@@ -514,6 +514,12 @@ static irqreturn_t stm32_spi_irq(int irq, void *dev_id)
dev_warn(spi->dev, "Communication suspended\n");
if (!spi->cur_usedma && (spi->rx_buf && (spi->rx_len > 0)))
stm32_spi_read_rxfifo(spi, false);
+ /*
+ * If communication is suspended while using DMA, it means
+ * that something went wrong, so stop the current transfer
+ */
+ if (spi->cur_usedma)
+ end = true;
}
if (sr & SPI_SR_MODF) {
@@ -525,6 +531,12 @@ static irqreturn_t stm32_spi_irq(int irq, void *dev_id)
dev_warn(spi->dev, "Overrun: received value discarded\n");
if (!spi->cur_usedma && (spi->rx_buf && (spi->rx_len > 0)))
stm32_spi_read_rxfifo(spi, false);
+ /*
+ * If overrun is detected while using DMA, it means that
+ * something went wrong, so stop the current transfer
+ */
+ if (spi->cur_usedma)
+ end = true;
}
if (sr & SPI_SR_EOT) {
@@ -645,12 +657,10 @@ static void stm32_spi_dma_cb(void *data)
spin_unlock_irqrestore(&spi->lock, flags);
- if (!(sr & SPI_SR_EOT)) {
- dev_warn(spi->dev, "DMA callback (sr=0x%08x)\n", sr);
+ if (!(sr & SPI_SR_EOT))
+ dev_warn(spi->dev, "DMA error (sr=0x%08x)\n", sr);
- spi_finalize_current_transfer(spi->master);
- stm32_spi_disable(spi);
- }
+ /* Now wait for EOT, or SUSP or OVR in case of error */
}
/**
This patch reworks DMA error management. In case the DMA callback is called while EOT (End Of Transfer) flag is not set, that means that DMA encountered an error. This error will result in an auto-suspend of SPI flow, which could also result in an overrun. So, in DMA mode, SUSP and OVR flags are a condition to stop the current transfer. Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com> --- drivers/spi/spi-stm32.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-)