dmaengine: mmp_tdma: add DMA_PREP_INTERRUPT flag support

add DMA_PREP_INTERRUPT flag to support no_period_wakeup, in which
user space app doesn't want audio interrupt to wake up audio threads.
Signed-off-by: Qiao Zhou <zhouqiao@marvell.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/mmp_tdma.c

@@ -148,10 +148,16 @@ static void mmp_tdma_chan_set_desc(struct mmp_tdma_chan *tdmac, dma_addr_t phys)
 					tdmac->reg_base + TDCR);
 }
 
-static void mmp_tdma_enable_chan(struct mmp_tdma_chan *tdmac)
+static void mmp_tdma_enable_irq(struct mmp_tdma_chan *tdmac, bool enable)
 {
-	/* enable irq */
+	if (enable)
 		writel(TDIMR_COMP, tdmac->reg_base + TDIMR);
+	else
+		writel(0, tdmac->reg_base + TDIMR);
+}
+
+static void mmp_tdma_enable_chan(struct mmp_tdma_chan *tdmac)
+{
 	/* enable dma chan */
 	writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN,
 					tdmac->reg_base + TDCR);
@@ -163,9 +169,6 @@ static void mmp_tdma_disable_chan(struct mmp_tdma_chan *tdmac)
 	writel(readl(tdmac->reg_base + TDCR) & ~TDCR_CHANEN,
 					tdmac->reg_base + TDCR);
 
-	/* disable irq */
-	writel(0, tdmac->reg_base + TDIMR);
-
 	tdmac->status = DMA_COMPLETE;
 }
 
@@ -434,6 +437,10 @@ static struct dma_async_tx_descriptor *mmp_tdma_prep_dma_cyclic(
 		i++;
 	}
 
+	/* enable interrupt */
+	if (flags & DMA_PREP_INTERRUPT)
+		mmp_tdma_enable_irq(tdmac, true);
+
 	tdmac->buf_len = buf_len;
 	tdmac->period_len = period_len;
 	tdmac->pos = 0;
@@ -455,6 +462,8 @@ static int mmp_tdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
 	switch (cmd) {
 	case DMA_TERMINATE_ALL:
 		mmp_tdma_disable_chan(tdmac);
+		/* disable interrupt */
+		mmp_tdma_enable_irq(tdmac, false);
 		break;
 	case DMA_PAUSE:
 		mmp_tdma_pause_chan(tdmac);