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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <jl5obi7rd4h6ywozeqruxq2vx62sx5yf4wwpksrq3prdleps2k@d3zbr5ttquvn>
Date: Tue, 10 Dec 2024 14:32:03 +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: [PATCH v3 0/3] drm/rockchip: Add driver for the new DSI2
 controller

On Tue, Dec 10, 2024 at 09:54:09AM +0800, Andy Yan wrote:
> 
> Hi Dmitry,
> 
> 在 2024-12-10 09:45:11，"Dmitry Baryshkov" <dmitry.baryshkov@...aro.org> 写道：
> >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
> 
> bsp kernel means downstream vendor kernel.
> 
> >in the mainline kernel. So, if the mode is unsupported, it should be
> 
> Will it be acceptable to add this round down in the mainline mode_fixup?

I think so.

> 
> >rejected.
> >
> >> because sometimes, some boards do indeed choose a screen that is not 4 pixel aligned

-- 
With best wishes
Dmitry