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authorAlexander Sverdlin <alexander.sverdlin@gmx.de>2016-01-07 23:05:48 +0100
committerVinod Koul <vinod.koul@intel.com>2016-01-25 09:49:55 +0530
commit94901e1b24496f04bd59176b7f87406e71505e27 (patch)
tree60da68d4d132eaae4e13092fe932e2f5fedd9a1b /drivers/dma/ioat
parentc9784a467380dfbd8070c735e651af07331172d9 (diff)
dmaengine: ep93xx: Treat STALL and NFB IRQs same way
Debugging ALSA hangups it was found that EP9302 (latest E2 rev.) DMA controller sometimes asserts STALL interrupt instead of NFB interrupt. Simply ignoring the difference and simply acting upon the amount of data we still have to transfer seems to work fine. This somehow sounds similar to M2M issue which is already dealt with in the driver, when the controller asserts DONE interrupt too early. The issue is not documented in Cirrus Logic erratas for EP93XX, but original Cirrus DMA driver from 2003 (not based on DMA API) did the similar handling of STALL interrupt. In-tree driver (6d831c65) did it also, before conversion to DMA engine API. Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/ioat')
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