linux-kernel - Re: [PATCH 7/7] dmaengine: sprd: Add interrupt support for 2-stage transfer

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Date:   Mon, 29 Apr 2019 20:11:27 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Dan Williams <dan.j.williams@...el.com>, eric.long@...soc.com,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Mark Brown <broonie@...nel.org>, dmaengine@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/7] dmaengine: sprd: Add interrupt support for 2-stage transfer

On Mon, 29 Apr 2019 at 20:01, Vinod Koul <vkoul@...nel.org> wrote:
>
> On 15-04-19, 20:15, Baolin Wang wrote:
> > For 2-stage transfer, some users like Audio still need transaction interrupt
> > to notify when the 2-stage transfer is completed. Thus we should enable
> > 2-stage transfer interrupt to support this feature.
> >
> > Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> > ---
> >  drivers/dma/sprd-dma.c |   22 +++++++++++++++++++++-
> >  1 file changed, 21 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
> > index cc9c24d..4c18f44 100644
> > --- a/drivers/dma/sprd-dma.c
> > +++ b/drivers/dma/sprd-dma.c
> > @@ -62,6 +62,8 @@
> >  /* SPRD_DMA_GLB_2STAGE_GRP register definition */
> >  #define SPRD_DMA_GLB_2STAGE_EN               BIT(24)
> >  #define SPRD_DMA_GLB_CHN_INT_MASK    GENMASK(23, 20)
> > +#define SPRD_DMA_GLB_DEST_INT                BIT(22)
> > +#define SPRD_DMA_GLB_SRC_INT         BIT(20)
> >  #define SPRD_DMA_GLB_LIST_DONE_TRG   BIT(19)
> >  #define SPRD_DMA_GLB_TRANS_DONE_TRG  BIT(18)
> >  #define SPRD_DMA_GLB_BLOCK_DONE_TRG  BIT(17)
> > @@ -135,6 +137,7 @@
> >  /* define DMA channel mode & trigger mode mask */
> >  #define SPRD_DMA_CHN_MODE_MASK               GENMASK(7, 0)
> >  #define SPRD_DMA_TRG_MODE_MASK               GENMASK(7, 0)
> > +#define SPRD_DMA_INT_TYPE_MASK               GENMASK(7, 0)
> >
> >  /* define the DMA transfer step type */
> >  #define SPRD_DMA_NONE_STEP           0
> > @@ -190,6 +193,7 @@ struct sprd_dma_chn {
> >       u32                     dev_id;
> >       enum sprd_dma_chn_mode  chn_mode;
> >       enum sprd_dma_trg_mode  trg_mode;
> > +     enum sprd_dma_int_type  int_type;
> >       struct sprd_dma_desc    *cur_desc;
> >  };
> >
> > @@ -429,6 +433,9 @@ static int sprd_dma_set_2stage_config(struct sprd_dma_chn *schan)
> >               val = chn & SPRD_DMA_GLB_SRC_CHN_MASK;
> >               val |= BIT(schan->trg_mode - 1) << SPRD_DMA_GLB_TRG_OFFSET;
> >               val |= SPRD_DMA_GLB_2STAGE_EN;
> > +             if (schan->int_type != SPRD_DMA_NO_INT)
>
> Who configure int_type?

The int_type is configured through the flags of
sprd_dma_prep_slave_sg() by users, see:
https://elixir.bootlin.com/linux/v5.1-rc6/source/include/linux/dma/sprd-dma.h#L9

>
> > +                     val |= SPRD_DMA_GLB_SRC_INT;
> > +
> >               sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP1, val, val);
> >               break;
> >
> > @@ -436,6 +443,9 @@ static int sprd_dma_set_2stage_config(struct sprd_dma_chn *schan)
> >               val = chn & SPRD_DMA_GLB_SRC_CHN_MASK;
> >               val |= BIT(schan->trg_mode - 1) << SPRD_DMA_GLB_TRG_OFFSET;
> >               val |= SPRD_DMA_GLB_2STAGE_EN;
> > +             if (schan->int_type != SPRD_DMA_NO_INT)
> > +                     val |= SPRD_DMA_GLB_SRC_INT;
> > +
> >               sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP2, val, val);
> >               break;
> >
> > @@ -443,6 +453,9 @@ static int sprd_dma_set_2stage_config(struct sprd_dma_chn *schan)
> >               val = (chn << SPRD_DMA_GLB_DEST_CHN_OFFSET) &
> >                       SPRD_DMA_GLB_DEST_CHN_MASK;
> >               val |= SPRD_DMA_GLB_2STAGE_EN;
> > +             if (schan->int_type != SPRD_DMA_NO_INT)
> > +                     val |= SPRD_DMA_GLB_DEST_INT;
> > +
> >               sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP1, val, val);
> >               break;
> >
> > @@ -450,6 +463,9 @@ static int sprd_dma_set_2stage_config(struct sprd_dma_chn *schan)
> >               val = (chn << SPRD_DMA_GLB_DEST_CHN_OFFSET) &
> >                       SPRD_DMA_GLB_DEST_CHN_MASK;
> >               val |= SPRD_DMA_GLB_2STAGE_EN;
> > +             if (schan->int_type != SPRD_DMA_NO_INT)
> > +                     val |= SPRD_DMA_GLB_DEST_INT;
> > +
> >               sprd_dma_glb_update(sdev, SPRD_DMA_GLB_2STAGE_GRP2, val, val);
> >               break;
> >
> > @@ -911,11 +927,15 @@ static int sprd_dma_fill_linklist_desc(struct dma_chan *chan,
> >               schan->linklist.virt_addr = 0;
> >       }
> >
> > -     /* Set channel mode and trigger mode for 2-stage transfer */
> > +     /*
> > +      * Set channel mode, interrupt mode and trigger mode for 2-stage
> > +      * transfer.
> > +      */
> >       schan->chn_mode =
> >               (flags >> SPRD_DMA_CHN_MODE_SHIFT) & SPRD_DMA_CHN_MODE_MASK;
> >       schan->trg_mode =
> >               (flags >> SPRD_DMA_TRG_MODE_SHIFT) & SPRD_DMA_TRG_MODE_MASK;
> > +     schan->int_type = flags & SPRD_DMA_INT_TYPE_MASK;
> >
> >       sdesc = kzalloc(sizeof(*sdesc), GFP_NOWAIT);
> >       if (!sdesc)
> > --
> > 1.7.9.5
>
> --
> ~Vinod



-- 
Baolin Wang
Best Regards