android/android_kernel_samsung_sm8650
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

dmaengine: stm32-dma: fix incomplete configuration in cyclic mode

Browse Source 
When in cyclic mode, the configuration is updated after having started the
DMA hardware (STM32_DMA_SCR_EN) leading to incomplete configuration of
SMxAR registers.

Signed-off-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com>
Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Pierre Yves MORDRET 2018-03-13 17:42:06 +01:00 committed by Vinod Koul
parent 951f44cb6c
commit e57cb3b3f1
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/dma/stm32-dma.c
View File

@ -441,6 +441,8 @@ static void stm32_dma_dump_reg(struct stm32_dma_chan *chan)
dev_dbg(chan2dev(chan), "SFCR: 0x%08x\n", sfcr);
}
static void stm32_dma_configure_next_sg(struct stm32_dma_chan *chan);
static void stm32_dma_start_transfer(struct stm32_dma_chan *chan)
{
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
@ -483,6 +485,9 @@ static void stm32_dma_start_transfer(struct stm32_dma_chan *chan)
if (status)
stm32_dma_irq_clear(chan, status);
if (chan->desc->cyclic)
stm32_dma_configure_next_sg(chan);
stm32_dma_dump_reg(chan);
/* Start DMA */
@ -576,8 +581,7 @@ static void stm32_dma_issue_pending(struct dma_chan *c)
if (vchan_issue_pending(&chan->vchan) && !chan->desc && !chan->busy) {
dev_dbg(chan2dev(chan), "vchan %p: issued\n", &chan->vchan);
stm32_dma_start_transfer(chan);
if (chan->desc->cyclic)
stm32_dma_configure_next_sg(chan);
}
spin_unlock_irqrestore(&chan->vchan.lock, flags);
}