Commit c3d4913c authored by Tomoya MORINAGA's avatar Tomoya MORINAGA Committed by Vinod Koul
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pch_dma: fix DMA issue(ch8-ch11) 



ISSUE: In case PCH_DMA with I2S communications with ch8~ch11, sometimes I2S data
is not send correctly.
CAUSE: The following patch I submitted before was not enough modification for
supporting DMA ch8~ch11. The modification for status register of ch8~11 was not
enough.

pch_dma: Support I2S for ML7213 IOH
author	Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
	Mon, 9 May 2011 07:09:38 +0000 (16:09 +0900)
committer	Vinod Koul <vinod.koul@intel.com>
	Mon, 9 May 2011 11:42:23 +0000 (16:42 +0530)
commit	194f5f27
tree	c9d4903ea02b18939a4f390956a48be1a3734517
parent	60092d0b

This patch fixes the issue.
We can confirm PCH_DMA with I2S communications with ch8~ch11 works well.

Signed-off-by: default avatarTomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 55922c9d

drivers/dma/pch_dma.c

+55 −14
Original line number Diff line number Diff line
@@ -45,7 +45,8 @@ 
#define DMA_STATUS_MASK_BITS		0x3

#define DMA_STATUS_SHIFT_BITS		16

#define DMA_STATUS_IRQ(x)		(0x1 << (x))

#define DMA_STATUS_ERR(x)		(0x1 << ((x) + 8))

#define DMA_STATUS0_ERR(x)		(0x1 << ((x) + 8))

#define DMA_STATUS2_ERR(x)		(0x1 << (x))



#define DMA_DESC_WIDTH_SHIFT_BITS	12

#define DMA_DESC_WIDTH_1_BYTE		(0x3 << DMA_DESC_WIDTH_SHIFT_BITS)
@@ -133,6 +134,7 @@ struct pch_dma { 
#define PCH_DMA_CTL3	0x0C

#define PCH_DMA_STS0	0x10

#define PCH_DMA_STS1	0x14

#define PCH_DMA_STS2	0x18



#define dma_readl(pd, name) \

	readl((pd)->membase + PCH_DMA_##name)
@@ -183,13 +185,19 @@ static void pdc_enable_irq(struct dma_chan *chan, int enable) 
{

	struct pch_dma *pd = to_pd(chan->device);

	u32 val;

	int pos;



	if (chan->chan_id < 8)

		pos = chan->chan_id;

	else

		pos = chan->chan_id + 8;



	val = dma_readl(pd, CTL2);



	if (enable)

		val |= 0x1 << chan->chan_id;

		val |= 0x1 << pos;

	else

		val &= ~(0x1 << chan->chan_id);

		val &= ~(0x1 << pos);



	dma_writel(pd, CTL2, val);
@@ -262,7 +270,7 @@ static void pdc_set_mode(struct dma_chan *chan, u32 mode) 
		chan->chan_id, val);

}



static u32 pdc_get_status(struct pch_dma_chan *pd_chan)

static u32 pdc_get_status0(struct pch_dma_chan *pd_chan)

{

	struct pch_dma *pd = to_pd(pd_chan->chan.device);

	u32 val;
@@ -272,9 +280,27 @@ static u32 pdc_get_status(struct pch_dma_chan *pd_chan) 
			DMA_STATUS_BITS_PER_CH * pd_chan->chan.chan_id));

}



static u32 pdc_get_status2(struct pch_dma_chan *pd_chan)

{

	struct pch_dma *pd = to_pd(pd_chan->chan.device);

	u32 val;



	val = dma_readl(pd, STS2);

	return DMA_STATUS_MASK_BITS & (val >> (DMA_STATUS_SHIFT_BITS +

			DMA_STATUS_BITS_PER_CH * (pd_chan->chan.chan_id - 8)));

}



static bool pdc_is_idle(struct pch_dma_chan *pd_chan)

{

	if (pdc_get_status(pd_chan) == DMA_STATUS_IDLE)

	u32 sts;



	if (pd_chan->chan.chan_id < 8)

		sts = pdc_get_status0(pd_chan);

	else

		sts = pdc_get_status2(pd_chan);





	if (sts == DMA_STATUS_IDLE)

		return true;

	else

		return false;
@@ -693,30 +719,45 @@ static irqreturn_t pd_irq(int irq, void *devid) 
	struct pch_dma *pd = (struct pch_dma *)devid;

	struct pch_dma_chan *pd_chan;

	u32 sts0;

	u32 sts2;

	int i;

	int ret = IRQ_NONE;

	int ret0 = IRQ_NONE;

	int ret2 = IRQ_NONE;



	sts0 = dma_readl(pd, STS0);

	sts2 = dma_readl(pd, STS2);



	dev_dbg(pd->dma.dev, "pd_irq sts0: %x\n", sts0);



	for (i = 0; i < pd->dma.chancnt; i++) {

		pd_chan = &pd->channels[i];



		if (i < 8) {

			if (sts0 & DMA_STATUS_IRQ(i)) {

			if (sts0 & DMA_STATUS_ERR(i))

				if (sts0 & DMA_STATUS0_ERR(i))

					set_bit(0, &pd_chan->err_status);



				tasklet_schedule(&pd_chan->tasklet);

			ret = IRQ_HANDLED;

				ret0 = IRQ_HANDLED;

			}

		} else {

			if (sts2 & DMA_STATUS_IRQ(i - 8)) {

				if (sts2 & DMA_STATUS2_ERR(i))

					set_bit(0, &pd_chan->err_status);



				tasklet_schedule(&pd_chan->tasklet);

				ret2 = IRQ_HANDLED;

			}

		}

	}



	/* clear interrupt bits in status register */

	if (ret0)

		dma_writel(pd, STS0, sts0);

	if (ret2)

		dma_writel(pd, STS2, sts2);



	return ret;

	return ret0 | ret2;

}



#ifdef	CONFIG_PM

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