[PATCH] spi: nxp-fspi: Add 1us delay to make controller ready for next transaction

[Kuldeep Singh]

Board gets reset when performing burst read/write operations. On the
other hand, no such behaviour is observed on small size operations.

In Linux, readl_poll_timeout API already add delay of 1us which is
skipped in U-boot. Since, NXP Flexspi U-boot driver is a ported version
of Linux driver and U-boot poll_timeout API lacks delay functionality,
add 1us delay so as to make controller ready for other transactions.

Signed-off-by: Kuldeep Singh <kuldeep.singh at nxp.com>
---
 drivers/spi/nxp_fspi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/nxp_fspi.c b/drivers/spi/nxp_fspi.c
index 0e6c7be..9703642 100644
--- a/drivers/spi/nxp_fspi.c
+++ b/drivers/spi/nxp_fspi.c
@@ -756,6 +756,7 @@ static int nxp_fspi_exec_op(struct spi_slave *slave,
 	err = fspi_readl_poll_tout(f, f->iobase + FSPI_STS0,
 				   FSPI_STS0_ARB_IDLE, 1, POLL_TOUT, true);
 	WARN_ON(err);
+	udelay(1);
 
 	nxp_fspi_prepare_lut(f, op);
 	/*
-- 
2.7.4