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

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Message-ID: <CAA8EJprLA09NP0KAztc5eoAMkGcrom84jg_pcbNcwN0FAaSLrw@mail.gmail.com>
Date: Tue, 10 Dec 2024 03:45:11 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Andy Yan <andyshrk@....com>
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

On Tue, 10 Dec 2024 at 03:22, Andy Yan <andyshrk@....com> wrote:
>
>
> 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,

What is meant by the "bsp kernel" here? I don't see it being present
in the mainline kernel. So, if the mode is unsupported, it should be
rejected.

> because sometimes, some boards do indeed choose a screen that is not 4 pixel aligned
> >
> >>
> >>
> >>
> >
> >--
> >With best wishes
> >Dmitry



-- 
With best wishes
Dmitry