tree 3ad7c738040a7c7851cc032ca60f5017f5bfa8cb
parent 027f28b7bb589d726e3b6274a7d9272336522c65
author Xiang Wang <wangx@marvell.com> 1371538559 +0800
committer Vinod Koul <vinod.koul@intel.com> 1375675347 +0530

dma: mmp_pdma: clear DRCMR when free a phy channel

In mmp pdma, phy channels are allocated/freed dynamically.
The mapping from DMA request to DMA channel number in DRCMR
should be cleared when a phy channel is freed. Otherwise
conflicts will happen when:
1. A is using channel 2 and free it after finished, but A
still maps to channel 2 in DRCMR of A.
2. Now another one B gets channel 2. So B maps to channel 2
too in DRCMR of B.
In the datasheet, it is described that "Do not map two active
requests to the same channel since it produces unpredictable
results" and we can observe that during test.

Signed-off-by: Xiang Wang <wangx@marvell.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>