dmaengine: stm32-dma: fix stm32_dma_get_max_width

buf_addr parameter of stm32_dma_set_xfer_param function is a dma_addr_t.
We only need to check the remainder of buf_addr/max_width, so, no need to
use do_div and extra u64 addr. Use '%' instead.

Fixes: e0ebdbdcb42a ("dmaengine: stm32-dma: take address into account when computing max width")
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Link: https://lore.kernel.org/r/20211011094259.315023-3-amelie.delaunay@foss.st.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index a5ccf3f..6e4ef44 100644 (file)
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -270,7 +270,6 @@ static enum dma_slave_buswidth stm32_dma_get_max_width(u32 buf_len,
                                                       u32 threshold)
 {
        enum dma_slave_buswidth max_width;
-       u64 addr = buf_addr;
 
        if (threshold == STM32_DMA_FIFO_THRESHOLD_FULL)
                max_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
@@ -281,7 +280,7 @@ static enum dma_slave_buswidth stm32_dma_get_max_width(u32 buf_len,
               max_width > DMA_SLAVE_BUSWIDTH_1_BYTE)
                max_width = max_width >> 1;
 
-       if (do_div(addr, max_width))
+       if (buf_addr % max_width)
                max_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
 
        return max_width;