diff options
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/stm32-dma.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c index d2365fab1b7a..5afe4205f57b 100644 --- a/drivers/dma/stm32-dma.c +++ b/drivers/dma/stm32-dma.c @@ -535,6 +535,13 @@ static void stm32_dma_dump_reg(struct stm32_dma_chan *chan) dev_dbg(chan2dev(chan), "SFCR: 0x%08x\n", sfcr); } +static void stm32_dma_sg_inc(struct stm32_dma_chan *chan) +{ + chan->next_sg++; + if (chan->desc->cyclic && (chan->next_sg == chan->desc->num_sgs)) + chan->next_sg = 0; +} + static void stm32_dma_configure_next_sg(struct stm32_dma_chan *chan); static void stm32_dma_start_transfer(struct stm32_dma_chan *chan) @@ -575,7 +582,7 @@ static void stm32_dma_start_transfer(struct stm32_dma_chan *chan) stm32_dma_write(dmadev, STM32_DMA_SM1AR(chan->id), reg->dma_sm1ar); stm32_dma_write(dmadev, STM32_DMA_SNDTR(chan->id), reg->dma_sndtr); - chan->next_sg++; + stm32_dma_sg_inc(chan); /* Clear interrupt status if it is there */ status = stm32_dma_irq_status(chan); @@ -606,9 +613,6 @@ static void stm32_dma_configure_next_sg(struct stm32_dma_chan *chan) dma_scr = stm32_dma_read(dmadev, STM32_DMA_SCR(id)); if (dma_scr & STM32_DMA_SCR_DBM) { - if (chan->next_sg == chan->desc->num_sgs) - chan->next_sg = 0; - sg_req = &chan->desc->sg_req[chan->next_sg]; if (dma_scr & STM32_DMA_SCR_CT) { @@ -630,7 +634,7 @@ static void stm32_dma_handle_chan_done(struct stm32_dma_chan *chan) if (chan->desc) { if (chan->desc->cyclic) { vchan_cyclic_callback(&chan->desc->vdesc); - chan->next_sg++; + stm32_dma_sg_inc(chan); stm32_dma_configure_next_sg(chan); } else { chan->busy = false; |