linux-kernel - Re: [PATCH v4 00/21] ARM: support for ICP DAS LP-8x4x (with dts)

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Message-ID: <534EC04F.9010408@gmail.com>
Date:	Wed, 16 Apr 2014 19:39:27 +0200
From:	Daniel Mack <zonque@...il.com>
To:	Sergei Ianovich <ynvich@...il.com>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
CC:	Arnd Bergmann <arnd@...db.de>,
	Haojian Zhuang <haojian.zhuang@...il.com>
Subject: Re: [PATCH v4 00/21] ARM: support for ICP DAS LP-8x4x (with dts)

Hi,

On 04/16/2014 07:13 PM, Sergei Ianovich wrote:
> We had an intensive discussion of the series in the beginning of
> December 2013 [1]. The discussion resulted in 3 versions of the series
> in less than 3 weeks. Then there was a decision to block this series
> until Daniel Mack's DMA-engine-for-PXA series is ready.

For whatever reason, I only received patches 1-8 out of 21 in this series.

> Unfortunately Daniel neigther agrees to review my trivial temporary
> solution to the DMA-in-device-tree (patch 7 of 21), nor he is active
> in DMA series development. There is no progress for 3 months.

Well, IIRC, I asked you to look into the MMC performance regressions
that you reported and see what we can do about them. I currently don't
have hardware to reproduce this, so I can't do it myself.

My impression is that the transisiton will only be painless if the
mmp_pdma driver provides comparable performance to the existing
implementation. I also still think that adding hacks to the drivers to
manually parse the dma properties (as in #8) brings us further away from
a proper solution, not closer.

> As with any big out of tree series, its support is painful. It requires
> extensive merging when doing bisects, on each step.

I know that, and I'm not violently against getting your patches in. I
was just hoping for some help around here in order to sort out things
and implement it properly. The reason why I haven't been working on
these drivers lately is simply the sheer lack of time :(

Thanks,
Daniel

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