[U-Boot] [PATCH v3] xyz-modem: Fix timeout loop waiting with WATCHDOG

[Lokesh Vutla]

Commit 2c77c0d6524eb ("xyz-modem: Change getc timeout loop waiting")
fixes the loop delay when using a hw watchdog, assuming that watchdog
kicking is taken care of by getc(). But the xyzmodem driver tries to
do a getc only after confirming that a character is available like below:
	while (!tstc()) {
		till timeout;
	}
	if (tstc())
		*c = getc();

and getc() does a watchdog reset only if it fails to see a character.
In this case, getc() always sees a character and never does a
watchdog reset. So to make sure that watchdog doesn't get reset
while loading the file, do a watchdog reset just before starting the
image loading.

Signed-off-by: Lokesh Vutla <lokeshvutla at ti.com>
Signed-off-by: Vignesh R <vigneshr at ti.com>
---
- This fixes uart boot on am335x-evm.
Changes since v2:
- Updated commit message.

 common/xyzModem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/common/xyzModem.c b/common/xyzModem.c
index e5c65b480a..e85da74a69 100644
--- a/common/xyzModem.c
+++ b/common/xyzModem.c
@@ -25,6 +25,7 @@
 #include <xyzModem.h>
 #include <stdarg.h>
 #include <u-boot/crc.h>
+#include <watchdog.h>
 
 /* Assumption - run xyzModem protocol over the console port */
 
@@ -63,6 +64,7 @@ CYGACC_COMM_IF_GETC_TIMEOUT (char chan, char *c)
 {
 
   ulong now = get_timer(0);
+  WATCHDOG_RESET();
   while (!tstc ())
     {
       if (get_timer(now) > xyzModem_CHAR_TIMEOUT)
-- 
2.19.2