[PATCH 5/7] dmaengine: sprd: Support DMA link-list cyclic callback

[Baolin Wang]

From: Eric Long <eric.l...@spreadtrum.com>

The Spreadtrum DMA link-list mode is always one cyclic transfer,
so we should clear the SPRD_DMA_LLIST_END flag for the link-list
configuration. Moreover add cyclic callback support for the cyclic
transfer.

Signed-off-by: Eric Long <eric.l...@spreadtrum.com>
Signed-off-by: Baolin Wang <baolin.w...@linaro.org>
---
 drivers/dma/sprd-dma.c |   25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index 1b39661..cefe42f 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -463,7 +463,7 @@ static irqreturn_t dma_irq_handle(int irq, void *dev_id)
        struct sprd_dma_desc *sdesc;
        enum sprd_dma_req_mode req_type;
        enum sprd_dma_int_type int_type;
-       bool trans_done = false;
+       bool trans_done = false, cyclic = false;
        u32 i;
 
        while (irq_status) {
@@ -478,13 +478,19 @@ static irqreturn_t dma_irq_handle(int irq, void *dev_id)
 
                sdesc = schan->cur_desc;
 
-               /* Check if the dma request descriptor is done. */
-               trans_done = sprd_dma_check_trans_done(sdesc, int_type,
-                                                      req_type);
-               if (trans_done == true) {
-                       vchan_cookie_complete(&sdesc->vd);
-                       schan->cur_desc = NULL;
-                       sprd_dma_start(schan);
+               /* cyclic mode schedule callback */
+               cyclic = schan->linklist.phy_addr ? true : false;
+               if (cyclic == true) {
+                       vchan_cyclic_callback(&sdesc->vd);
+               } else {
+                       /* Check if the dma request descriptor is done. */
+                       trans_done = sprd_dma_check_trans_done(sdesc, int_type,
+                                                              req_type);
+                       if (trans_done == true) {
+                               vchan_cookie_complete(&sdesc->vd);
+                               schan->cur_desc = NULL;
+                               sprd_dma_start(schan);
+                       }
                }
                spin_unlock(&schan->vc.lock);
        }
@@ -692,9 +698,6 @@ static int sprd_dma_fill_desc(struct dma_chan *chan,
 
        /* link-list configuration */
        if (schan->linklist.phy_addr) {
-               if (sg_index == sglen - 1)
-                       hw->frg_len |= SPRD_DMA_LLIST_END;
-
                hw->cfg |= SPRD_DMA_LINKLIST_EN;
 
                /* link-list index */
-- 
1.7.9.5