dmaengine/dw_dmac: Add 64 bit access width support for slave xfers on mem side

64 bit transfers are possible on both sides in slave transfers (memory as well
as peripherals). This patch adds support for it memory side 64 bit transfers.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 5d7b199208d9..9f4310f013f5 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -749,8 +749,14 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
 
                         mem = sg_phys(sg);
                         len = sg_dma_len(sg);
-                        mem_width = 2;
-                        if (unlikely(mem & 3 || len & 3))
+
+                        if (!((mem | len) & 7))
+                                mem_width = 3;
+                        else if (!((mem | len) & 3))
+                                mem_width = 2;
+                        else if (!((mem | len) & 1))
+                                mem_width = 1;
+                        else
                                 mem_width = 0;
 
 slave_sg_todev_fill_desc:
@@ -807,8 +813,14 @@ slave_sg_todev_fill_desc:
 
                         mem = sg_phys(sg);
                         len = sg_dma_len(sg);
-                        mem_width = 2;
-                        if (unlikely(mem & 3 || len & 3))
+
+                        if (!((mem | len) & 7))
+                                mem_width = 3;
+                        else if (!((mem | len) & 3))
+                                mem_width = 2;
+                        else if (!((mem | len) & 1))
+                                mem_width = 1;
+                        else
                                 mem_width = 0;
 
 slave_sg_fromdev_fill_desc: