For avoiding false FIFO detection, check FIFO Error interrupt is
enabled prior raising any errors.
This will prevent having spurious FIFO error where it shouldn't.
Signed-off-by: Pierre-Yves MORDRET <[email protected]>
---
Version history:
v1:
* Initial
---
---
drivers/dma/stm32-dma.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index 4903a40..48f7c0f 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -641,12 +641,13 @@ static irqreturn_t stm32_dma_chan_irq(int irq, void *devid)
{
struct stm32_dma_chan *chan = devid;
struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
- u32 status, scr;
+ u32 status, scr, sfcr;
spin_lock(&chan->vchan.lock);
status = stm32_dma_irq_status(chan);
scr = stm32_dma_read(dmadev, STM32_DMA_SCR(chan->id));
+ sfcr = stm32_dma_read(dmadev, STM32_DMA_SFCR(chan->id));
if (status & STM32_DMA_TCI) {
stm32_dma_irq_clear(chan, STM32_DMA_TCI);
@@ -661,10 +662,12 @@ static irqreturn_t stm32_dma_chan_irq(int irq, void *devid)
if (status & STM32_DMA_FEI) {
stm32_dma_irq_clear(chan, STM32_DMA_FEI);
status &= ~STM32_DMA_FEI;
- if (!(scr & STM32_DMA_SCR_EN))
- dev_err(chan2dev(chan), "FIFO Error\n");
- else
- dev_dbg(chan2dev(chan), "FIFO over/underrun\n");
+ if (sfcr & STM32_DMA_SFCR_FEIE) {
+ if (!(scr & STM32_DMA_SCR_EN))
+ dev_err(chan2dev(chan), "FIFO Error\n");
+ else
+ dev_dbg(chan2dev(chan), "FIFO over/underrun\n");
+ }
}
if (status) {
stm32_dma_irq_clear(chan, status);
--
2.7.4