From: Alain Volmat <alain.volmat@xxxxxxxxxxx> [ Upstream commit c64e7efe46b7de21937ef4b3594d9b1fc74f07df ] We do not expect to receive spurious interrupts so rise a warning if it happens. RX overrun is an error condition that signals a corrupted RX stream both in dma and in irq modes. Report the error and abort the transfer in either cases. Signed-off-by: Alain Volmat <alain.volmat@xxxxxxxxxxx> Link: https://lore.kernel.org/r/1612551572-495-9-git-send-email-alain.volmat@xxxxxxxxxxx Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/spi/spi-stm32.c | 15 ++++----------- 1 file changed, 4 insertions(+), 11 deletions(-) diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c index 6017209c6d2f..4bcdad084801 100644 --- a/drivers/spi/spi-stm32.c +++ b/drivers/spi/spi-stm32.c @@ -928,8 +928,8 @@ static irqreturn_t stm32h7_spi_irq_thread(int irq, void *dev_id) mask |= STM32H7_SPI_SR_RXP; if (!(sr & mask)) { - dev_dbg(spi->dev, "spurious IT (sr=0x%08x, ier=0x%08x)\n", - sr, ier); + dev_warn(spi->dev, "spurious IT (sr=0x%08x, ier=0x%08x)\n", + sr, ier); spin_unlock_irqrestore(&spi->lock, flags); return IRQ_NONE; } @@ -956,15 +956,8 @@ static irqreturn_t stm32h7_spi_irq_thread(int irq, void *dev_id) } if (sr & STM32H7_SPI_SR_OVR) { - dev_warn(spi->dev, "Overrun: received value discarded\n"); - if (!spi->cur_usedma && (spi->rx_buf && (spi->rx_len > 0))) - stm32h7_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; + dev_err(spi->dev, "Overrun: RX data lost\n"); + end = true; } if (sr & STM32H7_SPI_SR_EOT) { -- 2.30.1
