[U-Boot] [PATCH 6/7] spi: cadence_qspi: Fix CQSPI_CAL_DELAY calculation

[Phil Edworthy]

This change copes with the delay being less than a SCLK period.

Signed-off-by: Phil Edworthy <phil.edworthy at renesas.com>
---
 drivers/spi/cadence_qspi_apb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/cadence_qspi_apb.c b/drivers/spi/cadence_qspi_apb.c
index a0edeb8..533274d 100644
--- a/drivers/spi/cadence_qspi_apb.c
+++ b/drivers/spi/cadence_qspi_apb.c
@@ -170,7 +170,7 @@
 		CQSPI_REG_CONFIG_IDLE_LSB) & 0x1)
 
 #define CQSPI_CAL_DELAY(tdelay_ns, tref_ns, tsclk_ns)		\
-	((((tdelay_ns) - (tsclk_ns)) / (tref_ns)))
+	((tdelay_ns) > (tsclk_ns)) ? ((((tdelay_ns) - (tsclk_ns)) / (tref_ns))) : 0
 
 #define CQSPI_GET_RD_SRAM_LEVEL(reg_base)			\
 	(((readl(reg_base + CQSPI_REG_SDRAMLEVEL)) >>	\
-- 
2.5.0