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Message-ID: <e1c362dc-8aac-4d13-9356-8b7ccae4727f@starfivetech.com>
Date:   Fri, 8 Dec 2023 11:00:31 +0800
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Subject: Re: [v3 5/6] drm/vs: Add hdmi driver
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To:     Andy Yan <andyshrk@163.com>
CC:     Maxime Ripard <mripard@kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
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        "tzimmermann@suse.de" <tzimmermann@suse.de>,
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        "krzysztof.kozlowski+dt@linaro.org" 
        <krzysztof.kozlowski+dt@linaro.org>,
        William Qiu <william.qiu@starfivetech.com>,
        Xingyu Wu <xingyu.wu@starfivetech.com>,
        "paul.walmsley@sifive.com" <paul.walmsley@sifive.com>,
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        Shengyang Chen <shengyang.chen@starfivetech.com>,
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        Changhuang Liang <changhuang.liang@starfivetech.com>,
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        <maarten.lankhorst@linux.intel.com>,
        "suijingfeng@loongson.cn" <suijingfeng@loongson.cn>
References: <20231204123315.28456-1-keith.zhao@starfivetech.com>
 <20231204123315.28456-6-keith.zhao@starfivetech.com>
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 <40cdd3c7-174e-4611-9ea6-22cb56d1f62b@starfivetech.com>
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 <e0b84511-dbb4-46fa-9465-713369232f6f@starfivetech.com>
 <43e42269.314.18c46dbb4c5.Coremail.andyshrk@163.com>
From:   Keith Zhao <keith.zhao@starfivetech.com>
In-Reply-To: <43e42269.314.18c46dbb4c5.Coremail.andyshrk@163.com>
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On 2023/12/8 8:37, Andy Yan wrote:
> Hi Keth：
> 
> 
> 
> 
> 
> 
> 在 2023-12-07 18:48:13，"Keith Zhao" <keith.zhao@starfivetech.com> 写道：
>>
>>
>>On 2023/12/7 17:02, Andy Yan wrote:
>>> 
>>> 
>>> 
>>> 
>>> Hi Keith：
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> At 2023-12-06 22:11:33, "Keith Zhao" <keith.zhao@starfivetech.com> wrote:
>>>>
>>>>
>>>>On 2023/12/6 20:56, Maxime Ripard wrote:
>>>>> On Wed, Dec 06, 2023 at 08:02:55PM +0800, Keith Zhao wrote:
>>>>>> >> +static const struct of_device_id starfive_hdmi_dt_ids[] = {
>>>>>> >> +	{ .compatible = "starfive,jh7110-inno-hdmi",},
>>>>>> > 
>>>>>> > So it's inno hdmi, just like Rockchip then?
>>>>>> > 
>>>>>> > This should be a common driver.
>>>>>>
>>>>>> Rockchip has a inno hdmi IP. and Starfive has a inno hdmi IP.
>>>>>> but the harewawre difference of them is big , it is not easy to use the common driver
>>>>>> maybe i need the inno hdmi version here to make a distinction
>>>>> 
>>>>> I just had a look at the rockchip header file: all the registers but the
>>>>> STARFIVE_* ones are identical.
>>>>> 
>>>>> There's no need to have two identical drivers then, please use the
>>>>> rockchip driver instead.
>>>>> 
>>>>> Maxime
>>>>
>>>>ok, have a simple test , edid can get . i will continue 
>>> 
>>> Maybe you can take drivers/gpu/drm/bridge/synopsys/dw-hdmi as a reference， this
>>> is also a hdmi ip used by rockchip/meson/sunxi/jz/imx。
>>> We finally make it share one driver。
>>>>
>>hi Andy:
>>
>>dw_hdmi seems a good choice , it can handle inno hdmi hardware by define its dw_hdmi_plat_data.
>>does it means i can write own driver files such as(dw_hdmi-starfive.c) based on dw_hdmi instead of add plat_data in inno_hdmi.c
>>
> 
> I think the process maybe like this：
> 
> 1. split the inno_hdmi.c under rockchip to  inno_hdmi.c(the common part), inno_hdmi-rockchip.c(the soc specific part)
> 2. move the common part inno_hdmi.c to drivers/gpu/drm/bridge/innosilicon/
> 3. add startfive specific part, inno_hdmi-startfive.c
> 
> bellow git log from kernel three show how we convert  dw_hdmi to a common driver: 
> 
> 
> 
> 12b9f204e804 drm: bridge/dw_hdmi: add rockchip rk3288 support
> 74af9e4d03b8 dt-bindings: Add documentation for rockchip dw hdmi
> d346c14eeea9 drm: bridge/dw_hdmi: add function dw_hdmi_phy_enable_spare
> a4d3b8b050d5 drm: bridge/dw_hdmi: clear i2cmphy_stat0 reg in hdmi_phy_wait_i2c_done
> 632d035bace2 drm: bridge/dw_hdmi: add mode_valid support
> 0cd9d1428322 drm: bridge/dw_hdmi: add support for multi-byte register width access
> cd152393967e dt-bindings: add document for dw_hdmi
> b21f4b658df8 drm: imx: imx-hdmi: move imx-hdmi to bridge/dw_hdmi
> aaa757a092c2 drm: imx: imx-hdmi: split phy configuration to platform driver
> 3d1b35a3d9f3 drm: imx: imx-hdmi: convert imx-hdmi to drm_bridge mode
> c2c3848851a7 drm: imx: imx-hdmi: return defer if can't get ddc i2c adapter
> b587833933de drm: imx: imx-hdmi: make checkpatch happy
> 
hi Andy:
I got you means, 
as I don't have a rockchip board on hand , to split the inno_hdmi.c can not be tested.

how adout this idea:
1、split the starfive_hdmi.c under verisilicion to  inno_hdmi.c(the common part), inno_hdmi-starfive.c(the soc specific part)
2. move the common part inno_hdmi.c to drivers/gpu/drm/bridge/innosilicon/
3. In the future, inno hdmi.c under rockchip will reuse the public driver.

> 
>>Thanks for pointing this out!!!
>>
>>>>
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