Extend spi_mem_adjust_op_size() to take spi->max_write_size and
spi->max_read_size into account.
Signed-off-by: Vignesh R <vigne...@ti.com>
Tested-by: Simon Goldschmidt <simon.k.r.goldschm...@gmail.com>
Tested-by: Stefan Roese <s...@denx.de>
Tested-by: Horatiu Vultur <horatiu.vul...@microchip.com>
---
drivers/spi/spi-mem.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index 1da20b8de5c4..334af682dc65 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -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);
--
2.20.1
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