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dmaengine: xilinx_vdma: Fix issues with non-parking mode

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This patch fixes issues with the Non-parking mode(Cirular mode).
With the  existing driver in cirular mode if we submit frames less than h/w
configured we simply end-up having misconfigured vdma h/w.
This patch fixes this issue by configuring the frame count register.

Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Kedareswara rao Appana 2016-02-26 19:33:53 +05:30 committed by Vinod Koul
parent 7096f36e53
commit e2b538a77d
1 changed files with 4 additions and 0 deletions
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4
drivers/dma/xilinx/xilinx_vdma.c
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@ -648,6 +648,10 @@ static void xilinx_vdma_start_transfer(struct xilinx_vdma_chan *chan)
else
reg &= ~XILINX_VDMA_DMACR_FRAMECNT_EN;
/* Configure channel to allow number frame buffers */
vdma_ctrl_write(chan, XILINX_VDMA_REG_FRMSTORE,
chan->desc_pendingcount);
/*
* With SG, start with circular mode, so that BDs can be fetched.
* In direct register mode, if not parking, enable circular mode