From ca341e98c8273e2ee74c489d6274740824c7b239 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Tue, 14 Sep 2021 05:26:51 +0200 Subject: [PATCH] dfu: dfu_sf: Read the SPI flash in 16 MiB chunks Not all SPI flashes and controllers can do continuous transfer longer than 16 MiB, so perform the DFU read in 16 MiB chunks. Signed-off-by: Marek Vasut Cc: Lukasz Majewski Reviewed-by: Lukasz Majewski --- drivers/dfu/dfu_sf.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/dfu/dfu_sf.c b/drivers/dfu/dfu_sf.c index 7e64ab7..b72493c 100644 --- a/drivers/dfu/dfu_sf.c +++ b/drivers/dfu/dfu_sf.c @@ -24,8 +24,18 @@ static int dfu_get_medium_size_sf(struct dfu_entity *dfu, u64 *size) static int dfu_read_medium_sf(struct dfu_entity *dfu, u64 offset, void *buf, long *len) { - return spi_flash_read(dfu->data.sf.dev, dfu->data.sf.start + offset, - *len, buf); + long seglen = *len; + int ret; + + if (seglen > (16 << 20)) + seglen = (16 << 20); + + ret = spi_flash_read(dfu->data.sf.dev, dfu->data.sf.start + offset, + seglen, buf); + if (!ret) + *len = seglen; + + return ret; } static u64 find_sector(struct dfu_entity *dfu, u64 start, u64 offset) -- 2.7.4