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authorDoug Anderson <dianders@chromium.org>2013-06-05 13:56:33 -0700
committerOlof Johansson <olof@lixom.net>2013-06-07 18:12:00 -0700
commit9c1fcdccc7ce5611ec1edf45dbbe51b10e333bd3 (patch)
treeecc6760a64b282615c38cdd4f53276e0520e230a /arch
parentfb565ff7c885893dd33ba48f730d32b50aa350ea (diff)
downloadvexpress-lsk-9c1fcdccc7ce5611ec1edf45dbbe51b10e333bd3.tar.gz
ARM: exynos: add debug_ll_io_init() call in exynos_init_io()
If the early MMU mapping of the UART happens to get booted out of the TLB between the start of paging_init() and when we finally re-add the UART at the very end of s3c_init_cpu(), we'll get a hang at bootup if we've got early_printk enabled. Avoid this hang by calling debug_ll_io_init() early. Without this patch, you can reliably reproduce a hang when early printk is enabled by adding flush_tlb_all() at the start of exynos_init_io(). After this patch the hang goes away. Signed-off-by: Doug Anderson <dianders@chromium.org> Acked-by: Kukjin Kim <kgene.kim@samsung.com> Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-exynos/common.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
index 027c9e7f0d1..f7e504b7874 100644
--- a/arch/arm/mach-exynos/common.c
+++ b/arch/arm/mach-exynos/common.c
@@ -386,6 +386,8 @@ int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
void __init exynos_init_io(struct map_desc *mach_desc, int size)
{
+ debug_ll_io_init();
+
#ifdef CONFIG_OF
if (initial_boot_params)
of_scan_flat_dt(exynos_fdt_map_chipid, NULL);