Message-ID: <CAF6AEGuGKitXGE8S-fE-d+-MWDBxU-XqG_AH7q9FD0y5YkBFVQ@mail.gmail.com>
Date:	Tue, 23 Sep 2014 09:56:36 -0400
From:	Rob Clark <robdclark@...il.com>
To:	cym <cym@...k-chips.com>
Cc:	Mark yao <mark.yao@...k-chips.com>,
	Heiko Stübner <heiko@...ech.de>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	David Airlie <airlied@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Grant Likely <grant.likely@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	John Stultz <john.stultz@...aro.org>,
	Rom Lemarchand <romlem@...gle.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-doc@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	linux-api@...r.kernel.org, linux-rockchip@...ts.infradead.org,
	Douglas Anderson <dianders@...omium.org>,
	Stéphane Marchesin <marcheu@...omium.org>,
	dbehr@...omium.org, Olof Johansson <olof@...om.net>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Jianqun Xu <xjq@...k-chips.com>, kfx@...k-chips.com,
	Eddie Cai <cf@...k-chips.com>,
	Chris Zhong <zyw@...k-chips.com>,
	simon xue <xxm@...k-chips.com>,
	Tao Huang <huangtao@...k-chips.com>,
	Kever Yang <kever.yang@...k-chips.com>, yxj@...k-chips.com,
	王晓腾 <wxt@...k-chips.com>, xw@...k-chips.com,
	Jeff Chen <jeff.chen@...k-chips.com>
Subject: Re: [PATCH v4 5/5] drm/rockchip: Add support for Rockchip Soc EDP

On Tue, Sep 23, 2014 at 4:47 AM, cym <cym@...k-chips.com> wrote:
>
> On Tuesday, September 23, 2014 03:20 AM, Rob Clark wrote:
>>
>> On Mon, Sep 22, 2014 at 7:02 AM, Mark yao <mark.yao@...k-chips.com> wrote:
>>>
>>> This adds support for Rockchip soc edp found on rk3288
>>>
>>> Signed-off-by: Mark Yao <mark.yao@...k-chips.com>
>>> Signed-off-by: Jeff Chen <jeff.chen@...k-chips.com>
>>> ---
>>> Changes in v2:
>>> - fix code sytle
>>> - use some define from drm_dp_helper.h
>>> - use panel-simple driver for primary display.
>>> - remove unnecessary clock clk_24m_parent.
>>>
>>> Changes in v3: None
>>>
>>> Changes in v4: None
>>>
>>>   drivers/gpu/drm/rockchip/Kconfig             |    9 +
>>>   drivers/gpu/drm/rockchip/Makefile            |    2 +
>>>   drivers/gpu/drm/rockchip/rockchip_edp_core.c |  853 ++++++++++++++++++
>>>   drivers/gpu/drm/rockchip/rockchip_edp_core.h |  309 +++++++
>>>   drivers/gpu/drm/rockchip/rockchip_edp_reg.c  | 1202
>>> ++++++++++++++++++++++++++
>>>   drivers/gpu/drm/rockchip/rockchip_edp_reg.h  |  345 ++++++++
>>>   6 files changed, 2720 insertions(+)
>>>   create mode 100644 drivers/gpu/drm/rockchip/rockchip_edp_core.c
>>>   create mode 100644 drivers/gpu/drm/rockchip/rockchip_edp_core.h
>>>   create mode 100644 drivers/gpu/drm/rockchip/rockchip_edp_reg.c
>>>   create mode 100644 drivers/gpu/drm/rockchip/rockchip_edp_reg.h
>>>
>>> diff --git a/drivers/gpu/drm/rockchip/Kconfig
>>> b/drivers/gpu/drm/rockchip/Kconfig
>>> index 7146c80..04b1f8c 100644
>>> --- a/drivers/gpu/drm/rockchip/Kconfig
>>> +++ b/drivers/gpu/drm/rockchip/Kconfig
>>> @@ -17,3 +17,12 @@ config DRM_ROCKCHIP
>>>            management to userspace. This driver does not provides
>>>            2D or 3D acceleration; acceleration is performed by other
>>>            IP found on the SoC.
>>> +
>>> +config ROCKCHIP_EDP
>>> +       bool "Rockchip edp support"
>>> +       depends on DRM_ROCKCHIP
>>> +       help
>>> +         Choose this option if you have a Rockchip eDP.
>>> +         Rockchip rk3288 SoC has eDP TX Controller can be used.
>>> +         If you have an Embedded DisplayPort Panel, say Y to enable its
>>> +         driver.
>>> diff --git a/drivers/gpu/drm/rockchip/Makefile
>>> b/drivers/gpu/drm/rockchip/Makefile
>>> index 6e6d468..a0fc3a1 100644
>>> --- a/drivers/gpu/drm/rockchip/Makefile
>>> +++ b/drivers/gpu/drm/rockchip/Makefile
>>> @@ -7,4 +7,6 @@ ccflags-y := -Iinclude/drm -Idrivers/gpu/drm/rockchip
>>>   rockchipdrm-y := rockchip_drm_drv.o rockchip_drm_fb.o
>>> rockchip_drm_fbdev.o \
>>>                  rockchip_drm_gem.o rockchip_drm_vop.o
>>>
>>> +rockchipdrm-$(CONFIG_ROCKCHIP_EDP) += rockchip_edp_core.o
>>> rockchip_edp_reg.o
>>> +
>>>   obj-$(CONFIG_DRM_ROCKCHIP) += rockchipdrm.o
>>> diff --git a/drivers/gpu/drm/rockchip/rockchip_edp_core.c
>>> b/drivers/gpu/drm/rockchip/rockchip_edp_core.c
>>> new file mode 100644
>>> index 0000000..5450d1fa
>>> --- /dev/null
>>> +++ b/drivers/gpu/drm/rockchip/rockchip_edp_core.c
>>> @@ -0,0 +1,853 @@
>>> +/*
>>> +* Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
>>> +* Author:
>>> +*      Andy yan <andy.yan@...k-chips.com>
>>> +*      Jeff chen <jeff.chen@...k-chips.com>
>>> +*
>>> +* based on exynos_dp_core.c
>>> +*
>>
>> hmm, did you look at all at drm_dp_helpers?  The exynos code probably
>> pre-dates the helpers, so might not be the best example to work off
>> of..
>>
>> If there is actually a valid reason not to use the dp-helpers, then
>> you should mention the reasons, at least in the commit msg if not the
>> code
>>
>> BR,
>> -R
>
> Thanks Rob,Because RK3288 eDP controller IP design is similar to exynos.They
> from same IP vendors but have some difference.
> So we choosed exynos_dp as example to work off of.exynos_dp only used some
> defines from drm_dp_helper.h like DPCD.
>


Hmm, it sounds like it perhaps should be refactored out into a
drm_bridge so more of it can be shared between rockchip and exynos.

Either way, it should be using the drm_dp_helpers..  That "the code I
copied did it wrong" isn't a terribly good reason for new drivers to
do it wrong.

So NAK for the eDP part until you use the helpers.

BR,
-R
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