[PATCH 2/7] spi: atmel-quadspi: Port collected fixes from Linux v5.10 and v5.15

[Alexander Dahl]

Port changes from a 4 piece patch series from Linux kernel v5.10, merged
with v5.10-rc1-83-gc732b7567d869 ("Merge series "spi: atmel-quadspi: Fix
AHB memory accesses" from Tudor Ambarus …").

Port the single fix v5.15-rc1-14-g09134c5322df9 ("spi: Fixed division by
zero warning").

Reduces differences between linux and u-boot driver.

Cc: Tudor Ambarus <tudor.amba...@microchip.com>
Cc: Yoshitaka Ikeda <ik...@nskint.co.jp>
Signed-off-by: Alexander Dahl <a...@thorsis.com>
---
 drivers/spi/atmel-quadspi.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c
index 3efb661803b..ea045acab65 100644
--- a/drivers/spi/atmel-quadspi.c
+++ b/drivers/spi/atmel-quadspi.c
@@ -474,7 +474,7 @@ static int atmel_qspi_set_cfg(struct atmel_qspi *aq,
                return mode;
        ifr |= atmel_qspi_modes[mode].config;
 
-       if (op->dummy.buswidth && op->dummy.nbytes)
+       if (op->dummy.nbytes)
                dummy_cycles = op->dummy.nbytes * 8 / op->dummy.buswidth;
 
        /*
@@ -529,10 +529,14 @@ static int atmel_qspi_set_cfg(struct atmel_qspi *aq,
        if (dummy_cycles)
                ifr |= QSPI_IFR_NBDUM(dummy_cycles);
 
-       /* Set data enable */
-       if (op->data.nbytes)
+       /* Set data enable and data transfer type. */
+       if (op->data.nbytes) {
                ifr |= QSPI_IFR_DATAEN;
 
+               if (op->addr.nbytes)
+                       ifr |= QSPI_IFR_TFRTYP_MEM;
+       }
+
        /*
         * If the QSPI controller is set in regular SPI mode, set it in
         * Serial Memory Mode (SMM).
@@ -545,27 +549,24 @@ static int atmel_qspi_set_cfg(struct atmel_qspi *aq,
        /* Clear pending interrupts */
        (void)atmel_qspi_read(aq, QSPI_SR);
 
-       if (aq->caps->has_ricr) {
-               if (!op->addr.nbytes && op->data.dir == SPI_MEM_DATA_IN)
-                       ifr |= QSPI_IFR_APBTFRTYP_READ;
-
-               /* Set QSPI Instruction Frame registers */
+       /* Set QSPI Instruction Frame registers. */
+       if (op->addr.nbytes && !op->data.nbytes)
                atmel_qspi_write(iar, aq, QSPI_IAR);
+
+       if (aq->caps->has_ricr) {
                if (op->data.dir == SPI_MEM_DATA_IN)
                        atmel_qspi_write(icr, aq, QSPI_RICR);
                else
                        atmel_qspi_write(icr, aq, QSPI_WICR);
-               atmel_qspi_write(ifr, aq, QSPI_IFR);
        } else {
-               if (op->data.dir == SPI_MEM_DATA_OUT)
+               if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT)
                        ifr |= QSPI_IFR_SAMA5D2_WRITE_TRSFR;
 
-               /* Set QSPI Instruction Frame registers */
-               atmel_qspi_write(iar, aq, QSPI_IAR);
                atmel_qspi_write(icr, aq, QSPI_ICR);
-               atmel_qspi_write(ifr, aq, QSPI_IFR);
        }
 
+       atmel_qspi_write(ifr, aq, QSPI_IFR);
+
        return 0;
 }
 
-- 
2.39.5