[S] Change in flashrom[1.2.x]: jlink_spi: Reduce transfer size

[Felix Singer (Code Review)]

Felix Singer has submitted this change. ( https://review.coreboot.org/c/flashrom/+/67872 )

Change subject: jlink_spi: Reduce transfer size
......................................................................

jlink_spi: Reduce transfer size

The maximum transfer size is too large for some devices and
results in an USB timeout.

Change-Id: If2c00b1524ec56740bdfe290096c3546cf375d73
Signed-off-by: Marc Schink 
Reviewed-on: https://review.coreboot.org/c/flashrom/+/48379
Tested-by: build bot (Jenkins) 
Reviewed-by: Miklós Márton 
Reviewed-by: Angel Pons 
Reviewed-on: https://review.coreboot.org/c/flashrom/+/67872
Reviewed-by: Felix Singer 
---
M jlink_spi.c
1 file changed, 20 insertions(+), 1 deletion(-)

Approvals:
  build bot (Jenkins): Verified
  Felix Singer: Looks good to me, approved
  Angel Pons: Looks good to me, approved

diff --git a/jlink_spi.c b/jlink_spi.c
index 8a69b41..00e9c6d 100644
--- a/jlink_spi.c
+++ b/jlink_spi.c
@@ -34,7 +34,7 @@
  * Maximum number of bytes that can be transferred at once via the JTAG
  * interface, see jaylink_jtag_io().
  */
-#define JTAG_MAX_TRANSFER_SIZE	(UINT16_MAX / 8)
+#define JTAG_MAX_TRANSFER_SIZE	(32768 / 8)

/*
  * Default base frequency in Hz. Used when the base frequency can not be