[PATCH 0/5] dmaengine: core/edma/omap-dma: maximum SG len reporting

Peter Ujfalusi
2017-09-12T10:45:40Z

﻿Hi,

Both TI eDMA and sDMA have limitation on the number of bursts it can handle
within one trasnfer (CCNT in eDMA and CFN in sDMA are 16bit unsigned counters).

If the the length of the SG in the sglist is bigger than what can be supported
we either have corrupted data or failure in the setup phase.

Add device_get_max_len() callback to devices where they can report such length
restriction to client drivers so they can set up their SGlist that each
element's length is going to be within the supported range.

The first two patch is not strictly related to this issue, but it is needed that
both eDMA and sDMA will have valid max_burst length.

Regards,
Peter
---
Peter Ujfalusi (5):
dmaengine: edma: Implement protection for invalid max_burst
dmaengine: omap-dma: Implement protection for invalid max_burst
dmaengine: Support for querying maximum trasnfer length (of an SG
element)
dmaengine: edma: Implement device_get_max_len callback
dmaengine: omap-dma: Implement device_get_max_len callback

drivers/dma/edma.c | 28 ++++++++++++++++++++++++++++
drivers/dma/omap-dma.c | 28 ++++++++++++++++++++++++++++
include/linux/dmaengine.h | 14 ++++++++++++++
3 files changed, 70 insertions(+)

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2.14.1