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dmaengine: stm32-dma: check FIFO error interrupt enable

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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 <pierre-yves.mordret@st.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Yves MORDRET 2019-01-03 11:17:29 +01:00 committed by Vinod Koul
parent 906b40b246
commit ca4c72c01e
1 changed files with 8 additions and 5 deletions
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13
drivers/dma/stm32-dma.c
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@ -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);