linux-kernel - [PATCH v4 08/58] dmaengine: Add device_terminate

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Message-Id: <1414531573-18807-9-git-send-email-maxime.ripard@free-electrons.com>
Date:	Tue, 28 Oct 2014 22:25:23 +0100
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Vinod Koul <vinod.koul@...el.com>, dmaengine@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Antoine Ténart <antoine@...e-electrons.com>,
	Russell King <linux@....linux.org.uk>, lars@...afoo.de,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: [PATCH v4 08/58] dmaengine: Add device_terminate_all callback

Split out the terminate_all command from device_control to a dma_device
callback. In order to preserve backward capability, still rely on
device_control if no such callback has been implemented.

Eventually, this will allow to create a generic dma_slave_caps callback.

Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
---
 include/linux/dmaengine.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 4583c55f3355..b0efc805937a 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -615,6 +615,8 @@ struct dma_tx_state {
  *	0 or an error code
  * @device_resume: Resumes any transfer on a channel previously
  *	paused. Returns 0 or an error code
+ * @device_terminate_all: Aborts all transfers on a channel. Returns 0
+ *	or an error code
  * @device_tx_status: poll for transaction completion, the optional
  *	txstate parameter can be supplied with a pointer to get a
  *	struct with auxiliary transfer status information, otherwise the call
@@ -686,6 +688,7 @@ struct dma_device {
 		unsigned long arg);
 	int (*device_pause)(struct dma_chan *chan);
 	int (*device_resume)(struct dma_chan *chan);
+	int (*device_terminate_all)(struct dma_chan *chan);
 
 	enum dma_status (*device_tx_status)(struct dma_chan *chan,
 					    dma_cookie_t cookie,
@@ -795,6 +798,9 @@ static inline int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_cap
 
 static inline int dmaengine_terminate_all(struct dma_chan *chan)
 {
+	if (chan->device->device_terminate_all)
+		return chan->device->device_terminate_all(chan);
+
 	return dmaengine_device_control(chan, DMA_TERMINATE_ALL, 0);
 }
 
-- 
2.1.1

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