From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: linux-sh@vger.kernel.org
Subject: Re: [PATCH v3 0/9] R-Car Gen2 DMA Controller driver
Date: Wed, 29 Oct 2014 11:22:59 +0000 [thread overview]
Message-ID: <7382991.mN71S6k9c6@avalon> (raw)
In-Reply-To: <1414345216-14486-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com>
Hi Morimoto-san,
On Tuesday 28 October 2014 17:04:01 Kuninori Morimoto wrote:
> Hi Laurent, Simon
>
> > > On Lager board + SDHI
> > >
> > > Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
> >
> > Thank you.
> >
> > > Current SDHI driver + DMAC is working, but super slow,
> > > especially, write case....
> >
> > *sigh* I'll test that.
>
> Maybe this is SDHI side issue (?)
> Buswidth/clock/setting etc etc etc...
> No one used SDHI + DMA in DT and in R-Car Gen2 today.
I've performed my tests using a 2 bytes bus width. Using a 4 bytes bus width I
get similar performances for PIO and DMA. 16 bytes and 32 bytes bus widths
don't work out of the box, they would need more work.
> So, I guess it is very safety if we can ignore SDHI + DMA in upstream
> -> Simon ?
--
Regards,
Laurent Pinchart
next prev parent reply other threads:[~2014-10-29 11:22 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-26 17:40 [PATCH v3 0/9] R-Car Gen2 DMA Controller driver Laurent Pinchart
2014-10-27 0:45 ` Simon Horman
2014-10-28 3:03 ` Kuninori Morimoto
2014-10-28 21:02 ` Laurent Pinchart
2014-10-29 0:04 ` Kuninori Morimoto
2014-10-29 2:36 ` Magnus Damm
2014-10-29 7:24 ` Magnus Damm
2014-10-29 9:49 ` Laurent Pinchart
2014-10-29 9:49 ` Phil Edworthy
2014-10-29 9:59 ` Geert Uytterhoeven
2014-10-29 10:05 ` Laurent Pinchart
2014-10-29 11:15 ` Laurent Pinchart
2014-10-29 11:22 ` Laurent Pinchart [this message]
2014-10-30 0:16 ` Simon Horman
2014-10-30 13:41 ` Wolfram Sang
2014-11-04 7:07 ` Magnus Damm
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