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

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Message-ID: <2203458.KiezcSG77Q@diego>
Date: Tue, 10 Dec 2024 00:12:26 +0100
From: Heiko Stübner <heiko@...ech.de>
To: Daniel Semkowicz <dse@...umatec.com>,
 Diederik de Haas <didi.debian@...ow.org>, andy.yan@...k-chips.com
Cc: 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

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.


Heiko


> 
> On my PineTab2 I got similar messages about 2 weeks ago:
> rockchip-drm display-subsystem: [drm] *ERROR* POST_BUF_EMPTY irq err at vp1
> 
> Preceding those, I got several panfrost related errors:
> 
> panfrost fde60000.gpu: get clock failed -517
> panfrost fde60000.gpu: clk init failed -517
> platform fde60000.gpu: deferred probe pending: (reason unknown)
> platform cpufreq-dt: deferred probe pending: (reason unknown)
> vdd_gpu_npu: disabling
> 
> But can also be that the PineTab2 (likely) needs regulator-always-on
> and regulator-boot-on in its vdd_gpu_npu node.
> 
> > I tried to track down the problem, and it seems to be a generic issue
> > when horizontal line width is not divisible by 4.
> > Lowering line width to 1364px fixes the issue, but of course I have two
> > vertical lines of black pixels on the right.
> > I also made some tests with 720x1280 DSI display. Lowering horizontal
> > line to 718px shows the same problem. With 720px and 716px it works
> > correctly.
> 
> I haven't look further into it, but the PT2 has a 1280x800 resolution.
> 
> HTH,
>   Diederik
>