dmaengine: sun6i: Remove switch statement from buswidth convertion routine

Since the conversion routine is quite trivial, we don't need this switch, and
we can just use a simple calculation.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 3 insertions, 12 deletions

diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index c771d90b8ded..609c5d8cb947 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c
@@ -248,20 +248,11 @@ static inline int convert_burst(u32 maxburst, u8 *burst)
 
 static inline int convert_buswidth(enum dma_slave_buswidth addr_width, u8 *width)
 {
-        switch (addr_width) {
-        case DMA_SLAVE_BUSWIDTH_1_BYTE:
-                *width = 0;
-                break;
-        case DMA_SLAVE_BUSWIDTH_2_BYTES:
-                *width = 1;
-                break;
-        case DMA_SLAVE_BUSWIDTH_4_BYTES:
-                *width = 2;
-                break;
-        default:
+        if ((addr_width < DMA_SLAVE_BUSWIDTH_1_BYTE) ||
+            (addr_width > DMA_SLAVE_BUSWIDTH_4_BYTES))
                 return -EINVAL;
-        }
 
+        *width = addr_width >> 1;
         return 0;
 }