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spi: spi-mem: Extend spi_mem_adjust_op_size() to honor max xfer size

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Extend spi_mem_adjust_op_size() to take spi->max_write_size and
spi->max_read_size into account.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Tested-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Tested-by: Stefan Roese <sr@denx.de>
Tested-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com> #zynq-microzed
This commit is contained in:
Vignesh R 2019-02-05 11:29:13 +05:30 committed by Jagan Teki
parent 6d373e523f
commit 12563f768e
1 changed files with 19 additions and 0 deletions
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19
drivers/spi/spi-mem.c
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@ -412,6 +412,25 @@ int spi_mem_adjust_op_size(struct spi_slave *slave, struct spi_mem_op *op)
if (ops->mem_ops && ops->mem_ops->adjust_op_size)
return ops->mem_ops->adjust_op_size(slave, op);
if (!ops->mem_ops || !ops->mem_ops->exec_op) {
unsigned int len;
len = sizeof(op->cmd.opcode) + op->addr.nbytes +
op->dummy.nbytes;
if (slave->max_write_size && len > slave->max_write_size)
return -EINVAL;
if (op->data.dir == SPI_MEM_DATA_IN && slave->max_read_size)
op->data.nbytes = min(op->data.nbytes,
slave->max_read_size);
else if (slave->max_write_size)
op->data.nbytes = min(op->data.nbytes,
slave->max_write_size - len);
if (!op->data.nbytes)
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL_GPL(spi_mem_adjust_op_size);