From: Rabin Vincent <rabin.vincent@stericsson.com>
Date: Wed, 28 Dec 2011 05:57:40 +0000 (+0530)
Subject: dmaengine/ste_dma40: clear LNK on channel startup
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=e9f3a49c9698da6f6b606d5e048ddce308438763;p=sagit-ice-cold%2Fkernel_xiaomi_msm8998.git

dmaengine/ste_dma40: clear LNK on channel startup

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@stericsson.com>
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>
Signed-off-by: Narayanan G <narayanan.gopalakrishnan@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
---

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 972dc35770f9..cc5ecbc067a3 100644
--- 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);
 	}
 }