linux-kernel - Re:Re: [PATCH v3 0/3] drm/rockchip: Add driver for the new DSI2 controller

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Message-ID: <33e2c5db.1300.193ae284b6d.Coremail.andyshrk@163.com>
Date: Tue, 10 Dec 2024 09:21:36 +0800 (CST)
From: "Andy Yan" <andyshrk@....com>
To: "Dmitry Baryshkov" <dmitry.baryshkov@...aro.org>
Cc: Heiko Stübner <heiko@...ech.de>, 
	"Daniel Semkowicz" <dse@...umatec.com>, 
	"Diederik de Haas" <didi.debian@...ow.org>, andy.yan@...k-chips.com, 
	Laurent.pinchart@...asonboard.com, andrzej.hajda@...el.com, 
	conor+dt@...nel.org, devicetree@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, jernej.skrabec@...il.com, 
	jonas@...boo.se, krzk+dt@...nel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-rockchip@...ts.infradead.org, 
	maarten.lankhorst@...ux.intel.com, mripard@...nel.org, 
	neil.armstrong@...aro.org, quentin.schulz@...rry.de, 
	rfoss@...nel.org, robh@...nel.org, tzimmermann@...e.de
Subject: Re:Re: [PATCH v3 0/3] drm/rockchip: Add driver for the new DSI2
 controller


Hi Dmitry,

在 2024-12-10 09:01:38，"Dmitry Baryshkov" <dmitry.baryshkov@...aro.org> 写道：
>On Tue, Dec 10, 2024 at 08:50:51AM +0800, Andy Yan wrote:
>> 
>> 
>> Hi,
>> 
>> At 2024-12-10 07:12:26, "Heiko Stübner" <heiko@...ech.de> wrote:
>> >Am Montag, 9. Dezember 2024, 17:11:03 CET schrieb Diederik de Haas:
>> >> Hi,
>> >> 
>> >> On Mon Dec 9, 2024 at 4:06 PM CET, Daniel Semkowicz wrote:
>> >> > On 03.12.24 21:54, Heiko Stuebner wrote:
>> >> > > This series adds a bridge and glue driver for the DSI2 controller found
>> >> > > in the rk3588 soc from Rockchip, that is based on a Synopsis IP block.
>> >> > > 
>> >> >
>> >> > I did more tests with different LVDS displays. I tested following
>> >> > configurations with DSI/LVDS bridge:
>> >> > - 1024x600@...01
>> >> > - 1024x768@...02
>> >> > - 1280x800@...07
>> >> > - 1366x768@...06
>> >> >
>> >> > All of them worked without issues, except 1366x768.
>> >> > With this resolution, video is blurry, and offset incorrectly
>> >> > to the left. There are also repeating errors on the console:
>> >> >
>> >> >   rockchip-drm display-subsystem: [drm] *ERROR* POST_BUF_EMPTY irq err at vp3
>> >> >
>> >> > In correct operation with other resolutions, there is no error.
>> >> > I am not sure if this is a problem in your series or rather in VOP2
>> >> > driver.
>> >
>> >This really sounds like something is wrong on the vop side.
>> >The interrupt is part of the vop, the divisable by 4 things likely too.
>> 
>> This is a hardware limitation on vop side:
>> The horizontal resolution must be 4 pixel aligned.
>
>Then mode_valid() and atomic_check() must reject modes that don't fit.

We round down to 4 pixel aligned in mode_fixup in our bsp kernel, 
because sometimes, some boards do indeed choose a screen that is not 4 pixel aligned
>
>> 
>> 
>> 
>
>-- 
>With best wishes
>Dmitry