From: Kedareswara rao Appana Date: Fri, 26 Feb 2016 14:03:53 +0000 (+0530) Subject: dmaengine: xilinx_vdma: Fix issues with non-parking mode X-Git-Tag: archive/raspbian/4.9.13-1+rpi1~10^2~2727^2^2~3 X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https:/www.github.com/%22bookmarks:///%22http:/www.example.com/cgi/%22https:/www.github.com/%22bookmarks:/?a=commitdiff_plain;h=e2b538a77d99706a9d2dc12925f3f8477c724dcc;p=linux-4.9.git dmaengine: xilinx_vdma: Fix issues with non-parking mode 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 Signed-off-by: Vinod Koul --- diff --git a/drivers/dma/xilinx/xilinx_vdma.c b/drivers/dma/xilinx/xilinx_vdma.c index 06bffec934d2..e96ff9dea40d 100644 --- a/drivers/dma/xilinx/xilinx_vdma.c +++ b/drivers/dma/xilinx/xilinx_vdma.c @@ -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