spi: cadence-qspi: Make sure we filter out unsupported ops

The Cadence driver does not support anything else than repeating the
command opcode twice while in octal DTR mode. Make this clear by
checking for this in the ->supports_op() hook.

Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Miquel Raynal (Schneider Electric) <miquel.raynal@bootlin.com>
Tested-by: Santhosh Kumar K <s-k6@ti.com>
Link: https://patch.msgid.link/20260122-schneider-6-19-rc1-qspi-v4-7-f9c21419a3e6@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index a8437d9c37a79ed588ddd4900328acabf16e1f10..38518475858da177ee4cbc0984a5c0d859cfec65 100644 (file)
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -1531,6 +1531,10 @@ static bool cqspi_supports_mem_op(struct spi_mem *mem,
                        return false;
                if (op->data.nbytes && op->data.buswidth != 8)
                        return false;
+
+               /* A single opcode is supported, it will be repeated */
+               if ((op->cmd.opcode >> 8) != (op->cmd.opcode & 0xFF))
+                       return false;
        } else if (!all_false) {
                /* Mixed DTR modes are not supported. */
                return false;