microblaze: Do not use PVR configuration for broken MB version

Signed-off-by: Michal Simek <monstr@monstr.eu>

2 files changed, 8 insertions, 3 deletions

diff --git a/arch/microblaze/kernel/cpu/cpuinfo-pvr-full.c b/arch/microblaze/kernel/cpu/cpuinfo-pvr-full.c
index cf7424a6bb87..153f57c57b6d 100644
--- a/arch/microblaze/kernel/cpu/cpuinfo-pvr-full.c
+++ b/arch/microblaze/kernel/cpu/cpuinfo-pvr-full.c
@@ -30,6 +30,13 @@ void set_cpuinfo_pvr_full(struct cpuinfo *ci, struct device_node *cpu)
         int temp; /* for saving temp value */
         get_pvr(&pvr);
 
+        CI(ver_code, VERSION);
+        if (!ci->ver_code) {
+                printk(KERN_ERR "ERROR: MB has broken PVR regs "
+                                                "-> use DTS setting\n");
+                return;
+        }
+
         temp = PVR_USE_BARREL(pvr) | PVR_USE_MSR_INSTR(pvr) |\
                 PVR_USE_PCMP_INSTR(pvr) | PVR_USE_DIV(pvr);
         if (ci->use_instr != temp)
@@ -60,8 +67,6 @@ void set_cpuinfo_pvr_full(struct cpuinfo *ci, struct device_node *cpu)
 
         CI(mmu, USE_MMU);
 
-        CI(ver_code, VERSION);
-
         CI(use_icache, USE_ICACHE);
         CI(icache_tagbits, ICACHE_ADDR_TAG_BITS);
         CI(icache_write, ICACHE_ALLOW_WR);
diff --git a/arch/microblaze/kernel/cpu/cpuinfo.c b/arch/microblaze/kernel/cpu/cpuinfo.c
index 4a740dfcf6da..a10bea119b94 100644
--- a/arch/microblaze/kernel/cpu/cpuinfo.c
+++ b/arch/microblaze/kernel/cpu/cpuinfo.c
@@ -71,7 +71,7 @@ void __init setup_cpuinfo(void)
                         __func__);
                 set_cpuinfo_static(&cpuinfo, cpu);
                 break;
-/* FIXME I found weird behavior with MB 7.00.a/b
+/* FIXME I found weird behavior with MB 7.00.a/b 7.10.a
  * please do not use FULL PVR with MMU */
         case 1:
                 printk(KERN_INFO "%s: Using full CPU PVR support\n",