On latest iMX platforms like iMX7D/iMX6UL/iMX8MQ, the QSPI controller
is updated to have TDH field in FLSHCR register. According to reference
manual, this TDH must be set to 1 when DDR_EN is set. Otherwise, the TX
DDR delay logic won't be enabled.

Another issue in DDR mode is the MCR register will be overwritten in
every read/write/erase operation. This causes DDR_EN been cleared while
TDH=1, then no clk2x output for TX data shift and all operations will
fail.

Signed-off-by: Ye Li <ye...@nxp.com>
---
 drivers/spi/fsl_qspi.c | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/fsl_qspi.c b/drivers/spi/fsl_qspi.c
index 41abe19..8845986 100644
--- a/drivers/spi/fsl_qspi.c
+++ b/drivers/spi/fsl_qspi.c
@@ -399,7 +399,7 @@ static inline void qspi_ahb_read(struct fsl_qspi_priv 
*priv, u8 *rxbuf, int len)
 
        qspi_write32(priv->flags, &regs->mcr,
                     QSPI_MCR_CLR_RXF_MASK | QSPI_MCR_CLR_TXF_MASK |
-                    QSPI_MCR_RESERVED_MASK | QSPI_MCR_END_CFD_LE);
+                    mcr_reg);
 
        rx_addr = (void *)(uintptr_t)(priv->cur_amba_base + priv->sf_addr);
        /* Read out the data directly from the AHB buffer. */
@@ -429,6 +429,14 @@ static void qspi_enable_ddr_mode(struct fsl_qspi_priv 
*priv)
        reg |= BIT(29);
 
        qspi_write32(priv->flags, &regs->mcr, reg);
+
+       /* Enable the TDH to 1 for some platforms like imx6ul, imx7d, etc
+        * These two bits are reserved on other platforms
+        */
+       reg = qspi_read32(priv->flags, &regs->flshcr);
+       reg &= ~(BIT(17));
+       reg |= BIT(16);
+       qspi_write32(priv->flags, &regs->flshcr, reg);
 }
 
 /*
@@ -482,7 +490,7 @@ static void qspi_op_rdbank(struct fsl_qspi_priv *priv, u8 
*rxbuf, u32 len)
        mcr_reg = qspi_read32(priv->flags, &regs->mcr);
        qspi_write32(priv->flags, &regs->mcr,
                     QSPI_MCR_CLR_RXF_MASK | QSPI_MCR_CLR_TXF_MASK |
-                    QSPI_MCR_RESERVED_MASK | QSPI_MCR_END_CFD_LE);
+                    mcr_reg);
        qspi_write32(priv->flags, &regs->rbct, QSPI_RBCT_RXBRD_USEIPS);
 
        qspi_write32(priv->flags, &regs->sfar, priv->cur_amba_base);
@@ -527,7 +535,7 @@ static void qspi_op_rdid(struct fsl_qspi_priv *priv, u32 
*rxbuf, u32 len)
        mcr_reg = qspi_read32(priv->flags, &regs->mcr);
        qspi_write32(priv->flags, &regs->mcr,
                     QSPI_MCR_CLR_RXF_MASK | QSPI_MCR_CLR_TXF_MASK |
-                    QSPI_MCR_RESERVED_MASK | QSPI_MCR_END_CFD_LE);
+                    mcr_reg);
        qspi_write32(priv->flags, &regs->rbct, QSPI_RBCT_RXBRD_USEIPS);
 
        qspi_write32(priv->flags, &regs->sfar, priv->cur_amba_base);
@@ -573,7 +581,7 @@ static void qspi_op_read(struct fsl_qspi_priv *priv, u32 
*rxbuf, u32 len)
        mcr_reg = qspi_read32(priv->flags, &regs->mcr);
        qspi_write32(priv->flags, &regs->mcr,
                     QSPI_MCR_CLR_RXF_MASK | QSPI_MCR_CLR_TXF_MASK |
-                    QSPI_MCR_RESERVED_MASK | QSPI_MCR_END_CFD_LE);
+                    mcr_reg);
        qspi_write32(priv->flags, &regs->rbct, QSPI_RBCT_RXBRD_USEIPS);
 
        to_or_from = priv->sf_addr + priv->cur_amba_base;
@@ -625,7 +633,7 @@ static void qspi_op_write(struct fsl_qspi_priv *priv, u8 
*txbuf, u32 len)
        mcr_reg = qspi_read32(priv->flags, &regs->mcr);
        qspi_write32(priv->flags, &regs->mcr,
                     QSPI_MCR_CLR_RXF_MASK | QSPI_MCR_CLR_TXF_MASK |
-                    QSPI_MCR_RESERVED_MASK | QSPI_MCR_END_CFD_LE);
+                    mcr_reg);
        qspi_write32(priv->flags, &regs->rbct, QSPI_RBCT_RXBRD_USEIPS);
 
        status_reg = 0;
@@ -700,7 +708,7 @@ static void qspi_op_rdsr(struct fsl_qspi_priv *priv, void 
*rxbuf, u32 len)
        mcr_reg = qspi_read32(priv->flags, &regs->mcr);
        qspi_write32(priv->flags, &regs->mcr,
                     QSPI_MCR_CLR_RXF_MASK | QSPI_MCR_CLR_TXF_MASK |
-                    QSPI_MCR_RESERVED_MASK | QSPI_MCR_END_CFD_LE);
+                    mcr_reg);
        qspi_write32(priv->flags, &regs->rbct, QSPI_RBCT_RXBRD_USEIPS);
 
        qspi_write32(priv->flags, &regs->sfar, priv->cur_amba_base);
@@ -737,7 +745,7 @@ static void qspi_op_erase(struct fsl_qspi_priv *priv)
        mcr_reg = qspi_read32(priv->flags, &regs->mcr);
        qspi_write32(priv->flags, &regs->mcr,
                     QSPI_MCR_CLR_RXF_MASK | QSPI_MCR_CLR_TXF_MASK |
-                    QSPI_MCR_RESERVED_MASK | QSPI_MCR_END_CFD_LE);
+                    mcr_reg);
        qspi_write32(priv->flags, &regs->rbct, QSPI_RBCT_RXBRD_USEIPS);
 
        to_or_from = priv->sf_addr + priv->cur_amba_base;
@@ -900,15 +908,9 @@ static int fsl_qspi_probe(struct udevice *bus)
                return ret;
        }
 
-       mcr_val = qspi_read32(priv->flags, &priv->regs->mcr);
-
-       /* Set endianness to LE for i.mx */
-       if (IS_ENABLED(CONFIG_MX6) || IS_ENABLED(CONFIG_MX7))
-               mcr_val = QSPI_MCR_END_CFD_LE;
-
        qspi_write32(priv->flags, &priv->regs->mcr,
                     QSPI_MCR_RESERVED_MASK | QSPI_MCR_MDIS_MASK |
-                    (mcr_val & QSPI_MCR_END_CFD_MASK));
+                    QSPI_MCR_END_CFD_LE);
 
        qspi_cfg_smpr(priv, ~(QSPI_SMPR_FSDLY_MASK | QSPI_SMPR_DDRSMP_MASK |
                QSPI_SMPR_FSPHS_MASK | QSPI_SMPR_HSENA_MASK), 0);
-- 
2.7.4

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