power: rk81x-battery: fix dwc_otg_check_dpdm declare error

[firefly-linux-kernel-4.4.55.git] / drivers / bus / mvebu-mbus.c

diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index 5dcc8305abd15680e16c517bbdeab1c6ea4bd29c..711dcf4a0313fc059e7991e2a93bf123b98a4693 100644 (file)
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -209,12 +209,25 @@ 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);
 }