linux-kernel - Re: [PATCH 5/5] i2c: geni: sdm845: dont perform DMA for OnePlus 6 devices

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Message-ID: <X8fChCDbfLfdNoZL@builder.lan>
Date:   Wed, 2 Dec 2020 10:36:20 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Wolfram Sang <wsa@...nel.org>, Caleb Connolly <caleb@...nolly.tech>
Cc:     linux-arm-msm@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Akash Asthana <akashast@...eaurora.org>,
        Mukesh Savaliya <msavaliy@...eaurora.org>,
        phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] i2c: geni: sdm845: dont perform DMA for OnePlus 6
 devices

On Wed 02 Dec 09:39 CST 2020, Wolfram Sang wrote:

> 
> > >> -	if (!of_machine_is_compatible("lenovo,yoga-c630"))
> > >> +	if (!of_machine_is_compatible("lenovo,yoga-c630") &&
> > >> +	    !of_machine_is_compatible("oneplus,oneplus6"))
> > > This hack seems to have been working around two separate issues. First
> > > with iommu active the GENI wrappers needs to have their stream mapping
> > > configured. Secondly there was a bug in the transaction setup that was
> > > recently fixed by Doug Anderson.
> > >
> > > So can you please give the following patch a go? I've yet to test it on
> > > the Lenovo machine, but I think it allows us to remove the quirk.
> > >
> > > https://lore.kernel.org/lkml/20201122034149.626045-1-bjorn.andersson@linaro.org/T/#u
> 
> Please don't top-post. I fixed it this time.
> 
> > It looks like I still have the same issue even with this patch applied.
> 
> So we still need your patch, am I reading correctly?
> 

With Doug's recent fixes in the DMA handling and the introduction of
proper iommu configuration, which Caleb tested [1], I think we're good
without this on the OnePlus. Caleb, please confirm.

If I understood Caleb's report he saw exactly the same problem that Lee
Jones did that lead to the workaround for the Lenovo Yoga C630, and with
the two changes the i2c-hid keyboard came up nicely on my Yoga. So I
posted [2].

[1] https://lore.kernel.org/linux-arm-msm/3ba39a64-122b-ebe9-04b3-3a23478334a4@connolly.tech/
[2] https://lore.kernel.org/linux-arm-msm/20201124185743.401946-1-bjorn.andersson@linaro.org/

Regards,
Bjorn