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

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Message-ID: <1a07d69.1e47.196b2c3aa12.Coremail.andyshrk@163.com>
Date: Fri, 9 May 2025 09:58:09 +0800 (CST)
From: "Andy Yan" <andyshrk@....com>
To: "Dmitry Baryshkov" <dmitry.baryshkov@....qualcomm.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:Re: [PATCH v4 0/7] Convert inno hdmi to drm bridge


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?

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