diff -r 9652f85e688a linux/drivers/media/dvb/mantis/mantis_dma.c
--- a/linux/drivers/media/dvb/mantis/mantis_dma.c	Thu May 27 02:02:09 2010 -0300
+++ b/linux/drivers/media/dvb/mantis/mantis_dma.c	Sat Jun 19 13:04:49 2010 +0300
@@ -46,11 +46,15 @@
 #define RISC_FLUSH()		(mantis->risc_pos = 0)
 #define RISC_INSTR(opcode)	(mantis->risc_cpu[mantis->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)
+/* (16 * 188) = 3008. (16 * 204) = 3264. x % 64 == 0, x <= 4095 */
+#define RISC_DMA_TR_UNIT(m)     (((m->hwconfig->ts_size == MANTIS_TS_204)? 204:188) * 16)
+#define DMA_TRANSFERS_PER_BLOCK (5)
+#define MANTIS_BLOCK_BYTES(m)   (RISC_DMA_TR_UNIT(m) * DMA_TRANSFERS_PER_BLOCK)
+#define MANTIS_BLOCK_COUNT	(4)
 #define MANTIS_RISC_SIZE	PAGE_SIZE
 
+#define MANTIS_DMA_BUFSZ(m)     (m->line_bytes * m->line_count)
+
 int mantis_dma_exit(struct mantis_pci *mantis)
 {
 	if (mantis->buf_cpu) {
@@ -58,9 +62,9 @@
 			"DMA=0x%lx cpu=0x%p size=%d",
 			(unsigned long) mantis->buf_dma,
 			 mantis->buf_cpu,
-			 MANTIS_BUF_SIZE);
+			 MANTIS_DMA_BUFSZ(mantis));
 
-		pci_free_consistent(mantis->pdev, MANTIS_BUF_SIZE,
+		pci_free_consistent(mantis->pdev, MANTIS_DMA_BUFSZ(mantis),
 				    mantis->buf_cpu, mantis->buf_dma);
 
 		mantis->buf_cpu = NULL;
@@ -86,7 +90,7 @@
 {
 	if (!mantis->buf_cpu) {
 		mantis->buf_cpu = pci_alloc_consistent(mantis->pdev,
-						       MANTIS_BUF_SIZE,
+						       MANTIS_DMA_BUFSZ(mantis),
 						       &mantis->buf_dma);
 		if (!mantis->buf_cpu) {
 			dprintk(MANTIS_ERROR, 1,
@@ -97,7 +101,8 @@
 		dprintk(MANTIS_ERROR, 1,
 			"DMA=0x%lx cpu=0x%p size=%d",
 			(unsigned long) mantis->buf_dma,
-			mantis->buf_cpu, MANTIS_BUF_SIZE);
+			mantis->buf_cpu,
+			MANTIS_DMA_BUFSZ(mantis));
 	}
 	if (!mantis->risc_cpu) {
 		mantis->risc_cpu = pci_alloc_consistent(mantis->pdev,
@@ -126,18 +131,13 @@
 
 static inline int mantis_calc_lines(struct mantis_pci *mantis)
 {
-	mantis->line_bytes = MANTIS_BLOCK_BYTES;
+	mantis->line_bytes = MANTIS_BLOCK_BYTES(mantis);
 	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]",
+		RISC_DMA_TR_UNIT(mantis), mantis->line_bytes, mantis->line_count);
 
-	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) {
+	if (DMA_TRANSFERS_PER_BLOCK * mantis->line_count > 255) {
 		dprintk(MANTIS_ERROR, 1, "Buffer size error");
 		return -EINVAL;
 	}
@@ -150,6 +150,14 @@
 	int err = 0;
 
 	dprintk(MANTIS_DEBUG, 1, "Mantis DMA init");
+
+	err = mantis_calc_lines(mantis);
+	if (err < 0) {
+		dprintk(MANTIS_ERROR, 1, "Mantis calc lines failed");
+
+		goto err;
+	}
+
 	if (mantis_alloc_buffers(mantis) < 0) {
 		dprintk(MANTIS_ERROR, 1, "Error allocating DMA buffer");
 
