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Date: Wed, 01 Jun 2011 13:27:17 +0530
From: "Koul, Vinod" <vinod.koul@...el.com>
To: Tomoya MORINAGA <tomoya-linux@....okisemi.com>
Cc: Dan Williams <dan.j.williams@...el.com>,
linux-kernel@...r.kernel.org, qi.wang@...el.com,
yong.y.wang@...el.com, joel.clark@...el.com,
kok.howg.ewe@...el.com, toshiharu-linux@....okisemi.com
Subject: Re: [PATCH] pch_dma: fix DMA issue(ch8-ch11)
On Tue, 2011-05-31 at 10:34 +0900, Tomoya MORINAGA wrote:
> 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@....okisemi.com>
> Mon, 9 May 2011 07:09:38 +0000 (16:09 +0900)
> committer Vinod Koul <vinod.koul@...el.com>
> Mon, 9 May 2011 11:42:23 +0000 (16:42 +0530)
> commit 194f5f2706c7472f9c6bb2d17fa788993606581f
> tree c9d4903ea02b18939a4f390956a48be1a3734517
> parent 60092d0bde4c8741198da4a69b693d3709385bf1
>
> This patch fixes the issue.
> We can confirm PCH_DMA with I2S communications with ch8~ch11 works well.
>
> Signed-off-by: Tomoya MORINAGA <tomoya-linux@....okisemi.com>
> ---
> drivers/dma/pch_dma.c | 69 +++++++++++++++++++++++++++++++++++++++----------
> 1 files changed, 55 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/dma/pch_dma.c b/drivers/dma/pch_dma.c
> index ff5b38f..65c32f8 100644
> --- a/drivers/dma/pch_dma.c
> +++ b/drivers/dma/pch_dma.c
> @@ -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 (sts0 & DMA_STATUS_IRQ(i)) {
> - if (sts0 & DMA_STATUS_ERR(i))
> - set_bit(0, &pd_chan->err_status);
> + if (i < 8) {
> + if (sts0 & DMA_STATUS_IRQ(i)) {
> + if (sts0 & DMA_STATUS0_ERR(i))
> + set_bit(0, &pd_chan->err_status);
>
> - tasklet_schedule(&pd_chan->tasklet);
> - ret = IRQ_HANDLED;
> - }
> + tasklet_schedule(&pd_chan->tasklet);
> + 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 */
> - dma_writel(pd, STS0, sts0);
> + if (ret0)
> + dma_writel(pd, STS0, sts0);
> + if (ret2)
> + dma_writel(pd, STS2, sts2);
>
> - return ret;
> + return ret0 | ret2;
> }
>
> #ifdef CONFIG_PM
Applied Thanks
--
~Vinod
--
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