[PATCH] powerpc: Enable coherency for all pages on 83xx to fix PCI data corruption

On the 83xx platform to ensure the PCI inbound memory is handled properly we
have to turn on coherency for all pages in the MMU.  Otherwise we see
corruption if inbound "prefetching/streaming" is enabled on the PCI controller.

Signed-off-by: Randy Vinson <rvinson@mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 6 insertions, 3 deletions

diff --git a/include/asm-powerpc/cputable.h b/include/asm-powerpc/cputable.h
index 64210549f56b..90d005bb4d1c 100644
--- a/include/asm-powerpc/cputable.h
+++ b/include/asm-powerpc/cputable.h
@@ -159,9 +159,11 @@ extern void do_cpu_ftr_fixups(unsigned long offset);
 #endif
 
 /* We need to mark all pages as being coherent if we're SMP or we
- * have a 74[45]x and an MPC107 host bridge.
+ * have a 74[45]x and an MPC107 host bridge. Also 83xx requires
+ * it for PCI "streaming/prefetch" to work properly.
  */
-#if defined(CONFIG_SMP) || defined(CONFIG_MPC10X_BRIDGE)
+#if defined(CONFIG_SMP) || defined(CONFIG_MPC10X_BRIDGE) \
+        || defined(CONFIG_PPC_83xx)
 #define CPU_FTR_COMMON                  CPU_FTR_NEED_COHERENT
 #else
 #define CPU_FTR_COMMON                  0
@@ -277,7 +279,8 @@ enum {
         CPU_FTRS_G2_LE = CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_MAYBE_CAN_DOZE |
             CPU_FTR_USE_TB | CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_HAS_HIGH_BATS,
         CPU_FTRS_E300 = CPU_FTR_SPLIT_ID_CACHE | CPU_FTR_MAYBE_CAN_DOZE |
-            CPU_FTR_USE_TB | CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_HAS_HIGH_BATS,
+            CPU_FTR_USE_TB | CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_HAS_HIGH_BATS |
+            CPU_FTR_COMMON,
         CPU_FTRS_CLASSIC32 = CPU_FTR_COMMON | CPU_FTR_SPLIT_ID_CACHE |
             CPU_FTR_USE_TB | CPU_FTR_HPTE_TABLE,
         CPU_FTRS_POWER3_32 = CPU_FTR_COMMON | CPU_FTR_SPLIT_ID_CACHE |