linux-kernel - Re: [Patch v3 10/11] memory: tegra: handle no BWMGR MRQ support in BPMP

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Date:   Thu, 23 Mar 2023 11:02:39 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Sumit Gupta <sumitg@...dia.com>
Cc:     treding@...dia.com, dmitry.osipenko@...labora.com,
        viresh.kumar@...aro.org, rafael@...nel.org, jonathanh@...dia.com,
        robh+dt@...nel.org, lpieralisi@...nel.org,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-pci@...r.kernel.org, mmaddireddy@...dia.com, kw@...ux.com,
        bhelgaas@...gle.com, vidyas@...dia.com, sanjayc@...dia.com,
        ksitaraman@...dia.com, ishah@...dia.com, bbasu@...dia.com
Subject: Re: [Patch v3 10/11] memory: tegra: handle no BWMGR MRQ support in
 BPMP

On Thu, Mar 23, 2023 at 10:58:18AM +0100, Krzysztof Kozlowski wrote:
> On 23/03/2023 10:55, Thierry Reding wrote:
> > On Wed, Mar 22, 2023 at 06:50:23PM +0100, Krzysztof Kozlowski wrote:
> >> On 20/03/2023 19:24, Sumit Gupta wrote:
> >>> If BPMP-FW doesn't support 'MRQ_BWMGR_INT', then the MC Client driver
> >>> probe fails with 'EPROBE_DEFER' which it receives on calling the func
> >>> 'devm_of_icc_get()'. Fix this by initializing the ICC even if the MRQ
> >>> is missing and return 'EINVAL' from 'icc_set_bw()' instead of passing
> >>> the request to BPMP-FW later when the BW request is made by client.
> >>>
> >>> Fixes: ("memory: tegra: add interconnect support for DRAM scaling in Tegra234")
> >>
> >> That's not correct tag.
> >>
> >> Anyway, send fixes separately.
> > 
> > I think this was a bit confusing. This fixes an issue that was
> > introduced in a patch earlier in this series, so it's probably better to
> > squash it into that patch rather than have a separate fix patch in the
> > same series.
> > 
> 
> Yeah, it is quite confusing to send buggy code and immediately fix it...
> Introducing known bugs is actually non-bisectable and harming.

I don't think this was done purposefully but rather as a way of more
clearly showing what was changed. This is also an issue that can only
happen on certain boards, so it's easy to miss.

But yeah, this is bad for bisectibility.

Sumit, please merge this into the patch that you reference in the Fixes:
tag along with the fix in patch 11.

Thierry

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