dma_xfer(unsigned long data)
 	struct mantis_pci *mantis = (struct mantis_pci *) data;
 	struct mantis_hwconfig *config = mantis->hwconfig;
 
-	while (mantis->last_block != mantis->finished_block) {
+	while (mantis->last_block != mantis->busy_block) {
 		dprintk(MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]",
-			mantis->last_block, mantis->finished_block);
+			mantis->last_block, mantis->busy_block);
 
 		(config->ts_size ? dvb_dmx_swfilter_204 : dvb_dmx_swfilter)
 		(&mantis->demux, &mantis->buf_cpu[mantis->last_block * MANTIS_BLOCK_BYTES], MANTIS_BLOCK_BYTES);
