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dmaengine: xilinx_dma: Configure parking registers only if parking enabled

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The VDMA can work in two modes, parking or circular. Do not program the
parking mode registers in case circular mode is used, it is useless.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Link: https://lore.kernel.org/r/20241031171132.56861-1-marex@denx.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Marek Vasut
2024-10-31 18:11:04 +01:00
committed by Vinod Koul
parent 0f31c09122
commit 8a20040f9d
1 changed files with 11 additions and 9 deletions
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20
drivers/dma/xilinx/xilinx_dma.c
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@@ -1404,16 +1404,18 @@ static void xilinx_vdma_start_transfer(struct xilinx_dma_chan *chan)
dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
j = chan->desc_submitcount;
reg = dma_read(chan, XILINX_DMA_REG_PARK_PTR);
if (chan->direction == DMA_MEM_TO_DEV) {
reg &= ~XILINX_DMA_PARK_PTR_RD_REF_MASK;
reg |= j << XILINX_DMA_PARK_PTR_RD_REF_SHIFT;
} else {
reg &= ~XILINX_DMA_PARK_PTR_WR_REF_MASK;
reg |= j << XILINX_DMA_PARK_PTR_WR_REF_SHIFT;
if (config->park) {
j = chan->desc_submitcount;
reg = dma_read(chan, XILINX_DMA_REG_PARK_PTR);
if (chan->direction == DMA_MEM_TO_DEV) {
reg &= ~XILINX_DMA_PARK_PTR_RD_REF_MASK;
reg |= j << XILINX_DMA_PARK_PTR_RD_REF_SHIFT;
} else {
reg &= ~XILINX_DMA_PARK_PTR_WR_REF_MASK;
reg |= j << XILINX_DMA_PARK_PTR_WR_REF_SHIFT;
}
dma_write(chan, XILINX_DMA_REG_PARK_PTR, reg);
}
dma_write(chan, XILINX_DMA_REG_PARK_PTR, reg);
/* Start the hardware */
xilinx_dma_start(chan);