[PATCH v2 6/9] spi: bcm63xx-hsspi: Fix multi-bit mode setting

[William Zhang]

Currently the driver always sets the controller to dual data bit mode
for both tx and rx data in the profile mode control register even for
single data bit transfer. Luckily the opcode is set correctly according
to SPI transfer data bit width so it does not actually cause issues.

This change fixes the problem by setting tx and rx data bit mode field
correctly according to the actual SPI transfer tx and rx data bit width.

Fixes: 29cc4368ad4b ("dm: spi: add BCM63xx HSSPI driver")

Port from linux patch:
Link: https://lore.kernel.org/r/20230209200246.141520-11-william.zhang@broadcom.com

Signed-off-by: William Zhang <william.zhang at broadcom.com>
---

Changes in v2: None

 drivers/spi/bcm63xx_hsspi.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/bcm63xx_hsspi.c b/drivers/spi/bcm63xx_hsspi.c
index 495feba02262..0d12c345b1dd 100644
--- a/drivers/spi/bcm63xx_hsspi.c
+++ b/drivers/spi/bcm63xx_hsspi.c
@@ -221,7 +221,7 @@ static int bcm63xx_hsspi_xfer(struct udevice *dev, unsigned int bitlen,
 	size_t data_bytes = bitlen / 8;
 	size_t step_size = HSSPI_FIFO_SIZE;
 	uint16_t opcode = 0;
-	uint32_t val;
+	uint32_t val = SPI_PFL_MODE_FILL_MASK;
 	const uint8_t *tx = dout;
 	uint8_t *rx = din;
 
@@ -240,14 +240,17 @@ static int bcm63xx_hsspi_xfer(struct udevice *dev, unsigned int bitlen,
 		step_size -= HSSPI_FIFO_OP_SIZE;
 
 	/* dual mode */
-	if ((opcode == HSSPI_FIFO_OP_CODE_R && plat->mode == SPI_RX_DUAL) ||
-	    (opcode == HSSPI_FIFO_OP_CODE_W && plat->mode == SPI_TX_DUAL))
+	if ((opcode == HSSPI_FIFO_OP_CODE_R && (plat->mode & SPI_RX_DUAL)) ||
+	    (opcode == HSSPI_FIFO_OP_CODE_W && (plat->mode & SPI_TX_DUAL))) {
 		opcode |= HSSPI_FIFO_OP_MBIT_MASK;
 
-	/* profile mode */
-	val = SPI_PFL_MODE_FILL_MASK |
-	      SPI_PFL_MODE_MDRDSZ_MASK |
-	      SPI_PFL_MODE_MDWRSZ_MASK;
+		/* profile mode */
+		if (plat->mode & SPI_RX_DUAL)
+			val |= SPI_PFL_MODE_MDRDSZ_MASK;
+		if (plat->mode & SPI_TX_DUAL)
+			val |= SPI_PFL_MODE_MDWRSZ_MASK;
+	}
+
 	if (plat->mode & SPI_3WIRE)
 		val |= SPI_PFL_MODE_3WIRE_MASK;
 	writel(val, priv->regs + SPI_PFL_MODE_REG(plat->cs));
-- 
2.37.3