linux-kernel - [PATCH 4.9 049/119] dmaengine: mv_xor_v2: enable XOR engine after its configuration

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Message-Id: <20170612152600.030969516@linuxfoundation.org>
Date:   Mon, 12 Jun 2017 17:25:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hanna Hawa <hannah@...vell.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Vinod Koul <vinod.koul@...el.com>
Subject: [PATCH 4.9 049/119] dmaengine: mv_xor_v2: enable XOR engine after its configuration

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hanna Hawa <hannah@...vell.com>

commit ab2c5f0a77fe49bdb6e307b397496373cb47d2c2 upstream.

The engine was enabled prior to its configuration, which isn't
correct. This patch relocates the activation of the XOR engine, to be
after the configuration of the XOR engine.

Fixes: 19a340b1a820 ("dmaengine: mv_xor_v2: new driver")
Signed-off-by: Hanna Hawa <hannah@...vell.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/dma/mv_xor_v2.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/dma/mv_xor_v2.c
+++ b/drivers/dma/mv_xor_v2.c
@@ -653,9 +653,6 @@ static int mv_xor_v2_descq_init(struct m
 	writel((xor_dev->hw_desq & 0xFFFF00000000) >> 32,
 	       xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_BAHR_OFF);
 
-	/* enable the DMA engine */
-	writel(0, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_STOP_OFF);
-
 	/*
 	 * This is a temporary solution, until we activate the
 	 * SMMU. Set the attributes for reading & writing data buffers
@@ -699,6 +696,9 @@ static int mv_xor_v2_descq_init(struct m
 	reg |= MV_XOR_V2_GLOB_PAUSE_AXI_TIME_DIS_VAL;
 	writel(reg, xor_dev->glob_base + MV_XOR_V2_GLOB_PAUSE);
 
+	/* enable the DMA engine */
+	writel(0, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_STOP_OFF);
+
 	return 0;
 }