linux-kernel - [PATCH] dmaengine/ste_dma40: clear LNK on channel startup

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Date:	Wed, 28 Dec 2011 11:27:40 +0530
From:	Narayanan G <narayanan.gopalakrishnan@...ricsson.com>
To:	<linux-kernel@...r.kernel.org>, Vinod Koul <vinod.koul@...el.com>
Cc:	<linus.walleij@...ricsson.com>,
	Rabin Vincent <rabin.vincent@...ricsson.com>,
	Narayanan G <narayanan.gopalakrishnan@...ricsson.com>
Subject: [PATCH] dmaengine/ste_dma40: clear LNK on channel startup

From: Rabin Vincent <rabin.vincent@...ricsson.com>

Otherwise if a previously physical channel is used as a logical channel, the
LNK may have old values which affect the operation of the logical channel since
the LNK register has different semantics between physical and logical channels.

Signed-off-by: Rabin Vincent <rabin.vincent@...ricsson.com>
Reviewed-by: Jonas ABERG <jonas.aberg@...ricsson.com>
Signed-off-by: Narayanan G <narayanan.gopalakrishnan@...ricsson.com>
---
 drivers/dma/ste_dma40.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 972dc35..cc5ecbc
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -1104,6 +1104,10 @@ static void d40_config_write(struct d40_chan *d40c)
 		/* Set LIDX for lcla */
 		writel(lidx, chanbase + D40_CHAN_REG_SSELT);
 		writel(lidx, chanbase + D40_CHAN_REG_SDELT);
+
+		/* Clear LNK which will be used by d40_chan_has_events() */
+		writel(0, chanbase + D40_CHAN_REG_SSLNK);
+		writel(0, chanbase + D40_CHAN_REG_SDLNK);
 	}
 }
 
-- 
1.7.4.3

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