Patch "dmaengine: ti-dma-crossbar: Fix event mapping for TPCC_EVT_MUX_60_63" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

dmaengine: ti-dma-crossbar: Fix event mapping for TPCC_EVT_MUX_60_63

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
dmaengine-ti-dma-crossbar-fix-event-mapping-for-tpcc_evt_mux_60_63.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Vignesh R <[email protected]>
Date: Tue, 19 Dec 2017 12:51:16 +0200
Subject: dmaengine: ti-dma-crossbar: Fix event mapping for TPCC_EVT_MUX_60_63

From: Vignesh R <[email protected]>

[ Upstream commit d087f15786021a9605b20f4c678312510be4cac1 ]

Register layout of a typical TPCC_EVT_MUX_M_N register is such that the lowest numbered event is at the lowest byte address and highest numbered event at highest byte address. But TPCC_EVT_MUX_60_63 register layout is different, in that the lowest numbered event is at the highest address and highest numbered event is at the lowest address. Therefore, modify ti_am335x_xbar_write() to handle TPCC_EVT_MUX_60_63 register accordingly.

---
 drivers/dma/ti-dma-crossbar.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

@@ -54,7 +54,15 @@ struct ti_am335x_xbar_map {
 
 static inline void ti_am335x_xbar_write(void __iomem *iomem, int event, u8 val)
 {
-	writeb_relaxed(val, iomem + event);
+	/*
+	 * TPCC_EVT_MUX_60_63 register layout is different than the
+	 * rest, in the sense, that event 63 is mapped to lowest byte
+	 * and event 60 is mapped to highest, handle it separately.
+	 */
+	if (event >= 60 && event <= 63)
+		writeb_relaxed(val, iomem + (63 - event % 4));
+	else
+		writeb_relaxed(val, iomem + event);
 }
 
 static void ti_am335x_xbar_free(struct device *dev, void *route_data)

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/dmaengine-ti-dma-crossbar-fix-event-mapping-for-tpcc_evt_mux_60_63.patch