linux-kernel - [PATCH 1/2] spi: cadence-quadspi: Update the read timeout based on the length

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Date:   Mon, 20 Mar 2023 15:29:30 +0530
From:   Sai Krishna Potthuri <sai.krishna.potthuri@....com>
To:     Mark Brown <broonie@...nel.org>
CC:     <linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <git@....com>, <saikrishna12468@...il.com>,
        Sai Krishna Potthuri <sai.krishna.potthuri@....com>
Subject: [PATCH 1/2] spi: cadence-quadspi: Update the read timeout based on the length

When performing indirect read via external DMA the timeout for
completion is set equal to the read length instead of fixed timeout value.
For reads larger than 500 bytes, the timeout will continue to be
equal to the read length whereas 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, in that case make
sure the timeout is at least 500ms to allow DMA to finish. This solution
is inline with the timeout used for Direct read via DMA.

Signed-off-by: Sai Krishna Potthuri <sai.krishna.potthuri@....com>
---
 drivers/spi/spi-cadence-quadspi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index 79ab7e309644..e281732aba91 100644
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -863,7 +863,7 @@ static int cqspi_versal_indirect_read_dma(struct cqspi_flash_pdata *f_pdata,
 	reinit_completion(&cqspi->transfer_complete);

 	if (!wait_for_completion_timeout(&cqspi->transfer_complete,
-					 msecs_to_jiffies(CQSPI_READ_TIMEOUT_MS))) {
+					 msecs_to_jiffies(max_t(size_t, bytes_to_dma, 500)))) {
 		ret = -ETIMEDOUT;
 		goto failrd;
 	}
-- 
2.25.1