linux-kernel - [PATCH] dmaengine: dw: fix cyclic transfers

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Message-Id: <1452459243-23739-1-git-send-email-mans@mansr.com>
Date:	Sun, 10 Jan 2016 20:54:03 +0000
From:	Mans Rullgard <mans@...sr.com>
To:	Viresh Kumar <vireshk@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] dmaengine: dw: fix cyclic transfers

Commit 61e183f83069 ("dmaengine/dw_dmac: Reconfigure interrupt and
chan_cfg register on resume") moved some channel initialisation to
a new function which must be called before starting a transfer.

This adds the necessary dwc_initialize() call to dw_dma_cyclic_start()
which was missed in the original commit.

Fixes: 61e183f83069 ("dmaengine/dw_dmac: Reconfigure interrupt and chan_cfg register on resume")
Signed-off-by: Mans Rullgard <mans@...sr.com>
---
Andy, do you want to collect this with your other patches?  It's trivial
enough that it can go in separately without conflicts too.
---
 drivers/dma/dw/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index 7067b6ddc1db..2917f75b67b4 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -1265,6 +1265,8 @@ int dw_dma_cyclic_start(struct dma_chan *chan)
 		return -EBUSY;
 	}
 
+	dwc_initialize(dwc);
+
 	dma_writel(dw, CLEAR.ERROR, dwc->mask);
 	dma_writel(dw, CLEAR.XFER, dwc->mask);
 
-- 
2.7.0