linux-kernel - Re: [PATCH 1/2] clk: mediatek: mt8365: fix the clock indexes

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Message-ID: <14694246-f09f-cebb-fadf-2d97719cc81b@linaro.org>
Date:   Wed, 17 May 2023 11:55:57 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Alexandre Mergnat <amergnat@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Chen-Yu Tsai <wenst@...omium.org>
Cc:     Markus Schneider-Pargmann <msp@...libre.com>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 1/2] clk: mediatek: mt8365: fix the clock indexes

On 17/05/2023 11:34, Alexandre Mergnat wrote:
> On 17/05/2023 10:40, Krzysztof Kozlowski wrote:
>> On 17/05/2023 10:28, Alexandre Mergnat wrote:
>>> Before the patch [1], the clock probe was done directly in the
>>> clk-mt8365 driver. In this probe function, the array which stores the
>>> data clocks is sized using the higher defined numbers (*_NR_CLOCK) in
>>> the clock lists [2]. Currently, with the patch [1], the specific
>>> clk-mt8365 probe function is replaced by the mtk generic one [3], which
>>> size the clock data array by adding all the clock descriptor array size
>>> provided by the clk-mt8365 driver.
>>>
>>> Actually, all clock indexes come from the header file [2], that mean, if
>>> there are more clock (then more index) in the header file [2] than the
>>> number of clock declared in the clock descriptor arrays (which is the
>>> case currently), the clock data array will be undersized and then the
>>> generic probe function will overflow when it will try to write in
>>> "clk_data[CLK_INDEX]". Actually, instead of crashing at boot, the probe
>>> function returns an error in the log which looks like:
>>> "of_clk_hw_onecell_get: invalid index 135", then this clock isn't
>>> enabled.
>>
>> Please use subject prefixes matching the subsystem. You can get them for
>> example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
>> your patch is touching.
> 
> I will.
> 
>>
>> This is huge ABI break and I don't understand why it is needed. Entire
>> description above did not explain me that.
> 
> Briefly, clocks with the higher index than the data clock array can't be 
> used. I've this issue:
> [    0.427054] of_clk_hw_onecell_get: invalid index 135
> [    0.429525] of_clk_hw_onecell_get: invalid index 69
> [    0.442998] of_clk_hw_onecell_get: invalid index 70
> 
> That means CLK_TOP_SSUSB_PHY_CK_EN, CLK_IFR_SSUSB_REF and 
> CLK_IFR_SSUSB_XHCI aren't working when I need them. So my USB doesn't work.

That sounds like a driver, not bindings problem.

Best regards,
Krzysztof