linux-kernel - [PATCH 3/4] pch_dma: Fix DMA setting issue

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Message-Id: <1303812353-6712-3-git-send-email-tomoya-linux@dsn.okisemi.com>
Date:	Tue, 26 Apr 2011 19:05:52 +0900
From:	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
To:	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>, linux-kernel@...r.kernel.org
Cc:	qi.wang@...el.com, yong.y.wang@...el.com, joel.clark@...el.com,
	kok.howg.ewe@...el.com, toshiharu-linux@....okisemi.com,
	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
Subject: [PATCH 3/4] pch_dma: Fix DMA setting issue

Currently, Direct-Start mode(*) is enabled.
Our IOH's devices must not use this mode.
This causes unexpected behavior.
This patch deletes Direct-Start setting.
(*) This mode is used in order for CPU to generate the DMA request.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@....okisemi.com>
---
 drivers/dma/pch_dma.c |    7 -------
 1 files changed, 0 insertions(+), 7 deletions(-)

diff --git a/drivers/dma/pch_dma.c b/drivers/dma/pch_dma.c
index cd7bf83..35b6e80 100644
--- a/drivers/dma/pch_dma.c
+++ b/drivers/dma/pch_dma.c
@@ -262,9 +262,6 @@ static bool pdc_is_idle(struct pch_dma_chan *pd_chan)
 
 static void pdc_dostart(struct pch_dma_chan *pd_chan, struct pch_dma_desc* desc)
 {
-	struct pch_dma *pd = to_pd(pd_chan->chan.device);
-	u32 val;
-
 	if (!pdc_is_idle(pd_chan)) {
 		dev_err(chan2dev(&pd_chan->chan),
 			"BUG: Attempt to start non-idle channel\n");
@@ -290,10 +287,6 @@ static void pdc_dostart(struct pch_dma_chan *pd_chan, struct pch_dma_desc* desc)
 		channel_writel(pd_chan, NEXT, desc->txd.phys);
 		pdc_set_mode(&pd_chan->chan, DMA_CTL0_SG);
 	}
-
-	val = dma_readl(pd, CTL2);
-	val |= 1 << (DMA_CTL2_START_SHIFT_BITS + pd_chan->chan.chan_id);
-	dma_writel(pd, CTL2, val);
 }
 
 static void pdc_chain_complete(struct pch_dma_chan *pd_chan,
-- 
1.7.4

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