linux-kernel - Re: [RFC 1/2] mmc: sdhci-msm: Add support for bus bandwidth voting

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Message-ID: <616c7a8c-a1cf-2043-4ea4-f452ee90f083@linaro.org>
Date:   Thu, 12 Sep 2019 15:56:08 +0300
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Pradeep P V K <ppvk@...eaurora.org>, adrian.hunter@...el.com,
        ulf.hansson@...aro.org, robh+dt@...nel.org
Cc:     asutoshd@...eaurora.org, vbadigan@...eaurora.org,
        stummala@...eaurora.org, sayalil@...eaurora.org,
        rampraka@...eaurora.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org,
        Subhash Jadavani <subhashj@...eaurora.org>,
        Andy Gross <agross@...nel.org>
Subject: Re: [RFC 1/2] mmc: sdhci-msm: Add support for bus bandwidth voting

Hi Pradeep,

Thanks for the patch!

On 9/6/19 15:47, Pradeep P V K wrote:
> Vote for the MSM bus bandwidth required by SDHC driver
> based on the clock frequency and bus width of the card.
> Otherwise,the system clocks may run at minimum clock speed
> and thus affecting the performance.
> 
> This change is based on Georgi Djakov [RFC]
> (https://lkml.org/lkml/2018/10/11/499)

I am just wondering whether do we really need to predefine the bandwidth values
in DT? Can't we use the computations from the above patch or is there any
problem with that approach?

Thanks,
Georgi