dmaengine: at_hdmac: modify way to use interrupts

Now we use Buffer Transfer Completed interrupts. If we
want a chained buffer completed information, we setup the
ATC_IEN bit in CTRLB register in the lli.
This is done by set_desc_eol() function and used by
memcpy/slave_sg functions.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

2 files changed, 10 insertions, 5 deletions

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 3d7d705f026f..13050e646f8e 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -464,7 +464,7 @@ static irqreturn_t at_dma_interrupt(int irq, void *dev_id)
 
                 for (i = 0; i < atdma->dma_common.chancnt; i++) {
                         atchan = &atdma->chan[i];
-                        if (pending & (AT_DMA_CBTC(i) | AT_DMA_ERR(i))) {
+                        if (pending & (AT_DMA_BTC(i) | AT_DMA_ERR(i))) {
                                 if (pending & AT_DMA_ERR(i)) {
                                         /* Disable channel on AHB error */
                                         dma_writel(atdma, CHDR, atchan->mask);
@@ -549,7 +549,7 @@ atc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
         }
 
         ctrla =   ATC_DEFAULT_CTRLA;
-        ctrlb =   ATC_DEFAULT_CTRLB
+        ctrlb =   ATC_DEFAULT_CTRLB | ATC_IEN
                 | ATC_SRC_ADDR_MODE_INCR
                 | ATC_DST_ADDR_MODE_INCR
                 | ATC_FC_MEM2MEM;
diff --git a/drivers/dma/at_hdmac_regs.h b/drivers/dma/at_hdmac_regs.h
index 495457e3dc4b..8303306ea825 100644
--- a/drivers/dma/at_hdmac_regs.h
+++ b/drivers/dma/at_hdmac_regs.h
@@ -309,8 +309,8 @@ static void atc_setup_irq(struct at_dma_chan *atchan, int on)
         struct at_dma   *atdma = to_at_dma(atchan->chan_common.device);
         u32             ebci;
 
-        /* enable interrupts on buffer chain completion & error */
-        ebci =    AT_DMA_CBTC(atchan->chan_common.chan_id)
+        /* enable interrupts on buffer transfer completion & error */
+        ebci =    AT_DMA_BTC(atchan->chan_common.chan_id)
                 | AT_DMA_ERR(atchan->chan_common.chan_id);
         if (on)
                 dma_writel(atdma, EBCIER, ebci);
@@ -347,7 +347,12 @@ static inline int atc_chan_is_enabled(struct at_dma_chan *atchan)
  */
 static void set_desc_eol(struct at_desc *desc)
 {
-        desc->lli.ctrlb |= ATC_SRC_DSCR_DIS | ATC_DST_DSCR_DIS;
+        u32 ctrlb = desc->lli.ctrlb;
+
+        ctrlb &= ~ATC_IEN;
+        ctrlb |= ATC_SRC_DSCR_DIS | ATC_DST_DSCR_DIS;
+
+        desc->lli.ctrlb = ctrlb;
         desc->lli.dscr = 0;
 }