Merge tag 'mvebu-fixes-3.19-4' of git://git.infradead.org/linux-mvebu into fixes

Merge "mvebu/fixes #3" from Andrew Lunn:

mvebu fixes for 3.19. (Part 4)

bus: mvebu-mbus: fix support of MBus window 13

* tag 'mvebu-fixes-3.19-4' of git://git.infradead.org/linux-mvebu:
  bus: mvebu-mbus: fix support of MBus window 13
  ARM: mvebu: completely disable hardware I/O coherency

Signed-off-by: Olof Johansson <olof@lixom.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index eb7682dc123b..81bf297f1034 100644
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -210,12 +210,25 @@ static void mvebu_mbus_disable_window(struct mvebu_mbus_state *mbus,
 }
 
 /* Checks whether the given window number is available */
+
+/* On Armada XP, 375 and 38x the MBus window 13 has the remap
+ * capability, like windows 0 to 7. However, the mvebu-mbus driver
+ * isn't currently taking into account this special case, which means
+ * that when window 13 is actually used, the remap registers are left
+ * to 0, making the device using this MBus window unavailable. The
+ * quick fix for stable is to not use window 13. A follow up patch
+ * will correctly handle this window.
+*/
 static int mvebu_mbus_window_is_free(struct mvebu_mbus_state *mbus,
                                      const int win)
 {
         void __iomem *addr = mbus->mbuswins_base +
                 mbus->soc->win_cfg_offset(win);
         u32 ctrl = readl(addr + WIN_CTRL_OFF);
+
+        if (win == 13)
+                return false;
+
         return !(ctrl & WIN_CTRL_ENABLE);
 }