Message-ID: <CACvgo52SDcRtkNuNSF6dsw_TXV5wrMmW4_ci_4uX63CJrcBg+w@mail.gmail.com>
Date:	Fri, 20 Nov 2015 12:19:54 +0000
From:	Emil Velikov <emil.l.velikov@...il.com>
To:	Chris Zhong <zyw@...k-chips.com>
Cc:	Heiko Stübner <heiko@...ech.de>,
	linux-rockchip <linux-rockchip@...ts.infradead.org>,
	Mark Yao <mark.yao@...k-chips.com>,
	Mark Rutland <mark.rutland@....com>,
	Michael Turquette <mturquette@...libre.com>,
	Kever Yang <kever.yang@...k-chips.com>,
	ML dri-devel <dri-devel@...ts.freedesktop.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	linux-clk@...r.kernel.org, Vincent Palatin <vpalatin@...omium.org>,
	Jeff Chen <cym@...k-chips.com>,
	Ajay Kumar <ajaykumar.rs@...sung.com>,
	Andrew Bresticker <abrestic@...omium.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Thierry Reding <treding@...dia.com>,
	devicetree@...r.kernel.org, Alexandru M Stan <amstan@...omium.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Roger Chen <roger.chen@...k-chips.com>,
	Russell King <linux@....linux.org.uk>,
	Sonny Rao <sonnyrao@...omium.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	Huang Lin <hl@...k-chips.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Doug Anderson <dianders@...omium.org>,
	Kumar Gala <galak@...eaurora.org>,
	Andy Yan <andy.yan@...k-chips.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v3 00/12] Add mipi dsi support for rk3288

On 20 November 2015 at 07:02, Chris Zhong <zyw@...k-chips.com> wrote:
> Hi Emil
>
> On 11/19/2015 10:41 PM, Emil Velikov wrote:
>>
>> On 19 November 2015 at 03:35, Chris Zhong <zyw@...k-chips.com> wrote:
>>>
>>> The rk3288 MIPI DSI is a Synopsys DesignWare MIPI DSI host controller
>>> IP. This series adds support for a Synopsys DesignWare MIPI DSI host
>>> controller DRM bridge driver and a rockchip MIPI DSI specific DRM
>>> driver.
>>>
>>> This series also includes a DRM panel driver for BOE TV080WUM-NL0 panel.
>>> This panel only use the MIPI DSI video mode.
>>>
>>> The MIPI DSI feature is tested on rk3288 evb board, backport them to
>>> chrome os kernel v3.14, and it can display normally.
>>>
>>> This patchset is base on the patchset from Ying.liu@...escale.com.
>>> <http://www.spinics.net/lists/dri-devel/msg77181.html>
>>>
>>>
>>> Changes in v3:
>>> move the dw_mipi_dsi.txt to
>>> Documentation/devicetree/bindings/display/bridge
>>> move dw_mipi_dsi_rockchip.txt to bindings/display/rockchip/
>>> move boe,tv080wum-nl0.txt to bindings/display/panel/
>>>
>>> Changes in v2:
>>> add the mipi clk id in a single patch
>>> As Thierry.Reding comment, add a documentation for this panel.
>>>
>>> Chris Zhong (10):
>>>    clk: rockchip: add id for mipidsi sclk on rk3288
>>>    clk: rockchip: add mipidsi clocks on rk3288
>>>    drm/rockchip: return a true clock rate to adjusted_mode
>>>    drm/bridge: Add Synopsys DesignWare MIPI DSI host controller driver
>>
>> Did you actually rewrite the patch from Liu Ying ?
>
> I modify the dw_mipi_dsi.c based on the patch from Liu Ying.
If you base your work on top of (i.e. you rework) someone else's patch
you should retain this authorship and signed-off-by line. This of
course is not limited to the above patch but a general rule, afaik.

>>
>> Out of curiosity what was the obstacle of this work getting merged ?
>
> There are different version dw controller, and it is too hard to merge them,
> since most registers are different.
Have you discussed this limitation with Liu ? Does your work handle
both versions of the controller ? If so your commit message should say
something about that. Here are some good sources on the whats and whys
wrt writing good commit messages [1] [2]

[1] http://who-t.blogspot.co.uk/2009/12/on-commit-messages.html
[2] http://chris.beams.io/posts/git-commit/

>>
>>
>>>    drm: rockchip: Support Synopsys DesignWare MIPI DSI host controller
>>>    Documentation: dt-bindings: Add bindings for rk3288 DW MIPI DSI driver
>>>    ARM: dts: rockchip: add rk3288 mipi_dsi nodes
>>>    drm/panel: simple: Add support for BOE TV080WUM-NL0
>>>    drm/panel: simple: Add boe,tv080wum-nl0 simple panel device tree
>>>      binding
>>
>> As the DT people will tell you - there is no BOE vendor in
>> bindings/vendor-prefixes.txt.
>
> Yes, I have post a verdor patch in v2 series,
> <https://patchwork.kernel.org/patch/7530791/>
> Maybe I should add it back to series with
>
> Acked-by: Rob Herring<robh@...nel.org>
>
If a patch has been reviewed/acked that's great. Add the tag, but
please do not drop patches until they are merged. In the latter case
you can mention that your series depends on branch X from repo Y.

>>
>>>    ARM: dts: rockchip: add support mipi panel tv080wum-nl0 for rk3288-evb
>>>
>>> Liu Ying (2):
>>>    drm/dsi: Add a helper to get bits per pixel of MIPI DSI pixel format
>>>    Documentation: dt-bindings: Add bindings for Synopsys DW MIPI DSI DRM
>>>      bridge driver
>>>
>> >From the above 12 patches only ~6 reached this mailing list is that
>> intentional ? Previously I've seen people CC dri-devel for their
>> panel/bridge DT patches.
>
> I use the patman to post the series, forgot to add you and Thierry to the
> to-list.
> I will fix in next version series. Thanks for your reply.
>
No need to add me bth. Thierry on the other hand should be Cc'd on the
patches where he's the maintainer.

As the To/Cc list is already quite excessive - I'd suggest following
the approach used by veterans in kernel development.

I'm not a veteran kernel dev, but this is what I've noticed over the years:
 - Subsystem foo - mailing-list, maintainer(s), and optionally the top
1-2 developers
 - Other subsystems - mailing-list and optionally the maintainer(s).

Thus in the case of the panel driver you'll get - dri-devel, Thierry
and optionally(?) devicetree
For the DT binding for the panel driver - devicetree, Rob, dri-devel, Thierry.

...I think you get the idea :-)

Regards,
Emil
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