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spi: cadence-quadspi: Wait at least 500 ms for direct reads 

When performing a direct read via DMA the timeout for completion is set
equal to the read length. This is fine for larger reads. For a small
read like the Read Status Register command, the timeout would be 1 or 2
milliseconds. This is not enough to cover the overhead needed in setting
up DMA.

Make sure the timeout is at least 500 ms to allow DMA ample time to
finish. For reads larger than 500 bytes, the timeout will continue to be
equal to the read length.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/20201222184425.7028-7-p.yadav@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Pratyush Yadav 2020-12-23 00:14:24 +05:30 committed by Mark Brown
parent a273596b9b
commit 0920a32cf6
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GPG Key ID: 24D68B725D5487D0
1 changed files with 1 additions and 1 deletions
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2
drivers/spi/spi-cadence-quadspi.c
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@ -963,7 +963,7 @@ static int cqspi_direct_read_execute(struct cqspi_flash_pdata *f_pdata,
dma_async_issue_pending(cqspi->rx_chan);
if (!wait_for_completion_timeout(&cqspi->rx_dma_complete,
msecs_to_jiffies(len))) {
msecs_to_jiffies(max(len, 500UL)))) {
dmaengine_terminate_sync(cqspi->rx_chan);
dev_err(dev, "DMA wait_for_completion_timeout\n");
ret = -ETIMEDOUT;