From: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
To: Hans Verkuil <hverkuil@xs4all.nl>
Cc: "houlong wei" <houlong.wei@mediatek.com>,
"Eizan Miyamoto" <eizan@chromium.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"chunkuang.hu@kernel.org" <chunkuang.hu@kernel.org>,
"Yong Wu (吴勇)" <Yong.Wu@mediatek.com>,
"wenst@chromium.org" <wenst@chromium.org>,
"CK Hu (胡俊光)" <ck.hu@mediatek.com>,
"Enric Balletbo i Serra" <enric.balletbo@collabora.com>,
"Yongqiang Niu (牛永强)" <yongqiang.niu@mediatek.com>,
"Andrew-CT Chen (陳智迪)" <Andrew-CT.Chen@mediatek.com>,
"Matthias Brugger" <matthias.bgg@gmail.com>,
"Mauro Carvalho Chehab" <mchehab@kernel.org>,
"Minghsiu Tsai (蔡明修)" <Minghsiu.Tsai@mediatek.com>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-media <linux-media@vger.kernel.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@lists.infradead.org>
Subject: Re: [PATCH v7 2/7] mtk-mdp: add driver to probe mdp components
Date: Tue, 7 Dec 2021 09:46:44 -0300 [thread overview]
Message-ID: <CAAEAJfDOU+tCjm=B8Mg0esZf=e99MM1cv+8SUN6sCBKq0hVvZw@mail.gmail.com> (raw)
In-Reply-To: <a0b3a10d-9313-7ac5-692c-822aeff50858@xs4all.nl>
Hi everyone,
On Tue, 7 Dec 2021 at 09:37, Hans Verkuil <hverkuil@xs4all.nl> wrote:
>
> On 9/5/21 6:23 PM, houlong wei wrote:
> > Hi Ezequiel,
> >
> > Thank you for your attention to this series of patches. I answer partial of your questions below.
> > Regards,
> > Houlong
> >
> > On Sat, 2021-09-04 at 20:34 +0800, Ezequiel Garcia wrote:
> >> Hi Eizan,
> >>
> >> Sorry for seeing this series so late.
> >>
> >> On Wed, 25 Aug 2021 at 03:35, Eizan Miyamoto <eizan@chromium.org>
> >> wrote:
> >>>
> >>> Broadly, this patch (1) adds a driver for various MTK MDP
> >>> components to
> >>> go alongside the main MTK MDP driver, and (2) hooks them all
> >>> together
> >>> using the component framework.
> >>>
> >>> (1) Up until now, the MTK MDP driver controls 8 devices in the
> >>> device
> >>> tree on its own. When running tests for the hardware video decoder,
> >>> we
> >>> found that the iommus and LARBs were not being properly configured.
> >>
> >> Why were not being properly configured? What was the problem?
> >> Why not fixing that instead?
> >>
> >> Does this mean the driver is currently broken and unusable?
> >
> > This series of patches are supplements to another series, please refer
> > to
> > https://patchwork.kernel.org/project/linux-mediatek/list/?series=515129c
> > , which add device link between the mtk-iommu consumer and the mtk-larb
> > devices. Without that series of patches, the mtk-mdp driver can work
> > well so far.
> > But with that series, it seems the device link only can be established
> > for the device which is registered as a platform driver. That's why
> > Eizan adds this series of patches to make all mdp components to be
> > registered as platform drivers.
>
> Hold on, so this means that if that iommu device-link series is merged,
> then the mtk-mdp driver breaks? I posted a PR for that iommu series, but
> I've just withdrawn that PR until this issue is clarified.
>
> Is it only mtk-mdp that is affected by this iommu device-link series, or
> others as well?
>
Like I said before, I think it's a mistake to introduce the component
framework in V4L2. This whole idea looks like a hack to me.
If we merge this, then we validate using the component framework
as a way to avoid fixing things properly.
Regards,
Ezequiel
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-12-07 12:50 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-25 6:33 [PATCH v7 0/7] Refactor MTK MDP driver into core/components Eizan Miyamoto
2021-08-25 6:33 ` [PATCH v7 1/7] mtk-mdp: propagate errors from clock_on Eizan Miyamoto
2021-08-25 6:33 ` [PATCH v7 2/7] mtk-mdp: add driver to probe mdp components Eizan Miyamoto
2021-09-04 12:34 ` Ezequiel Garcia
2021-09-05 16:23 ` houlong wei
2021-09-05 16:39 ` houlong wei
2021-12-07 12:37 ` Hans Verkuil
2021-12-07 12:46 ` Ezequiel Garcia [this message]
2021-12-07 13:02 ` Hans Verkuil
2021-12-08 2:00 ` Yong Wu
2021-08-25 6:33 ` [PATCH v7 3/7] mtk-mdp: use pm_runtime in MDP component driver Eizan Miyamoto
2021-08-25 6:33 ` [PATCH v7 4/7] media: mtk-mdp: don't pm_run_time_get/put for master comp in clock_on Eizan Miyamoto
2021-08-25 6:33 ` [PATCH v7 5/7] mtk-mdp: make mdp driver to be loadable by platform_device_register*() Eizan Miyamoto
2021-08-25 8:18 ` houlong wei
2021-08-25 6:33 ` [PATCH v7 6/7] soc: mediatek: mmsys: instantiate mdp virtual device from mmsys Eizan Miyamoto
2021-08-25 6:33 ` [PATCH v7 7/7] media: mtk-mdp: use mdp-rdma0 alias to point to MDP master Eizan Miyamoto
2021-08-25 8:43 ` houlong wei
2021-08-25 9:07 ` Enric Balletbo i Serra
2021-08-25 15:18 ` houlong wei
2021-08-25 16:54 ` Enric Balletbo i Serra
2021-08-30 17:14 ` houlong wei
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAAEAJfDOU+tCjm=B8Mg0esZf=e99MM1cv+8SUN6sCBKq0hVvZw@mail.gmail.com' \
--to=ezequiel@vanguardiasur.com.ar \
--cc=Andrew-CT.Chen@mediatek.com \
--cc=Minghsiu.Tsai@mediatek.com \
--cc=Yong.Wu@mediatek.com \
--cc=chunkuang.hu@kernel.org \
--cc=ck.hu@mediatek.com \
--cc=eizan@chromium.org \
--cc=enric.balletbo@collabora.com \
--cc=houlong.wei@mediatek.com \
--cc=hverkuil@xs4all.nl \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=linux-mediatek@lists.infradead.org \
--cc=matthias.bgg@gmail.com \
--cc=mchehab@kernel.org \
--cc=wenst@chromium.org \
--cc=yongqiang.niu@mediatek.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).