@@ -158,12 +166,6 @@
 
 		goto err;
 	}
-	err = mantis_calc_lines(mantis);
-	if (err < 0) {
-		dprintk(MANTIS_ERROR, 1, "Mantis calc lines failed");
-
-		goto err;
-	}
 
 	return 0;
 err:
@@ -175,7 +177,9 @@
 {
 	u32 buf_pos = 0;
 	u32 line;
+	u32 step_bytes;
 
+	step_bytes = RISC_DMA_TR_UNIT(mantis);
 	dprintk(MANTIS_DEBUG, 1, "Mantis create RISC program");
 	RISC_FLUSH();
 
@@ -183,19 +187,18 @@
 		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);
+		int risc_step;
+
+		for (risc_step = 0; risc_step < DMA_TRANSFERS_PER_BLOCK; risc_step++) {
+		  u32 en_irq = (risc_step == 1);
+			dprintk(MANTIS_DEBUG, 1, "RISC PROG line=[%d] risc_step=[%d] en_irq=[%d]", line, risc_step, en_irq);
+			/* Last risc_step: eject IRQ about block completion. */
+			RISC_INSTR(RISC_WRITE |
+				   (en_irq ? (RISC_IRQ | RISC_STATUS(line)) : 0) |
+				   step_bytes);
+			RISC_INSTR(mantis->buf_dma + buf_pos);
+			buf_pos += step_bytes;
 		}
-		RISC_INSTR(mantis->buf_dma + buf_pos);
-		buf_pos += mantis->line_bytes;
 	}
 	RISC_INSTR(RISC_JUMP);
 	RISC_INSTR(mantis->risc_dma);
@@ -205,23 +208,25 @@
 {
 	dprintk(MANTIS_DEBUG, 1, "Mantis Start DMA engine");
 
+	memset(mantis->buf_cpu, 0, MANTIS_DMA_BUFSZ(mantis));
+	mantis->last_block = mantis->finished_block = 0;
 	mantis_risc_program(mantis);
 	mmwrite(mantis->risc_dma, MANTIS_RISC_START);
 	mmwrite(mmread(MANTIS_GPIF_ADDR) | MANTIS_GPIF_HIFRDWRN, MANTIS_GPIF_ADDR);
 
 	mmwrite(0, MANTIS_DMA_CTL);
-	mantis->last_block = mantis->finished_block = 0;
 
 	mmwrite(mmread(MANTIS_INT_MASK) | MANTIS_INT_RISCI, MANTIS_INT_MASK);
 
 	mmwrite(MANTIS_FIFO_EN | MANTIS_DCAP_EN
 			       | MANTIS_RISC_EN, MANTIS_DMA_CTL);
-
+	//	tasklet_enable(&mantis->tasklet);
 }
 
 void mantis_dma_stop(struct mantis_pci *mantis)
 {
 	u32 stat = 0, mask = 0;
+	//tasklet_disable(&mantis->tasklet);
 
 	stat = mmread(MANTIS_INT_STAT);
 	mask = mmread(MANTIS_INT_MASK);
@@ -246,11 +251,12 @@
 	struct mantis_hwconfig *config = mantis->hwconfig;
 
 	while (mantis->last_block != mantis->finished_block) {
+
 		dprintk(MANTIS_DEBUG, 1, "last block=[%d] finished block=[%d]",
 			mantis->last_block, mantis->finished_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);
-		mantis->last_block = (mantis->last_block + 1) % MANTIS_BLOCK_COUNT;
+		(&mantis->demux, &mantis->buf_cpu[mantis->last_block * mantis->line_bytes], mantis->line_bytes);
+		mantis->last_block = (mantis->last_block + 1) % mantis->line_count;
 	}
 }