linux-kernel - Re: [PATCH v2 1/5] DMA: pl330: support burst mode for dev-to-mem and mem-to-dev transmit

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Date:	Mon, 31 Aug 2015 15:22:59 -0700
From:	Sonny Rao <sonnyrao@...omium.org>
To:	Shawn Lin <shawn.lin@...k-chips.com>
Cc:	Vinod Koul <vinod.koul@...el.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Boojin Kim <boojin.kim@...sung.com>,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olof@...om.net>,
	Addy Ke <addy.ke@...k-chips.com>, dmaengine@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>
Subject: Re: [PATCH v2 1/5] DMA: pl330: support burst mode for dev-to-mem and
 mem-to-dev transmit

On Thu, Aug 27, 2015 at 5:37 PM, Shawn Lin <shawn.lin@...k-chips.com> wrote:
> From: Boojin Kim <boojin.kim@...sung.com>
>
> This patch adds to support burst mode for dev-to-mem and
> mem-to-dev transmit.
>
> Signed-off-by: Boojin Kim <boojin.kim@...sung.com>
> Signed-off-by: Addy Ke <addy.ke@...k-chips.com>
> Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
> cc: Heiko Stuebner <heiko@...ech.de>
> cc: Doug Anderson <dianders@...omium.org>
> cc: Olof Johansson <olof@...om.net>
>
> ---
>
> Changes in v2:
> - amend the author
> - amend Olof's mail address
>
> Changes in v1:
> - rename broken-no-flushp to "arm,pl330-broken-no-flushp" suggested
>   by Krzysztof.
> - add From original author.
> - remove Sunny's tag
>
>  drivers/dma/pl330.c | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
> index ecab4ea0..0d544d2 100644
> --- a/drivers/dma/pl330.c
> +++ b/drivers/dma/pl330.c
> @@ -1141,10 +1141,13 @@ static inline int _ldst_devtomem(unsigned dry_run, u8 buf[],
>                 const struct _xfer_spec *pxs, int cyc)
>  {
>         int off = 0;
> +       enum pl330_cond cond;
> +
> +       cond = (pxs->desc->rqcfg.brst_len == 1) ? SINGLE : BURST;
>
>         while (cyc--) {
> -               off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->desc->peri);
> -               off += _emit_LDP(dry_run, &buf[off], SINGLE, pxs->desc->peri);
> +               off += _emit_WFP(dry_run, &buf[off], cond, pxs->desc->peri);
> +               off += _emit_LDP(dry_run, &buf[off], cond, pxs->desc->peri);
>                 off += _emit_ST(dry_run, &buf[off], ALWAYS);
>                 off += _emit_FLUSHP(dry_run, &buf[off], pxs->desc->peri);
>         }
> @@ -1156,11 +1159,14 @@ static inline int _ldst_memtodev(unsigned dry_run, u8 buf[],
>                 const struct _xfer_spec *pxs, int cyc)
>  {
>         int off = 0;
> +       enum pl330_cond cond;
> +
> +       cond = (pxs->desc->rqcfg.brst_len == 1) ? SINGLE : BURST;
>
>         while (cyc--) {
> -               off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->desc->peri);
> +               off += _emit_WFP(dry_run, &buf[off], cond, pxs->desc->peri);
>                 off += _emit_LD(dry_run, &buf[off], ALWAYS);
> -               off += _emit_STP(dry_run, &buf[off], SINGLE, pxs->desc->peri);
> +               off += _emit_STP(dry_run, &buf[off], cond, pxs->desc->peri);
>                 off += _emit_FLUSHP(dry_run, &buf[off], pxs->desc->peri);
>         }
>
> @@ -2557,7 +2563,7 @@ static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic(
>
>                 desc->rqtype = direction;
>                 desc->rqcfg.brst_size = pch->burst_sz;
> -               desc->rqcfg.brst_len = 1;
> +               desc->rqcfg.brst_len = pch->burst_len;
>                 desc->bytes_requested = period_len;
>                 fill_px(&desc->px, dst, src, period_len);
>
> @@ -2702,7 +2708,7 @@ pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
>                 }
>
>                 desc->rqcfg.brst_size = pch->burst_sz;
> -               desc->rqcfg.brst_len = 1;
> +               desc->rqcfg.brst_len = pch->burst_len;
>                 desc->rqtype = direction;
>                 desc->bytes_requested = sg_dma_len(sg);
>         }
> --
> 2.3.7

Reviewed-by: Sonny Rao <sonnyrao@...omium.org>

>
>
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