commit 1601ba4d1e9711e9259ea563b3a2ee1c7c4b3f36
author Fabio Estevam <fabio.estevam@freescale.com> Wed Sep 11 18:14:29 2013 -0300
committer Stefano Babic <sbabic@denx.de> Fri Sep 20 17:55:36 2013 +0200
tree e319eba6c6df5c34a0687176c01ca71b8170e020
parent b4c927b33d520102deb19c318986695a8b19b467

mx6sabresd: Avoid hang when HDMI cable is not connected

Since commit d9b894603 (mx6sabresd: Add LVDS splash screen support) the
following hang happens if the HDMI cable is not connected or the 'panel'
variable is not set:

U-Boot 2013.10-rc2-12978-g47ac53d-dirty (Sep 11 2013 - 15:07:38)

CPU:   Freescale i.MX6Q rev1.2 at 792 MHz
Reset cause: POR
Board: MX6-SabreSD
DRAM:  1 GiB
MMC:   FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
...

Provide a check to 'dev->detect' in order to prevent the hang.

Reported-by: Pardeep Kumar Singla <b45784@freescale.com>
Suggested-by: Eric Bénard <eric@eukrea.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

board/freescale/mx6sabresd/mx6sabresd.c

diff --git a/board/freescale/mx6sabresd/mx6sabresd.c b/board/freescale/mx6sabresd/mx6sabresd.c
index c832bd9..0f91fe2 100644
--- a/board/freescale/mx6sabresd/mx6sabresd.c
+++ b/board/freescale/mx6sabresd/mx6sabresd.c
@@ -313,7 +313,7 @@
 	if (!panel) {
 		for (i = 0; i < ARRAY_SIZE(displays); i++) {
 			struct display_info_t const *dev = displays+i;
-			if (dev->detect(dev)) {
+			if (dev->detect && dev->detect(dev)) {
 				panel = dev->mode.name;
 				printf("auto-detected panel %s\n", panel);
 				break;