Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux...

[firefly-linux-kernel-4.4.55.git] / arch / blackfin / mach-bf561 / hotplug.c

diff --git a/arch/blackfin/mach-bf561/hotplug.c b/arch/blackfin/mach-bf561/hotplug.c
index 42fc085629c7693d43789f6a7c248503c81f6089..0123117b8ff2c88c876963202a0bd02cf4a0f318 100644 (file)
--- a/arch/blackfin/mach-bf561/hotplug.c
+++ b/arch/blackfin/mach-bf561/hotplug.c
@@ -7,6 +7,7 @@
 
 #include <linux/smp.h>
 #include <asm/blackfin.h>
+#include <asm/cacheflush.h>
 #include <mach/pll.h>
 
 int hotplug_coreb;
@@ -14,8 +15,16 @@ int hotplug_coreb;
 void platform_cpu_die(void)
 {
        unsigned long iwr;
+
        hotplug_coreb = 1;
 
+       /*
+        * When CoreB wakes up, the code in _coreb_trampoline_start cannot
+        * turn off the data cache. This causes the CoreB failed to boot.
+        * As a workaround, we invalidate all the data cache before sleep.
+        */
+       blackfin_invalidate_entire_dcache();
+
        /* disable core timer */
        bfin_write_TCNTL(0);