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[v1,2/4] dmaengine: idma64: set maximum allowed segment size for DMA

Message ID 1447760230-98173-3-git-send-email-andriy.shevchenko@linux.intel.com (mailing list archive)
State Accepted
Headers show

Commit Message

Andy Shevchenko Nov. 17, 2015, 11:37 a.m. UTC 
This tells, for example, IOMMU what the maximum size of a segment
the DMA controller can send.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 drivers/dma/idma64.c | 2 ++
 drivers/dma/idma64.h | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/dma/idma64.c b/drivers/dma/idma64.c
index 6bba090..97802be 100644
--- a/drivers/dma/idma64.c
+++ b/drivers/dma/idma64.c
@@ -588,6 +588,8 @@  static int idma64_probe(struct idma64_chip *chip)
 
 	idma64->dma.dev = chip->dev;
 
+	dma_set_max_seg_size(idma64->dma.dev, IDMA64C_CTLH_BLOCK_TS_MASK);
+
 	ret = dma_async_device_register(&idma64->dma);
 	if (ret)
 		return ret;
diff --git a/drivers/dma/idma64.h b/drivers/dma/idma64.h
index f6aeff0..8423f13 100644
--- a/drivers/dma/idma64.h
+++ b/drivers/dma/idma64.h
@@ -54,7 +54,8 @@ 
 #define IDMA64C_CTLL_LLP_S_EN		(1 << 28)	/* src block chain */
 
 /* Bitfields in CTL_HI */
-#define IDMA64C_CTLH_BLOCK_TS(x)	((x) & ((1 << 17) - 1))
+#define IDMA64C_CTLH_BLOCK_TS_MASK	((1 << 17) - 1)
+#define IDMA64C_CTLH_BLOCK_TS(x)	((x) & IDMA64C_CTLH_BLOCK_TS_MASK)
 #define IDMA64C_CTLH_DONE		(1 << 17)
 
 /* Bitfields in CFG_LO */