[PATCH 3/4] spi: zynq_qspi: Add a check for baudrate and set default if not in limits

[Ashok Reddy Soma]

From: Siva Durga Prasad Paladugu <siva.durga.paladugu at xilinx.com>

Add a check afer baudrate calculation to see if the resultant value
falls within the range, else set it to default baudrate value.

Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu at xilinx.com>
Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma at xilinx.com>
---

 drivers/spi/zynq_qspi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/spi/zynq_qspi.c b/drivers/spi/zynq_qspi.c
index aa060d7940..2963f48bb0 100644
--- a/drivers/spi/zynq_qspi.c
+++ b/drivers/spi/zynq_qspi.c
@@ -49,6 +49,9 @@ DECLARE_GLOBAL_DATA_PTR;
 #define ZYNQ_QSPI_CR_BAUD_SHIFT		3	/* Baud rate divisor shift */
 #define ZYNQ_QSPI_CR_SS_SHIFT		10	/* Slave select shift */
 
+#define ZYNQ_QSPI_MAX_BAUD_RATE		0x7
+#define ZYNQ_QSPI_DEFAULT_BAUD_RATE	0x2
+
 #define ZYNQ_QSPI_FIFO_DEPTH		63
 #define ZYNQ_QSPI_WAIT			(CONFIG_SYS_HZ / 100)	/* 10 ms */
 
@@ -621,6 +624,9 @@ static int zynq_qspi_set_speed(struct udevice *bus, uint speed)
 		       (2 << baud_rate_val)) > speed))
 			baud_rate_val++;
 
+		if (baud_rate_val > ZYNQ_QSPI_MAX_BAUD_RATE)
+			baud_rate_val = ZYNQ_QSPI_DEFAULT_BAUD_RATE;
+
 		plat->speed_hz = speed / (2 << baud_rate_val);
 	}
 	confr &= ~ZYNQ_QSPI_CR_BAUD_MASK;
-- 
2.17.1