linux-kernel - Re: [PATCH v3 08/14] drm/mediatek: Add DRM_MODE_ROTATE

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Message-ID: <CAD=FV=WSD9p61ePKXVOcUBGktRJkUx+KbiJXF-9QUtWE8zDt0A@mail.gmail.com>
Date: Fri, 25 Oct 2024 09:35:23 -0700
From: Doug Anderson <dianders@...omium.org>
To: Shawn Sung (宋孝謙) <Shawn.Sung@...iatek.com>
Cc: "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, 
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	Bibby Hsieh (謝濟遠) <Bibby.Hsieh@...iatek.com>, 
	Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>, 
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>, "djkurtz@...omium.org" <djkurtz@...omium.org>, 
	Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>, 
	"daniel@...ll.ch" <daniel@...ll.ch>, "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>, 
	CK Hu (胡俊光) <ck.hu@...iatek.com>, 
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>, "airlied@...il.com" <airlied@...il.com>, 
	YT Shen (沈岳霆) <Yt.Shen@...iatek.com>, 
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>, "littlecvr@...omium.org" <littlecvr@...omium.org>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
	Hsin-Yi Wang <hsinyi@...omium.org>, "zwisler@...omium.org" <zwisler@...omium.org>
Subject: Re: [PATCH v3 08/14] drm/mediatek: Add DRM_MODE_ROTATE_0 to rotation property

Hi Shawn,

On Thu, Oct 24, 2024 at 6:32 PM Shawn Sung (宋孝謙)
<Shawn.Sung@...iatek.com> wrote:
>
> Hi Doug,
>
> On Thu, 2024-10-24 at 13:47 -0700, Doug Anderson wrote:
> >
> > External email : Please do not click links or open attachments until
> > you have verified the sender or the content.
> >  Hi,
> >
> > On Wed, Jun 19, 2024 at 9:39 AM Hsiao Chien Sung via B4 Relay
> > <devnull+shawn.sung.mediatek.com@...nel.org> wrote:
> > >
> > > From: Hsiao Chien Sung <shawn.sung@...iatek.com>
> > >
> > > Always add DRM_MODE_ROTATE_0 to rotation property to meet
> > > IGT's (Intel GPU Tools) requirement.
> > >
> > > Reviewed-by: CK Hu <ck.hu@...iatek.com>
> > > Reviewed-by: AngeloGioacchino Del Regno <
> > angelogioacchino.delregno@...labora.com>
> > > Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC
> > MT8173.")
> > > Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
> > > ---
> > >  drivers/gpu/drm/mediatek/mtk_ddp_comp.h |  6 +++++-
> > >  drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 17 +++++------------
> > >  drivers/gpu/drm/mediatek/mtk_plane.c    |  2 +-
> > >  3 files changed, 11 insertions(+), 14 deletions(-)
> >
> > FWIW, this patch got into ChromeOS's 5.15 branch via stable merge and
> > apparently broke things. As a short term fix we've reverted it there:
> >
> > https://crrev.com/c/5960799
>
> Thank you for reporting this issue. We are currently investigating the
> bug.
>
> Since I am unable to access the Google issue tracker [1], could you
> please provide more details about this bug? The message in the revert
> commit mentions "hana/sycamore360" (MT8173) and it appears that there
> is a rotation issue in tablet mode.

Thanks for the followup. I've only been peripherally involved in the
problem, but I can at least copy the relevant bits over.

It looks as if the problem is somehow only showing up when running
Android apps on those devices, so whatever the problem is it's subtle.
The report says that the apps work OK when the device is in tablet
mode and in one rotation but the problem shows up when rotated 90
degrees. The report says that "Screen content appears inverted". To me
it also sounds _possible_ that the problem is somewhere in our
userspace.

I think Hsin-Yi and Ross are continuing to dig a bit more. Maybe once
they've dug they can add any details they find or can loop in others
as it makes sense?


> > ...apparently the patch is fine on newer kernels so maybe there is a
> > missing dependency? Hopefully someone on this list can dig into this
> > and either post the revert to stable 5.15 kernels or suggest
> > additional backports.
> >
>
> There are known issues [2] regarding forward compatibility. Could you
> confirm whether this patch is unable to resolve the mentioned problem?
> Thanks.
>
> [1] https://issuetracker.google.com/issues/369688659
> [2]
> https://patchwork.kernel.org/project/linux-mediatek/list/?series=896964

The patches in [2] look related to alpha blending but I think they are
seeing issues related to rotation. ...so I'm going to assume it's
different? I don't have this hardware in front of me, so I'm just
going by the report.

-Doug