[PATCH 05/15] spi: cadence-qspi: Do not calibrate when device tree sets read delay

[Pratyush Yadav <p.yadav@ti.com>]

If the device tree provides a read delay value, use that directly and do
not perform the calibration procedure.

This allows the device tree to over-ride the read delay value in cases
where the read delay value obtained via calibration is incorrect. One
such example is the Cypress Semper flash. It needs a read delay of 4 in
octal DTR mode. But since the calibration procedure is run before the
flash is switched in octal DTR mode, it yields a read delay of 2. A
value of 4 works for both octal DTR and legacy modes.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
 drivers/spi/cadence_qspi.c | 26 +++++++++++++++++++++-----
 drivers/spi/cadence_qspi.h |  1 +
 2 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/cadence_qspi.c b/drivers/spi/cadence_qspi.c
index 994a5948f1..d29e1a917a 100644
--- a/drivers/spi/cadence_qspi.c
+++ b/drivers/spi/cadence_qspi.c
@@ -140,12 +140,20 @@ static int cadence_spi_set_speed(struct udevice *bus, uint hz)
 	cadence_qspi_apb_controller_disable(priv->regbase);
 
 	/*
-	 * Calibration required for different current SCLK speed, requested
-	 * SCLK speed or chip select
+	 * If the device tree already provides a read delay value, use that
+	 * instead of calibrating.
 	 */
-	if (priv->previous_hz != hz ||
-	    priv->qspi_calibrated_hz != hz ||
-	    priv->qspi_calibrated_cs != spi_chip_select(bus)) {
+	if (plat->read_delay >= 0) {
+		cadence_spi_write_speed(bus, hz);
+		cadence_qspi_apb_readdata_capture(priv->regbase, 1,
+						  plat->read_delay);
+	} else if (priv->previous_hz != hz ||
+		   priv->qspi_calibrated_hz != hz ||
+		   priv->qspi_calibrated_cs != spi_chip_select(bus)) {
+		/*
+		 * Calibration required for different current SCLK speed,
+		 * requested SCLK speed or chip select
+		 */
 		err = spi_calibration(bus, hz);
 		if (err)
 			return err;
@@ -319,6 +327,14 @@ static int cadence_spi_ofdata_to_platdata(struct udevice *bus)
 						 255);
 	plat->tchsh_ns = ofnode_read_u32_default(subnode, "cdns,tchsh-ns", 20);
 	plat->tslch_ns = ofnode_read_u32_default(subnode, "cdns,tslch-ns", 20);
+	/*
+	 * Read delay should be an unsigned value but we use a signed integer
+	 * so that negative values can indicate that the device tree did not
+	 * specify any signed values and we need to perform the calibration
+	 * sequence to find it out.
+	 */
+	plat->read_delay = ofnode_read_s32_default(subnode, "cdns,read-delay",
+						   -1);
 
 	debug("%s: regbase=%p ahbbase=%p max-frequency=%d page-size=%d\n",
 	      __func__, plat->regbase, plat->ahbbase, plat->max_hz,
diff --git a/drivers/spi/cadence_qspi.h b/drivers/spi/cadence_qspi.h
index ae459c74a1..9dff2fdced 100644
--- a/drivers/spi/cadence_qspi.h
+++ b/drivers/spi/cadence_qspi.h
@@ -26,6 +26,7 @@ struct cadence_spi_platdata {
 	u32		trigger_address;
 	fdt_addr_t	ahbsize;
 	bool		use_dac_mode;
+	int		read_delay;
 
 	/* Flash parameters */
 	u32		page_size;
-- 
2.25.0