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spi: stm32: make spurious and overrun interrupts visible

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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@foss.st.com>
Link: https://lore.kernel.org/r/1612551572-495-9-git-send-email-alain.volmat@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Alain Volmat 2021-02-05 19:59:32 +01:00 • committed by Mark Brown
parent e1e2093b16
commit c64e7efe46
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GPG key ID: 24D68B725D5487D0
1 changed files with 4 additions and 11 deletions
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15
drivers/spi/spi-stm32.c
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@ -895,8 +895,8 @@ static irqreturn_t stm32h7_spi_irq_thread(int irq, void *dev_id)
mask |= STM32H7_SPI_SR_RXP; mask |= STM32H7_SPI_SR_RXP;
if (!(sr & mask)) { if (!(sr & mask)) {
dev_dbg(spi->dev, "spurious IT (sr=0x%08x, ier=0x%08x)\n", dev_warn(spi->dev, "spurious IT (sr=0x%08x, ier=0x%08x)\n",
sr, ier); sr, ier);
spin_unlock_irqrestore(&spi->lock, flags); spin_unlock_irqrestore(&spi->lock, flags);
return IRQ_NONE; return IRQ_NONE;
} }
@ -923,15 +923,8 @@ static irqreturn_t stm32h7_spi_irq_thread(int irq, void *dev_id)
} }
if (sr & STM32H7_SPI_SR_OVR) { if (sr & STM32H7_SPI_SR_OVR) {
dev_warn(spi->dev, "Overrun: received value discarded\n"); dev_err(spi->dev, "Overrun: RX data lost\n");
if (!spi->cur_usedma && (spi->rx_buf && (spi->rx_len > 0))) end = true;
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;
} }
if (sr & STM32H7_SPI_SR_EOT) { if (sr & STM32H7_SPI_SR_EOT) {