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authorAndrew Lunn <andrew@lunn.ch>2015-01-18 09:46:10 -0600
committerAndrew Lunn <andrew@lunn.ch>2015-01-19 15:40:53 -0600
commit38bdf45f4aa5cb6186d50a29e6cbbd9d486a1519 (patch)
treea395aee611aedffb8de17a9451f0d9f570664b31
parent8f1e8ee28660018a935c7576b9af8ffe1feab54c (diff)
downloadlinux-38bdf45f4aa5cb6186d50a29e6cbbd9d486a1519.tar.gz
bus: mvebu-mbus: fix support of MBus window 13
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. As a minimal fix for stable, don't use window 13. A full fix will follow later. Fixes: fddddb52a6c ("bus: introduce an Marvell EBU MBus driver") Cc: <stable@vger.kernel.org> # v3.10+ Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Andrew Lunn <andrew@lunn.ch>
-rw-r--r--drivers/bus/mvebu-mbus.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index eb7682dc123..81bf297f103 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);
}