[Patch v2] spi: nxp-fspi: Add 1us delay to make controller ready for next transaction
kuldeep.singh at nxp.com
Tue Apr 21 08:27:47 CEST 2020
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>
v1: Add comments above udelay(1) change.
drivers/spi/nxp_fspi.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/spi/nxp_fspi.c b/drivers/spi/nxp_fspi.c
index 0e6c7be..1c6538c 100644
@@ -757,6 +757,13 @@ static int nxp_fspi_exec_op(struct spi_slave *slave,
FSPI_STS0_ARB_IDLE, 1, POLL_TOUT, true);
+ * Watchdog gets triggered for large read/write/erase since this
+ * delay is not present in this API(readl_poll_timeout), add
+ * this delay here.
* If we have large chunks of data, we read them through the AHB bus
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