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spi: xilinx: let transfers timeout in case of no IRQ

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In case of failed HW the driver may not see an interrupt and will stuck
in waiting forever. We can avoid such situation by timing out of
transfers if the interrupt is not seen in a reasonable time.

This problem can be found on unload of ptp_ocp driver for TimeCard which
uses Xilinx SPI AXI and SPI-NOR flash memory. During tear-down process
spi-nor drivers send soft reset command which is not triggering an
interrupt stalling the unload process completely.

Signed-off-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Acked-by: Michal Simek <michal.simek@amd.com>
Link: https://patch.msgid.link/20260610222843.782337-1-vadim.fedorenko@linux.dev
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Vadim Fedorenko 2026-06-10 22:28:43 +00:00 committed by Mark Brown
parent 3da90b2924
commit 0f95264f49
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GPG Key ID: 24D68B725D5487D0
1 changed files with 5 additions and 1 deletions
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6
drivers/spi/spi-xilinx.c
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@ -285,7 +285,11 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
if (use_irq) {
xspi->write_fn(cr, xspi->regs + XSPI_CR_OFFSET);
wait_for_completion(&xspi->done);
if (!wait_for_completion_timeout(&xspi->done, secs_to_jiffies(1))) {
dev_err(&spi->dev, "SPI transfer timed out\n");
xspi_init_hw(xspi);
return -ETIMEDOUT;
}
/* A transmit has just completed. Process received data
* and check for more data to transmit. Always inhibit
* the transmitter while the Isr refills the transmit