[PATCH] dmaengine: sun6i: Set the maximum segment size

[Samuel Holland]

The sun6i DMA engine supports segment sizes up to 2^25-1 bytes. This is
explicitly stated in newer SoC documentation (H6, D1), and it is implied
in older documentation by the 25-bit width of the "bytes left in the
current segment" register field.

Exposing the real segment size limit (instead of the 64k default)
reduces the number of SG list segments needed for a transaction.

Signed-off-by: Samuel Holland <samuel at sholland.org>
---
Tested on A64, verified that the maximum ALSA PCM period increased, and
that audio playback still worked.

 drivers/dma/sun6i-dma.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index b7557f437936..1425f87d97b7 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c
@@ -9,6 +9,7 @@
 
 #include <linux/clk.h>
 #include <linux/delay.h>
+#include <linux/dma-mapping.h>
 #include <linux/dmaengine.h>
 #include <linux/dmapool.h>
 #include <linux/interrupt.h>
@@ -1334,6 +1335,8 @@ static int sun6i_dma_probe(struct platform_device *pdev)
 	INIT_LIST_HEAD(&sdc->pending);
 	spin_lock_init(&sdc->lock);
 
+	dma_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(25));
+
 	dma_cap_set(DMA_PRIVATE, sdc->slave.cap_mask);
 	dma_cap_set(DMA_MEMCPY, sdc->slave.cap_mask);
 	dma_cap_set(DMA_SLAVE, sdc->slave.cap_mask);
-- 
2.35.1