Merge branch 'fixes' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur...

[pandora-kernel.git] / arch / arm / Kconfig

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 44789ef..e084b7e 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1231,7 +1231,7 @@ config ARM_ERRATA_742231
          capabilities of the processor.
 
 config PL310_ERRATA_588369
-       bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
+       bool "PL310 errata: Clean & Invalidate maintenance operations do not invalidate clean lines"
        depends on CACHE_L2X0
        help
           The PL310 L2 cache controller implements three types of Clean &
@@ -1256,7 +1256,7 @@ config ARM_ERRATA_720789
          entries regardless of the ASID.
 
 config PL310_ERRATA_727915
-       bool "Background Clean & Invalidate by Way operation can cause data corruption"
+       bool "PL310 errata: Background Clean & Invalidate by Way operation can cause data corruption"
        depends on CACHE_L2X0
        help
          PL310 implements the Clean & Invalidate by Way L2 cache maintenance
@@ -1289,8 +1289,8 @@ config ARM_ERRATA_751472
          operation is received by a CPU before the ICIALLUIS has completed,
          potentially leading to corrupted entries in the cache or TLB.
 
-config ARM_ERRATA_753970
-       bool "ARM errata: cache sync operation may be faulty"
+config PL310_ERRATA_753970
+       bool "PL310 errata: cache sync operation may be faulty"
        depends on CACHE_PL310
        help
          This option enables the workaround for the 753970 PL310 (r3p0) erratum.
@@ -1352,6 +1352,18 @@ config ARM_ERRATA_764369
          relevant cache maintenance functions and sets a specific bit
          in the diagnostic control register of the SCU.
 
+config PL310_ERRATA_769419
+       bool "PL310 errata: no automatic Store Buffer drain"
+       depends on CACHE_L2X0
+       help
+         On revisions of the PL310 prior to r3p2, the Store Buffer does
+         not automatically drain. This can cause normal, non-cacheable
+         writes to be retained when the memory system is idle, leading
+         to suboptimal I/O performance for drivers using coherent DMA.
+         This option adds a write barrier to the cpu_idle loop so that,
+         on systems with an outer cache, the store buffer is drained
+         explicitly.
+
 endmenu
 
 source "arch/arm/common/Kconfig"