dmaengine: ste_dma40: limit burst size to 16

The client is not aware of the maximum burst size in the dma driver.  If
the size exceeds 16 set max to 16.

Signed-off-by: Per Forlin <per.forlin@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index f5724d95ed48..2d0c63dcd84c 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -2578,6 +2578,14 @@ static int d40_set_runtime_config(struct dma_chan *chan,
                 return -EINVAL;
         }
 
+        if (src_maxburst > 16) {
+                src_maxburst = 16;
+                dst_maxburst = src_maxburst * src_addr_width / dst_addr_width;
+        } else if (dst_maxburst > 16) {
+                dst_maxburst = 16;
+                src_maxburst = dst_maxburst * dst_addr_width / src_addr_width;
+        }
+
         ret = dma40_config_to_halfchannel(d40c, &cfg->src_info,
                                           src_addr_width,
                                           src_maxburst);