[PATCH 21/30] spi: cadence_qspi: Enable ECO bit for higher frequencies

[Tejas Bhumkar]

From: Ashok Reddy Soma <ashok.reddy.soma at amd.com>

Enable ECO bit for Versal for frequencies above 120Mhz
for octal spi to work properly.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma at amd.com>
Signed-off-by: Tejas Bhumkar <tejas.arvind.bhumkar at amd.com>
---
 drivers/spi/cadence_qspi.h     | 1 +
 drivers/spi/cadence_qspi_apb.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/drivers/spi/cadence_qspi.h b/drivers/spi/cadence_qspi.h
index 73ef44fc1c..4906b9ef96 100644
--- a/drivers/spi/cadence_qspi.h
+++ b/drivers/spi/cadence_qspi.h
@@ -55,6 +55,7 @@
 #define CQSPI_READ_ID_LEN			3
 #define CQSPI_READID_LOOP_MAX			10
 #define TERA_MACRO				1000000000000l
+#define TAP_GRAN_SEL_MIN_FREQ			120000000
 
 #define OSPI_CTRL_RST				0xF1260304
 
diff --git a/drivers/spi/cadence_qspi_apb.c b/drivers/spi/cadence_qspi_apb.c
index 052d7a1766..43dc4c6e70 100644
--- a/drivers/spi/cadence_qspi_apb.c
+++ b/drivers/spi/cadence_qspi_apb.c
@@ -382,6 +382,10 @@ void cadence_qspi_apb_controller_init(struct cadence_spi_priv *priv)
 
 	writel(reg, priv->regbase + CQSPI_REG_CONFIG);
 
+	if (IS_ENABLED(CONFIG_ARCH_VERSAL) &&
+	    priv->ref_clk_hz >= TAP_GRAN_SEL_MIN_FREQ)
+		writel(1, priv->regbase + CQSPI_REG_ECO);
+
 	cadence_qspi_apb_controller_enable(priv->regbase);
 }
 
-- 
2.27.0