[U-Boot] [PATCH] spi: cadence_qspi_apb: Ensure baudrate doesn't exceed max value

[Chin Liang See]

Ensuring the baudrate divisor value doesn't exceed the max value
in the calculation.It will be capped at max value to ensure the
correct value being written into the register.

Signed-off-by: Chin Liang See <clsee at altera.com>
Cc: Marek Vasut <marex at denx.de>
Cc: Jagan Teki <jteki at openedev.com>
Cc: Dinh Nguyen <dinguyen at altera.com>
---
 drivers/spi/cadence_qspi_apb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/spi/cadence_qspi_apb.c b/drivers/spi/cadence_qspi_apb.c
index 1a35d55..e6a8ecb 100644
--- a/drivers/spi/cadence_qspi_apb.c
+++ b/drivers/spi/cadence_qspi_apb.c
@@ -293,6 +293,10 @@ void cadence_qspi_apb_config_baudrate_div(void *reg_base,
 	debug("%s: ref_clk %dHz sclk %dHz Div 0x%x\n", __func__,
 	      ref_clk_hz, sclk_hz, div);
 
+	/* ensure the baud rate doesn't exceed the max value */
+	if (div > CQSPI_REG_CONFIG_BAUD_MASK)
+		div = CQSPI_REG_CONFIG_BAUD_MASK;
+
 	div = (div & CQSPI_REG_CONFIG_BAUD_MASK) << CQSPI_REG_CONFIG_BAUD_LSB;
 	reg |= div;
 	writel(reg, reg_base + CQSPI_REG_CONFIG);
-- 
2.2.2