linux-kernel - Re: [PATCH v4 0/7] Convert inno hdmi to drm bridge

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Message-ID: <83ba11db-9a9e-48b7-afe0-9df7b5de3e85@oss.qualcomm.com>
Date: Fri, 9 May 2025 18:19:23 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Andy Yan <andyshrk@....com>
Cc: Heiko Stübner <heiko@...ech.de>, conor+dt@...nel.org,
        krzk+dt@...nel.org, robh@...nel.org, hjc@...k-chips.com,
        mripard@...nel.org, neil.armstrong@...aro.org, knaerzche@...il.com,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, Andy Yan <andy.yan@...k-chips.com>
Subject: Re: [PATCH v4 0/7] Convert inno hdmi to drm bridge

On 09/05/2025 04:58, Andy Yan wrote:
> 
> Hi Dmitry,
> 
>   Thanks for you review.
> 
> 在 2025-05-05 00:16:35，"Dmitry Baryshkov" <dmitry.baryshkov@....qualcomm.com> 写道：
>> On Sat, May 03, 2025 at 04:42:04PM +0200, Heiko Stübner wrote:
>>> Am Dienstag, 22. April 2025, 09:04:39 Mitteleuropäische Sommerzeit schrieb Andy Yan:
>>>> From: Andy Yan <andy.yan@...k-chips.com>
>>>>
>>>> When preparing to convert the current inno hdmi driver into a
>>>> bridge driver, I found that there are several issues currently
>>>> existing with it:
>>>>
>>>> 1. When the system starts up, the first time it reads the EDID, it
>>>>     will fail. This is because RK3036 HDMI DDC bus requires it's PHY's
>>>>     reference clock to be enabled first before normal DDC communication
>>>>     can be carried out.
>>>>
>>>> 2. The signal is unstable. When running the glmark2 test on the screen,
>>>>     there is a small probability of seeing some screen flickering.
>>>>     This is because The HSYNC/VSYNC polarity of rk3036 HDMI are controlled
>>>>     by GRF. This part is missing in the current driver.
>>>>
>>>> PATCH 1~6 are try to Fix Document in the dt-binding, then add the
>>>> missing part in driver and dts.
>>>> PATCH 7 converts the curren driver to drm bridge mode.
>>>
>>> After resurrecting my rk3036-kylin which hasn't sucessfully booted in a
>>> while, I could veryify this series, so on a rk3036-kylin
>>>
>>> Tested-by: Heiko Stuebner <heiko@...ech.de>
>>>
>>>
>>> I'll probably apply patches 1-4 to drm-misc later today, as that solely
>>> touches the Rockchip (and only rk3036-)side and patches 5+6 to the
>>> rockchip tree.
>>>
>>> Patch 7 should probably get some attention by people more familiar with
>>> drm-bridges, so I'll let that sit for a bit longer.
>>
>> I will take a look later, but on the first glance it looks like there
>> are too many things going on in that patch, including some unnecessary
>> fnction movements and define movements, etc. I would kindly ask to split
> 
> These registers were initially defined in a separate header file(inno_hdmi.h),
> but they were only used by a single C file, so I think it's not necessary to put
> them in a separate header file. I decided to simply merge them into the inno_hdmi.c file.
> If I first create a patch and separately carry out the merging of this register definition, would that be possible?

Yes, just create a separate commit, folding the header into the source file.

> 
> And I will try to avoid function movements in next version.
> 
> 
>> the non-functional refactorings and the functional ones (splitting to a
>> library, etc).
> 
> Will do in next version.
> 
>>
>>>
>>>
>>> Thanks a lot for working on all this
>>> Heiko
>>>
>>>
>>
>> -- 
>> With best wishes
>> Dmitry


-- 
With best wishes
Dmitry