Patch "net: mvpp2: set dma mask and coherent dma mask on PPv2.2" has been added to the 4.4-stable tree

Patch "net: mvpp2: set dma mask and coherent dma mask on PPv2.2" has been added to the 4.4-stable tree

[gregkh]

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

    net: mvpp2: set dma mask and coherent dma mask on PPv2.2

to the 4.4-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:
     net-mvpp2-set-dma-mask-and-coherent-dma-mask-on-ppv2.2.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Mar 19 09:58:12 CET 2018
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Tue, 7 Mar 2017 16:53:19 +0100
Subject: net: mvpp2: set dma mask and coherent dma mask on PPv2.2

From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>


[ Upstream commit 2067e0a13cfe0b1bdca7b91bc5e4f2740b07d478 ]

On PPv2.2, the streaming mappings can be anywhere in the first 40 bits
of the physical address space. However, for the coherent mappings, we
still need them to be in the first 32 bits of the address space,
because all BM pools share a single register to store the high 32 bits
of the BM pool address, which means all BM pools must be allocated in
the same 4GB memory area.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/marvell/mvpp2.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -6448,6 +6448,20 @@ static int mvpp2_probe(struct platform_d
 	/* Get system's tclk rate */
 	priv->tclk = clk_get_rate(priv->pp_clk);
 
+	if (priv->hw_version == MVPP22) {
+		err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(40));
+		if (err)
+			goto err_mg_clk;
+		/* Sadly, the BM pools all share the same register to
+		 * store the high 32 bits of their address. So they
+		 * must all have the same high 32 bits, which forces
+		 * us to restrict coherent memory to DMA_BIT_MASK(32).
+		 */
+		err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
+		if (err)
+			goto err_mg_clk;
+	}
+
 	/* Initialize network controller */
 	err = mvpp2_init(pdev, priv);
 	if (err < 0) {


Patches currently in stable-queue which might be from thomas.petazzoni@free-electrons.com are

queue-4.4/net-mvpp2-set-dma-mask-and-coherent-dma-mask-on-ppv2.2.patch