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

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Message-ID: <CAMz4kuJ6EUbaHKCnQeYrJB+TjgaZGt=590C89t6i26meMdGsKA@mail.gmail.com>
Date:   Tue, 30 Apr 2019 13:37:00 +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 22:10, Vinod Koul <vkoul@...nel.org> wrote:
>
> On 29-04-19, 20:11, Baolin Wang wrote:
> > On Mon, 29 Apr 2019 at 20:01, Vinod Koul <vkoul@...nel.org> wrote:
> > > On 15-04-19, 20:15, Baolin Wang wrote:
>
> > > > @@ -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
>
> Please use DMA_PREP_INTERRUPT flag instead!

We can not use DMA_PREP_INTERRUPT flag, since we have some Spreadtrum
specific DMA interrupt flags configured by users, which I think we
have made a consensus before. See:
https://elixir.bootlin.com/linux/v5.1-rc6/source/include/linux/dma/sprd-dma.h#L105

-- 
Baolin Wang
Best Regards