[PATCH v5 6/9] iio: buffer-dmaengine: Use dma_slave_caps bus width accessors

[Nuno Sá]

Query the minimum supported source and destination bus widths through
the new dma_bus_width_min() helper rather than decoding the raw legacy
u32 width masks. This keeps the buffer working
with DMA controllers that advertise bus widths via the new bitmap
representation.

Reviewed-by: Frank Li <Frank.Li at nxp.com>
Acked-by: Jonathan Cameron <jonathan.cameron at oss.qualcomm.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko at intel.com>
Signed-off-by: Nuno Sá <nuno.sa at analog.com>
---
 drivers/iio/buffer/industrialio-buffer-dmaengine.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/iio/buffer/industrialio-buffer-dmaengine.c b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
index ecc02a427b92..df78c1f811e0 100644
--- a/drivers/iio/buffer/industrialio-buffer-dmaengine.c
+++ b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
@@ -265,14 +265,13 @@ static struct iio_buffer *iio_dmaengine_buffer_alloc(struct dma_chan *chan)
 		return ERR_PTR(-ENOMEM);
 
 	/* Needs to be aligned to the maximum of the minimums */
-	if (caps.src_addr_widths)
-		src_width = __ffs(caps.src_addr_widths);
-	else
-		src_width = 1;
-	if (caps.dst_addr_widths)
-		dest_width = __ffs(caps.dst_addr_widths);
-	else
-		dest_width = 1;
+	src_width = dma_bus_width_min(caps.src_bus_widths);
+	if (src_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
+		src_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+	dest_width = dma_bus_width_min(caps.dst_bus_widths);
+	if (dest_width == DMA_SLAVE_BUSWIDTH_UNDEFINED)
+		dest_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
+
 	width = max(src_width, dest_width);
 
 	INIT_LIST_HEAD(&dmaengine_buffer->active);

-- 
2.56.0