The designware spi driver doesn't support dual/quad/octal modes, but the driver still tries using these modes when it sees a capable flash chip in the devicetree. Add a supports_op function to this driver to prevent this from happening and force single lane operation.
Signed-off-by: Anirudh Srinivasan <[email protected]> --- drivers/spi/designware_spi.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/spi/designware_spi.c b/drivers/spi/designware_spi.c index 0df9a4f5abd..2f6dbeb1d94 100644 --- a/drivers/spi/designware_spi.c +++ b/drivers/spi/designware_spi.c @@ -694,8 +694,22 @@ static int dw_spi_adjust_op_size(struct spi_slave *slave, struct spi_mem_op *op) return 0; } +/* + * This driver only supports 1-1-1 transfers. Reject all other modes. + */ +static bool dw_spi_supports_op(struct spi_slave *slave, + const struct spi_mem_op *op) +{ + if (op->cmd.buswidth > 1 || op->addr.buswidth > 1 || + op->dummy.buswidth > 1 || op->data.buswidth > 1) + return false; + + return spi_mem_default_supports_op(slave, op); +} + static const struct spi_controller_mem_ops dw_spi_mem_ops = { .exec_op = dw_spi_exec_op, + .supports_op = dw_spi_supports_op, .adjust_op_size = dw_spi_adjust_op_size, }; -- 2.43.0
