For some SPI controllers it's not possible to keep the CS active between
transfers and they are limited to a known number of bytes.
This splits spi_flash reads into different iterations in order to respect
the SPI controller limits.
Signed-off-by: Álvaro Fernández Rojas <nolt...@gmail.com>
Reviewed-by: Simon Glass <s...@chromium.org>
Reviewed-by: Daniel Schwierzeck <daniel.schwierz...@gmail.com>
---
v5: no changes
v4: no changes
v3: no changes
v2: no changes
drivers/mtd/spi/spi_flash.c | 3 +++
include/spi.h | 3 +++
2 files changed, 6 insertions(+)
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index 0034a28d5f..5ee33d8bb2 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -487,6 +487,9 @@ int spi_flash_cmd_read_ops(struct spi_flash *flash, u32
offset,
else
read_len = remain_len;
+ if (spi->max_read_size)
+ read_len = min(read_len, spi->max_read_size);
+
spi_flash_addr(read_addr, cmd);
ret = spi_flash_read_common(flash, cmd, cmdsz, data, read_len);
diff --git a/include/spi.h b/include/spi.h
index 8c4b882c54..d0fa5379ea 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -86,6 +86,8 @@ struct dm_spi_slave_platdata {
* @cs: ID of the chip select connected to the slave.
* @mode: SPI mode to use for this slave (see SPI mode flags)
* @wordlen: Size of SPI word in number of bits
+ * @max_read_size: If non-zero, the maximum number of bytes which can
+ * be read at once.
* @max_write_size: If non-zero, the maximum number of bytes which can
* be written at once, excluding command bytes.
* @memory_map: Address of read-only SPI flash access.
@@ -102,6 +104,7 @@ struct spi_slave {
#endif
uint mode;
unsigned int wordlen;
+ unsigned int max_read_size;
unsigned int max_write_size;
void *memory_map;
u8 option;
--
2.11.0
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
https://lists.denx.de/listinfo/u-boot
