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@dsn.okisemi.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 0 insertions, 7 deletions

diff --git a/drivers/dma/pch_dma.c b/drivers/dma/pch_dma.c
index afd6fba08a6f..4e4667204061 100644
--- a/drivers/dma/pch_dma.c
+++ b/drivers/dma/pch_dma.c
@@ -254,9 +254,6 @@ 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");
@@ -282,10 +279,6 @@ 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,