[PATCH v3 04/11] spi: airoha: return an error for continuous mode dirmap creation cases

[Mikhail Kshevetskiy]

This driver can accelerate single page operations only, thus
continuous reading mode should not be used.

Continuous reading will use sizes up to the size of one erase block.
This size is much larger than the size of single flash page. Use this
difference to identify continuous reading and return an error.

Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu>
---
 drivers/spi/airoha_snfi_spi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/spi/airoha_snfi_spi.c b/drivers/spi/airoha_snfi_spi.c
index f72d11f5b19..bec4ec0bf00 100644
--- a/drivers/spi/airoha_snfi_spi.c
+++ b/drivers/spi/airoha_snfi_spi.c
@@ -630,6 +630,10 @@ static int airoha_snand_dirmap_create(struct spi_mem_dirmap_desc *desc)
 	if (desc->info.offset + desc->info.length > U32_MAX)
 		return -EINVAL;
 
+	/* continuous reading is not supported */
+	if (desc->info.length > SPI_NAND_CACHE_SIZE)
+		return -E2BIG;
+
 	if (!airoha_snand_supports_op(desc->slave, &desc->info.op_tmpl))
 		return -EOPNOTSUPP;
 
-- 
2.51.0