linux-kernel - Re: [PATCH v9 03/13] media: hantro: Use syscon instead of 'ctrl' register

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: <43a767f8-77f5-7937-c484-753a3123f6a2@xs4all.nl>
Date:   Tue, 20 Apr 2021 11:16:35 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Lucas Stach <l.stach@...gutronix.de>, ezequiel@...labora.com,
        p.zabel@...gutronix.de, mchehab@...nel.org, robh+dt@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com,
        lee.jones@...aro.org, gregkh@...uxfoundation.org,
        mripard@...nel.org, paul.kocialkowski@...tlin.com, wens@...e.org,
        jernej.skrabec@...l.net, emil.l.velikov@...il.com,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        Jacky Bai <ping.bai@....com>
Cc:     devel@...verdev.osuosl.org, devicetree@...r.kernel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-imx@....com,
        kernel@...gutronix.de, kernel@...labora.com, cphealy@...il.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v9 03/13] media: hantro: Use syscon instead of 'ctrl'
 register

On 20/04/2021 11:10, Benjamin Gaignard wrote:
> 
> Le 16/04/2021 à 17:14, Lucas Stach a écrit :
>> Am Freitag, dem 16.04.2021 um 15:08 +0200 schrieb Benjamin Gaignard:
>>> Le 16/04/2021 à 12:54, Lucas Stach a écrit :
>>>> Am Mittwoch, dem 07.04.2021 um 09:35 +0200 schrieb Benjamin Gaignard:
>>>>> In order to be able to share the control hardware block between
>>>>> VPUs use a syscon instead a ioremap it in the driver.
>>>>> To keep the compatibility with older DT if 'nxp,imx8mq-vpu-ctrl'
>>>>> phandle is not found look at 'ctrl' reg-name.
>>>>> With the method it becomes useless to provide a list of register
>>>>> names so remove it.
>>>> Sorry for putting a spoke in the wheel after many iterations of the
>>>> series.
>>>>
>>>> We just discussed a way forward on how to handle the clocks and resets
>>>> provided by the blkctl block on i.MX8MM and later and it seems there is
>>>> a consensus on trying to provide virtual power domains from a blkctl
>>>> driver, controlling clocks and resets for the devices in the power
>>>> domain. I would like to avoid introducing yet another way of handling
>>>> the blkctl and thus would like to align the i.MX8MQ VPU blkctl with
>>>> what we are planning to do on the later chip generations.
>>>>
>>>> CC'ing Jacky Bai and Peng Fan from NXP, as they were going to give this
>>>> virtual power domain thing a shot.
>>> That could replace the 3 first patches and Dt patche of this series
>>> but that will not impact the hevc part, so I wonder if pure hevc patches
>>> could be merged anyway ?
>>> They are reviewed and don't depend of how the ctrl block is managed.
>> I'm not really in a position to give any informed opinion about that
>> hvec patches, as I only skimmed them, but I don't see any reason to
>> delay patches 04-11 from this series until the i.MX8M platform issues
>> are sorted. AFAICS those things are totally orthogonal.
> 
> Hi Hans,
> What do you think about this proposal to split this series ?
> Get hevc part merged could allow me to continue to add features
> like scaling lists, compressed reference buffers and 10-bit supports.

Makes sense to me!

Regards,

	Hans