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[U-Boot,3/4] spi: cadence_qspi: Ensure check for max frequency in place

Message ID 1441287722-2250-3-git-send-email-clsee@altera.com
State Superseded
Delegated to: Marek Vasut
Headers show

Commit Message

Chin Liang See Sept. 3, 2015, 1:42 p.m. UTC 
Ensure the intended SCLK frequency not exceeding the maximum
frequency. If that happen, SCLK will set to maximum frequency.

Signed-off-by: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Dinh Nguyen <dinh.linux@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Stefan Roese <sr@denx.de>
Cc: Vikas Manocha <vikas.manocha@st.com>
Cc: Jagannadh Teki <jteki@openedev.com>
Cc: Pavel Machek <pavel@denx.de>
---
 drivers/spi/cadence_qspi.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
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Patch

diff --git a/drivers/spi/cadence_qspi.c b/drivers/spi/cadence_qspi.c
index a00af87..52c29d5 100644
--- a/drivers/spi/cadence_qspi.c
+++ b/drivers/spi/cadence_qspi.c
@@ -123,6 +123,11 @@  static int cadence_spi_set_speed(struct udevice *bus, uint hz)
 	struct cadence_spi_priv *priv = dev_get_priv(bus);
 	int err;
 
+	if (hz > plat->max_hz) {
+		hz = plat->max_hz;
+		puts("SF: Default to maximum supported SCLK frequency\n");
+	}
+
 	/* Disable QSPI */
 	cadence_qspi_apb_controller_disable(priv->regbase);