[PATCH u-boot-marvell 15/29] tools: kwboot: Allow greater timeout when executing header code

["Marek Behún" <marek.behun@nic.cz>]

When executing header code (which contains U-Boot SPL in most cases),
wait 10s after every non-xmodem character received (i.e. printed by
U-Boot SPL) before timing out.

Sometimes DDR training, which runs in SPL, may be slow.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
---
 tools/kwboot.c | 44 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 41 insertions(+), 3 deletions(-)

diff --git a/tools/kwboot.c b/tools/kwboot.c
index 2e16db83fa..0e60cc8a70 100644
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -24,6 +24,7 @@
 #include <unistd.h>
 #include <stdint.h>
 #include <termios.h>
+#include <time.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 
@@ -68,6 +69,7 @@ struct kwboot_block {
 } __packed;
 
 #define KWBOOT_BLK_RSP_TIMEO 1000 /* ms */
+#define KWBOOT_HDR_RSP_TIMEO 10000 /* ms */
 
 static int kwboot_verbose;
 
@@ -381,12 +383,35 @@ _is_xm_reply(char c)
 	return c == ACK || c == NAK || c == CAN;
 }
 
+static uint64_t
+_now(void)
+{
+	struct timespec ts;
+
+	if (clock_gettime(CLOCK_MONOTONIC, &ts)) {
+		static int err_print;
+
+		if (!err_print) {
+			perror("clock_gettime() does not work");
+			err_print = 1;
+		}
+
+		/* this will just make the timeout not work */
+		return -1ULL;
+	}
+
+	return ts.tv_sec * 1000 + (ts.tv_nsec + 500000) / 1000000;
+}
+
 static int
 kwboot_xm_sendblock(int fd, struct kwboot_block *block, int allow_non_xm,
 		    int *done_print)
 {
+	int recv_timeo = allow_non_xm ? KWBOOT_HDR_RSP_TIMEO : blk_rsp_timeo;
 	int non_xm_print = 0;
+	uint64_t timeout = 0;
 	int rc, retries;
+	int err;
 	char c;
 
 	*done_print = 0;
@@ -404,14 +429,22 @@ kwboot_xm_sendblock(int fd, struct kwboot_block *block, int allow_non_xm,
 		}
 
 		do {
-			rc = kwboot_tty_recv(fd, &c, 1, blk_rsp_timeo);
+			err = 0;
+			rc = kwboot_tty_recv(fd, &c, 1, recv_timeo);
 			if (rc) {
-				if (errno != ETIMEDOUT)
+				if (errno != ETIMEDOUT) {
 					return rc;
-				c = NAK;
+				} else if (timeout && timeout < _now()) {
+					errno = ETIMEDOUT;
+					return -1;
+				} else {
+					err = errno;
+					c = NAK;
+				}
 			}
 
 			if (!_is_xm_reply(c) && allow_non_xm) {
+				timeout = _now() + recv_timeo;
 				putchar(c);
 				fflush(stdout);
 				non_xm_print = 1;
@@ -425,6 +458,11 @@ kwboot_xm_sendblock(int fd, struct kwboot_block *block, int allow_non_xm,
 	if (non_xm_print)
 		kwboot_printv("\n");
 
+	if (err) {
+		errno = err;
+		return -1;
+	}
+
 	rc = -1;
 
 	switch (c) {
-- 
2.31.1