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-rw-r--r--drivers/fpga/fpga-mgr.c6
-rw-r--r--drivers/fpga/socfpga-a10.c1
2 files changed, 5 insertions, 2 deletions
diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
index 79ce2eea44db..f0a69d3e60a5 100644
--- a/drivers/fpga/fpga-mgr.c
+++ b/drivers/fpga/fpga-mgr.c
@@ -53,10 +53,12 @@ int fpga_mgr_buf_load(struct fpga_manager *mgr, struct fpga_image_info *info,
/*
* Call the low level driver's write_init function. This will do the
* device-specific things to get the FPGA into the state where it is
- * ready to receive an FPGA image.
+ * ready to receive an FPGA image. The low level driver only gets to
+ * see the first initial_header_size bytes in the buffer.
*/
mgr->state = FPGA_MGR_STATE_WRITE_INIT;
- ret = mgr->mops->write_init(mgr, info, buf, count);
+ ret = mgr->mops->write_init(mgr, info, buf,
+ min(mgr->mops->initial_header_size, count));
if (ret) {
dev_err(dev, "Error preparing FPGA for writing\n");
mgr->state = FPGA_MGR_STATE_WRITE_INIT_ERR;
diff --git a/drivers/fpga/socfpga-a10.c b/drivers/fpga/socfpga-a10.c
index ccd9fb23bd52..f8770af0f6b5 100644
--- a/drivers/fpga/socfpga-a10.c
+++ b/drivers/fpga/socfpga-a10.c
@@ -470,6 +470,7 @@ static enum fpga_mgr_states socfpga_a10_fpga_state(struct fpga_manager *mgr)
}
static const struct fpga_manager_ops socfpga_a10_fpga_mgr_ops = {
+ .initial_header_size = (RBF_DECOMPRESS_OFFSET + 1) * 4,
.state = socfpga_a10_fpga_state,
.write_init = socfpga_a10_fpga_write_init,
.write = socfpga_a10_fpga_write,