From: Wolfram Sang <wsa@the-dreams•de>
To: Kewei Xu <kewei.xu@mediatek•com>,
matthias.bgg@gmail•com, robh+dt@kernel•org,
linux-i2c@vger•kernel.org, devicetree@vger•kernel.org,
linux-arm-kernel@lists•infradead.org,
linux-kernel@vger•kernel.org, linux-mediatek@lists•infradead.org,
srv_heupstream@mediatek•com, leilk.liu@mediatek•com,
qii.wang@mediatek•com, liguo.zhang@mediatek•com,
caiyu.chen@mediatek•com, ot_daolong.zhu@mediatek•com,
yuhan.wei@mediatek•com
Subject: Re: [PATCH v7 6/7] i2c: mediatek: Isolate speed setting via dts for special devices
Date: Mon, 29 Nov 2021 13:49:05 +0100 [thread overview]
Message-ID: <YaTMQQhENmJAIUk4@kunai> (raw)
In-Reply-To: <YWQYbaTIhud2QHNP@kunai>
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> > stretching. But if the slave device stretch the SCL line for too long
> > time, our design still cannot make tSU,STA/tHD,STA/tSU,STO meet spec.
>
> Isn't the new algorithm broken if it cannot support clock stretching?
> What was the problem of the old algorithm not meeting the spec?
>
> > However in the old (default) timing algorithm before the commit
> > be5ce0e97cc7 ("i2c: mediatek: Add i2c ac-timing adjust support"),
> > tSU,STA/tHD,STA/tSU,STO can meet spec. So we want to define a new
> > setting "default-adjust-timing" for using the old (default) timing
> > algorithm."
>
> What I still do not get: the old algorithm was able to handle clock
> stretching. Why can't you update the new one to handle clock stretching
> as well. I might be missing something, but what is it?
I am still interested. Especially in the last question. Is the last
question clear to you? I can explain some more otherwise.
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next prev parent reply other threads:[~2021-11-29 12:50 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-17 10:14 [PATCH v7 0/7] Introducing an attribute to select the time setting Kewei Xu
2021-09-17 10:14 ` [PATCH v7 1/7] i2c: mediatek: fixing the incorrect register offset Kewei Xu
2021-10-02 6:28 ` Wolfram Sang
2021-09-17 10:14 ` [PATCH v7 2/7] i2c: mediatek: Reset the handshake signal between i2c and dma Kewei Xu
2021-10-02 6:30 ` Wolfram Sang
2021-10-08 6:19 ` Kewei Xu
2021-09-17 10:14 ` [PATCH v7 3/7] i2c: mediatek: Dump i2c/dma register when a timeout occurs Kewei Xu
2021-10-02 6:37 ` Wolfram Sang
2021-10-08 7:13 ` Kewei Xu
2021-09-17 10:14 ` [PATCH v7 4/7] dt-bindings: i2c: add attribute use-default-timing Kewei Xu
2021-09-17 10:14 ` [PATCH v7 5/7] i2c: mediatek: Add OFFSET_EXT_CONF setting back Kewei Xu
2021-10-02 6:40 ` Wolfram Sang
2021-09-17 10:14 ` [PATCH v7 6/7] i2c: mediatek: Isolate speed setting via dts for special devices Kewei Xu
2021-10-02 6:40 ` Wolfram Sang
2021-10-08 8:47 ` Kewei Xu
2021-10-11 10:56 ` Wolfram Sang
2021-11-29 12:49 ` Wolfram Sang [this message]
2021-12-18 9:44 ` Kewei Xu
2021-12-18 10:17 ` Wolfram Sang
2021-09-17 10:14 ` [PATCH v7 7/7] i2c: mediatek: modify bus speed calculation formula Kewei Xu
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