This tells, for example, IOMMU what the maximum size of a segment
the DMA controller can send.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
drivers/dma/hsu/hsu.c | 2 ++
drivers/dma/hsu/hsu.h | 4 ++++
2 files changed, 6 insertions(+)
diff --git a/drivers/dma/hsu/hsu.c b/drivers/dma/hsu/hsu.c
index b89c89e..f8c5cd5 100644
--- a/drivers/dma/hsu/hsu.c
+++ b/drivers/dma/hsu/hsu.c
@@ -420,6 +420,8 @@ int hsu_dma_probe(struct hsu_dma_chip *chip)
hsu->dma.dev = chip->dev;
+ dma_set_max_seg_size(hsu->dma.dev, HSU_CH_DxTSR_MASK);
+
ret = dma_async_device_register(&hsu->dma);
if (ret)
return ret;
diff --git a/drivers/dma/hsu/hsu.h b/drivers/dma/hsu/hsu.h
index 6b070c2..486b023b 100644
--- a/drivers/dma/hsu/hsu.h
+++ b/drivers/dma/hsu/hsu.h
@@ -58,6 +58,10 @@
#define HSU_CH_DCR_CHEI BIT(23)
#define HSU_CH_DCR_CHTOI(x) BIT(24 + (x))
+/* Bits in HSU_CH_DxTSR */
+#define HSU_CH_DxTSR_MASK GENMASK(15, 0)
+#define HSU_CH_DxTSR_TSR(x) ((x) & HSU_CH_DxTSR_MASK)
+
struct hsu_dma_sg {
dma_addr_t addr;
unsigned int len;
--
2.7.0
--
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