powerpc/hvsi: Increase handshake timeout from 200ms to 400ms.

This solves a problem observed in kexec'ed kernel where 200ms timeout is
too short and bootconsole fails to initialize. Console did eventually
become workable but much later into the boot process.

Observed timeout was around 260ms, but I decided to make it a little bigger
for more reliability.

This has been tested on Power7 machine with Petitboot as a primary
bootloader and PowerNV firmware.

CC: <stable@vger.kernel.org>
Signed-off-by: Eugene Surovegin <surovegin@google.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/drivers/tty/hvc/hvsi_lib.c b/drivers/tty/hvc/hvsi_lib.c
index 3396eb9d57a374770f22dd956d06fa3382196f66..ac2767100df56d3ef071f565ddfc7f4063432ca7 100644 (file)
--- a/drivers/tty/hvc/hvsi_lib.c
+++ b/drivers/tty/hvc/hvsi_lib.c
@@ -341,8 +341,8 @@ void hvsilib_establish(struct hvsi_priv *pv)
 
        pr_devel("HVSI@%x:   ... waiting handshake\n", pv->termno);
 
-       /* Try for up to 200s */
-       for (timeout = 0; timeout < 20; timeout++) {
+       /* Try for up to 400ms */
+       for (timeout = 0; timeout < 40; timeout++) {
                if (pv->established)
                        goto established;
                if (!hvsi_get_packet(pv))