linux-kernel - Re: [PATCH v2 1/2] dt-bindings: synopsys-dw-mshc-common: add "fifo-access-32bit" property

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Message-ID: <98f28de3-20b6-dd57-0c95-69c31f8bb76c@linaro.org>
Date:   Sun, 12 Mar 2023 12:13:07 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sergey Lisov <sleirsgoevy@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jaehoon Chung <jh80.chung@...sung.com>
Cc:     linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: synopsys-dw-mshc-common: add
 "fifo-access-32bit" property

On 12/03/2023 12:00, Sergey Lisov wrote:
>> On 12/03/2023 11:49, Sergey Lisov wrote:
>>>>
>>>> Anyway, I said last time this looks compatible-specific, so I don't
>>>> think we need another property.
>>>>
>>>> Best regards,
>>>> Krzysztof
>>>
>>> I agree, but I'm afraid of introducing regressions by enabling this
>>> workaround on systems that don't actually need it.
>>
>> I don't understand why would you enable it for systems which do not need it?
> 
> OK, then how do I find out which boards have the bug? My only idea is
> "search for samsung,exynos7-dw-mshc through all devicetrees, find vendor
> kernels for each of those boards, and check if they have the workaround".
> Is it really that better than enabling it selectively only for
> known-affected boards?

There is no way this is board specific. This is SoC specific. I
mentioned it last time.

Best regards,
Krzysztof